Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Online Assessment
Unit 05 Atomic Structure
Section A – Multiple choice questions
1
Which of the following about ""H isotope is INCORRECT?
A Atoms contain protons and electrons in the nucleus.
B It does NOT have neutrons.
C This is an isotope of hydrogen.
D Its protons has a positive charge.
A
2
Which of the following combinations is correct?
Element
A
boron
B
potassium
C
sodium
D
iron
Symbol
B
P
S
I
A
3.
Which of the following statements about the non-metals is INCORRECT?
A Sulphur melts when heated.
B Bromine is a liquid at room temperature and pressure.
C Diamond cannot conduct electricity
D Chlorine is a good conductor of heat.
D
4.
Which of the following statements about the metals are correct?
(1) Copper is a good conductor of heat.
(2) Mercury can conduct electricity.
(3) Magnesium is shiny silvery.
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
D
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Online assessment
Topic 2
5.
Microscopic World I
Mastering Chemistry
Consider the following information of four atoms:
Atom
Mass number
Number of electrons
W
12
6
X
13
6
Y
27
13
Z
28
14
Which of the following atoms are isotopes?
A W and X
B W and Y
C X and Z
D Y and Z
A
6.
Consider the following information of four atoms:
Atom
Mass number
Number of neutrons
W
63
34
X
64
34
Y
65
36
Z
66
36
Which of the following atoms are isotopes?
(1) W and X
(2) W and Y
(3) Y and Z
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
B
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Online assessment
Topic 2
7.
Microscopic World I
Mastering Chemistry
Which of the following statements about subatomic particles is / are correct?
(1) Protons and neutrons have the same magnitude but opposite charge.
(2) Electrons are fast moving around the nucleus.
(3) A nucleus is very small compared with an atom.
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
D
8.
Consider the following statements and choose the best answer:
1st statement
2nd statement
35
37
Chlorine with Cl and Cl have the same
Isotopes of an element have the same
chemical properties.
electronic arrangement.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
A
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Section B – Short questions
9
The diagram below represents the structure of an atom of isotope A of an element.
a)
Particle
Complete the following table
Name of particle
Relative mass
Relative charge
X
Proton
1
+1
Y
Neutron
1
0
Z
Electron
1
1840
-1
(5 marks)
(spelling of ‘proton’, ‘neutron’, ‘electron’, 1 mark each)
(two numerical answers of each row, 1 mark)
b)
What is the name of element of this isotope?
Lithium
[Correct spelling is required]
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Online assessment
Topic 2
10
a)
Microscopic World I
Mastering Chemistry
Complete the following table.
Atom
Atomic
number
Mass
number
Name of
the element
Number of
neutrons
Electronic
configuration
W
9
19
fluorine
10
2.7
X
18
40
argon
22
2,8,8
Y
19
40
potassium
21
2,8,8,1
Z
13
27
aluminium
14
2,8,3
(8 marks)
(spelling of ‘fluorine’, ‘argon’, ‘potassium’, ‘aluminium’ 1 mark each)
(two numerical answers of each row, 1 mark)
b)
An atom is electrically neutral. Explain why.
(1 mark)
It has the same number of protons as electrons.
c)
(1)
Are X and Y are a pair of isotopes? Explain your answer.
(1 mark)
No, isotope should have the same number of protons and different number of neutrons.
(1)
[The answer should include ‘No’ and 1 property which isotope the same and 1 property
which is different]
[Accept the same ‘number of protons’, ‘element’, ‘atomic number’]
[Accept the different ‘number of neutrons’, ‘mass number’]
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Topic 2
11
Microscopic World I
Mastering Chemistry
The relative atomic mass of copper is 63.5.
A sample of copper contains the isotopes 63Cu and 65Cu.
Calculate the percentage abundance of each isotope in the sample.
(1 mark)
Percentage abundance of Cu = 75%
[Give mark to numerical answer only. Steps are not required]
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Online Assessment
Unit 06 The Periodic Table
Section A – Multiple choice questions
1.
In the periodic table, elements are arranged in order of increasing
A number of protons.
B number of neutrons.
C relative atomic mass.
D number of outermost shell electrons.
A
2
The electron diagram of an atom of element X in Period 3 is shown below.
(Only electrons in the outermost shells are shown.)
X belongs to the same group as
A helium.
B lithium.
C beryllium.
D boron.
C
3
Which of the following statements about Group I elements is correct?
A They are form acidic solution after reacted with water.
B They should be stored in water.
C They all have high density.
D They all have low melting points.
D
4
Which of the following statements about halogens is correct?
A All halogens can react with sodium sulphite solution..
B All halogens are gas at room temperature and pressure.
C All halogens have colour.
D The melting points of halogens decrease down the group.
A
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Online assessment
Topic 2
5
Microscopic World I
Mastering Chemistry
Which of the following atoms has an octet structure?
A Hydrogen atom
B Helium atom
C Oxygen atom
D Xenon atom
D
6
Which of the following gases can be used in advertising signs?
A Hydrogen
B Nitrogen
C Oxygen
D Neon
D
7
Which of the following particles have an octet structure in the outermost shells?
(1) Li+
(2) F−
(3) Br−
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
C
8.
Consider the following statements and choose the best answer:
1st statement
2nd statement
Boron atoms and silicon atoms have the same Boron and silicon are metalloids.
outermost shell electrons.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
C
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Section B – Short questions
9
A part of the periodic table is shown below:
a)
Across a period, the elements demonstrate a gradual change in some of their physical
properties. State ONE such property.
(1 mark)
Any one of the following:
• Across a period, the elements show a gradual change (increase) in non-metallic
character.
(1)
[Accept ‘from metal to non-metal’ or ‘from metal. metalloid to non-metal’]
• Across a period, the elements show a gradual change (decrease) in atomic size.
(1)
[Accept ‘atomic radius’ or ‘atomic size’]
b)
i)
Write the electronic arrangement of magnesium atom and calcium atom.
Magnesium atom: 2,8,2
Calcium atom: 2,8,8,2
ii)
What is the similarity between the electronic arrangements of atoms of magnesium
and calcium so that they are classified to the same group?
(1 mark)
They both have 2 outermost shell electrons.
iii) What ise the difference between the electronic arrangements of atoms of
magnesium and calcium so that they are classified to different periods?
They both have different occupied electron shell.
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(1)
(1)
(1)
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Topic 2
c)
Microscopic World I
Mastering Chemistry
Which metal and non-metal in the above table would you expect to react most vigorously
with each other? Explain your reason.
(3 marks)
K and F / potassium and fluorine / K and F2 / F and K / fluorine and potassium / F2 and K
(1)
Reactivity of group I elements increases down the group.
(1)
Reactivity of group VII elements decreases down the group.
(1)
[1st mark for writing which TWO elements react most vigorously;
2nd mark for description of trend in reactivity of Group I elements;
3rd mark for description of trend in reactivity of Group VII elements;]
d)
Sodium and magnesium are added separately to cold water in troughs. State TWO
differences in the observations you expect.
(2 marks)
•
•
Sodium floats on the surface of water while magnesium sinks.
(1)
Sodium fizzes quickly / melts to form a silvery ball while magnesium shows no
reaction.
(1)
[Accept ‘Reaction of sodium is vigorous while reaction of magnesium is not observable /
too slow to observe.]
e)
Explain why argon does not react with any substances.
An argon atom has 8 outermost shell electrons.
[Accept ‘Number of outermost shell electrons in Ar atom is 8’]
10
Strontium (Sr) and magnesium (Mg) are elements in Group II of the periodic table.
a) What is the name commonly given to this group of elements?
Alkaline earth metals
[correct spelling is required]
b)
(1 mark)
(1)
(1 mark)
(1)
The atomic number of strontium is 38. The electronic arrangement of a strontium atom is
2,8,p,8,q.
i)
What are the values of p, q and r?
(1 mark)
p = 18
q=2
[both number must be correct to get this mark. Steps are not required]
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Topic 2
c)
Microscopic World I
i)
Mastering Chemistry
Write an observable change in the reaction of magnesium with dilute hydrochloric
acid?
(1 mark)
Any one of the following:
•Magnesium dissolves.
•Gas bubbles forms.
•The mixture becomes hot.
[Max 1]
ii)
Strontium also reacts with dilute hydrochloric acid. What is the difference in the
expected observation between the reaction of strontium and that of magnesium?
(1 mark)
Any one of the following:
• Strontium dissolves more fastly / strontium reacts more vigorously / magnesium
•
•
dissolves more slowly / magnesium reacts less vigourously.
Strontium forms gas bubbles more fastly / more vigorously.
Strontium use less time to become hot / magnesium use more time to become
hot.
[Observable change and difference are required]
[Max 1]
iii) How does a strontium atom change into a strontium ion during the reaction?
(1 mark)
Sr atom loss 2 electrons.
iv) Why strontium and magnesium have similar chemical properties? Explain in terms
of the electronic arrangement of their atoms.
(1 mark)
They have the same number of outermost shell electrons. / They both have 2
outermost shell electrons.
[Accept ‘same number of outermost shell electrons’ or ‘two outermost shell
electrons’. Other numbers are not accepted]
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Online Assessment
Unit 07 Ionic and Metallic Bonds
Section A – Multiple choice questions
1.
Which of the following pairs of elements will combine to form an ionic compound?
A Sodium and magnesium
B Iron and chlorine
C Oxygen and sulphur
D Argon and xenon
B
2.
Which of the following combinations is INCORRECT?
Chemical formula
A
NH4+
B
NO2−
C
SO32−
D
MnO4−
Name
ammonium ion
nitrate ion
sulphite ion
permanganate ion
B
3.
Which of the following compounds, when dissolved in water, gives a colourless solution?
A Iron(III) nitrate
B Zinc sulphate
C Sodium dichromate
D Copper(II) chloride
B
4.
How many different elements does aluminium nitrate contain?
A 2
B 3
C 4
D 5
B
5.
Which of the following statements about KMnO4 is INCORRECT?
A It consists of 6 elements.
B It gives a purple solution when dissolved in water.
C The potassium ion carries one positive charge.
D It is soluble in water.
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Topic 2
Microscopic World I
Mastering Chemistry
A
6.
Which of the following metals can form more than one kind of positive ion?
A Iron
B Aluminium
C Silicon
D Silver
A
7.
Which of the following are polyatomic ions?
(1) Carbonate ion
(2) Sulphide ion
(3) Dichromate ion
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
B
8.
Consider the following statements and choose the best answer:
1st statement
2nd statement
Boron atoms and silicon atoms have the same Boron and silicon are metalloids.
outermost shell electrons.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
C
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Section B – Short questions
9
Sodium combines with chlorine to form sodium chloride.
a) Describe, in terms of electron transfer, how a sodium atom and a chlorine atom react to
form particles in sodium chloride.
(1 mark)
Any one of the following:
• One electron is transferred from one sodium atom to one chlorine atom.
[Accept ‘1 Na atom gives / donates 1 e- to 1 Cl atom’]
b)
• Sodium atom lose 1 electron. Chlorine atom gain 1 electron.
(Max 1)
Write the electronic arrangement of sodium ion and chloride ion.
(2 marks)
Sodium ion: 2.8
Chloride ion: 2,8,8
c)
State the bonding between sodium ion and chloride ion.
ionic bonding / ionic bond
10
a)
Magnesium is a metal.
Suggest what bonding occurs between magnesium atoms.
Metallic bonding / metallic bond
b)
(1)
(1)
(1 mark)
(1)
(1 marks)
(1)
Magnesium can combine with nitrogen to form an ionic compound.
i) Write the electronic arrangement of magnesium atom and nitrogen atom. (2 marks)
Magnesium atom: 2,8,2
Nitrogen atom: 2,5
ii)
(1)
(1)
The formula of this compound is MgxNy. Write name of this compound and the
value of x and y.
(2 marks)
Name: Magnesium nitride
x: 3
y: 2
(Correct spelling of name, 1 mark; correct x and y, 1 mark)
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Online assessment
Topic 2
11
Microscopic World I
Mastering Chemistry
An experiment setup as follow:
a)
b)
What is the expected observation to the acid solution near electrode X? Explain your
answer.
(2 marks)
Solution remains colourless / no observable change,
[Accept ‘colourless solution moves / diffuse from the gel to solution near Y.’]
(1)
because colourless SO42- moves to positive electrode.
[Accept ‘sulphate ion is colourless.’]
[1st mark for remain colourless / no observable change]
[2nd mark for colour of ion]
(1)
What is the expected observation to the acid solution near electrode Y? Explain your
answer.
(2 marks)
Solution becomes green,
[Accept ‘green colour moves / diffuse from the gel to solution near Y.’]
because Ni2+ moves to negative electrode.
[Accept ‘positive nickel(II) ion moves towards negative electrode.’]
[1st mark for colour]
[2nd mark for charge of ion and electrode]
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Online assessment
Topic 2
12
Microscopic World I
Mastering Chemistry
The following diagram describe a model of potassium.
a)
Write down the electronic arrangement of potassium.
(1 mark)
2,8,8,1
b)
In this model, what are potassium consisted of?
(1)
(2 marks)
positive ion
and delocalised electrons
c)
(1)
(1)
If potassium is react with element with atomic number 8, what is the name of the
compound formed.
Potassium oxide
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Online Assessment
Unit 08 Covalent Bonds Quiz
Section I – Multiple choice questions
1.
Which of the following statements about chlorine is INCORRECT?
A It is toxic.
B It is a halogen.
C It exists as diatomic molecules.
D It is a covalent compound.
D
2.
X is an element in Period 2 of the periodic table. X can react with sodium to form a compound
with the chemical formula Na3X. Which of the following statements about X is INCORRECT?
A One atom of X forms a triple bond with another atom of X.
B X exists as diatomic molecules.
C X is toxic.
D X can form a compound with the chemical formula XH3.
C
3.
The electron diagram of a compound formed between elements X and Y is shown below:
(Only electrons in the outermost shells are shown.)
Which of the following combinations is correct?
A
B
C
D
X
phosphorus
oxygen
phosphorus
oxygen
Y
hydrogen
chlorine
chlorine
hydrogen
C
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Topic 2
4.
Microscopic World I
Mastering Chemistry
The electron diagram of the compound formed between elements X, Y and Z is shown below:
(Only electrons in the outermost shells are shown.)
To which group does element Y belongs to ?
A Group III
B Group IV
C Group V
D Group VI
B
5.
Which of the following bonding are present in iron(II) chloride?
(1) Ionic bond
(2) Covalent bond
(3) Metallic bond
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
A
6.
Which of the following statements about a sulphur dichloride molecule is correct?
(1) The atoms are linked by S-Cl bond.
(2) There are no lone pair of electrons on S atom.
(3) It consists of two elements.
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
B
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Topic 2
7.
Microscopic World I
Mastering Chemistry
Which of the following bonds exist in NH4+ Cl .
–
(1) Covalent bond
(2) Ionic bond
(3) Metallic bond
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
A
8.
Consider the following statements and choose the best answer:
1st statement
2nd statement
Boron atoms and silicon atoms have the same Boron and silicon are metalloids.
outermost shell electrons.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
C
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Section II – Short questions
9.
The non-metallic element Se is in Group VI of Periodic Table.
a) The electronic arrangement of Se is 2,8,x,y. What are the values of x and y?
x = 18
y=6
(Both values must be correct to get this mark)
b)
(1 mark)
(1)
A compound consists of molecules combined from hydrogen atoms and selenium atoms.
i) Predict the type of bonding present in this compound.
(1 mark)
Covalent bond / covalent bonding
ii)
Write the name of this compound.
hydrogen selenide
(1)
(1 mark)
(1)
iii) How many lone pairs of electrons does this molecule has? (1 mark)
2
iv) Calculate the molecular mass of hydrogen selenide.
(Relative atomic masses: H = 1.0; Se = 79.0)
81.0
[No need to write the steps]
10. a)
X is a compound combined from Ca and F.
i) Predict the type of compound (ionic or covalent) formed.
Ionic
ii)
State the name X and calculate its formula mass or molecular mass.
(Relative atomic masses: Ca = 40.1; F = 19.0)
Name: Calcium fluoride
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(1)
(1 mark)
(1)
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Topic 2
Microscopic World I
Mastering Chemistry
Formula mass / molecular mass: 78.1
iii) Describe how Ca atoms and F atoms to form X.
(1)
(1 mark)
1 Ca atom donates total 2 electrons to 2 F atoms.
(1)
[Accept ‘1 Ca atom loses 2 elctrons. 2 F atoms receive total 2 electrons’]
[Description must include Ca lose 2 electrons, and 2 F absorb total 2 electrons.]
b)
Y is a compound combined from H and F.
i) Predict the type of compound (ionic or covalent) formed.
Covalent
ii)
(1 mark)
(1)
State the chemical formula of Y and calculate its formula mass or molecular mass.
(Relative atomic masses: H = 1.0; F = 19.0)
(2 marks)
Name: Hydrogen fluoride
Formula mass / molecular mass: 20.0
iii) Describe how H atoms and F atoms to form X.
(1)
(1)
(1 mark)
1 H atom share 1 pair of outermost shell electrons with 1 F atom.
(1)
[The description should include number of atoms of each element and how many
outermost shell electrons are shared]
(1)
11. When H+ ions react with H2O molecules, H3O+ ions are formed.
a) Name the type of bond formed when H+ ions combine with H2O molecules. Explain how
this type of bond is formed in the H3O+ ion.
(2 marks)
Type of bond: Dative covalent bond
(1)
Explanation: The lone pair on the oxygen atom provides both the electrons for bonding
with the H+ ion.
(1)
[Accept ‘A lone pair electrons on the O atom becomes shared by O and H.’]
b)
State the total number of electrons shared by O atom with one H atom.
2
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c)
Microscopic World I
Mastering Chemistry
State the total number of lone pairs of electrons on O atom of H3O+ ion.
1
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Online Assessment
Unit 09 Relating the Properties of Substances to Structure and Bonding Quiz
Section A – Multiple choice questions
1.
Which of the following substances CANNOT conduct electricity?
A Molten potassium bromide
B Zinc chloride solution
C Solid iron(III) chloride
D Solid magnesium
C
2.
Which of the following substances has the highest boiling point?
A Aluminium oxide
B Fluorine dioxide
C Phosphorus
D Magnesium
A
3.
Which of the following statements about substances with giant covalent structures is
INCORRECT?
A These substances have high melting points.
B These substances are hard.
C These substances are INSOLUBLE in non-aqueous solvent.
D Atoms in these substances are held together by van der Waals’ forces.
D
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Topic 2
4.
Microscopic World I
Mastering Chemistry
Consider the properties of the following four substances:
Substance
Melting point (oC)
Solubility in water
W
16
soluble
X
842
insoluble
Y
1020
soluble
Z
3730
insoluble
Which of the following substances is likely to have a giant ionic structure?
A W
B X
C Y
D Z
C
5.
The atomic numbers of elements X and Y are 1 and 17 respectively. X and Y combine to form
compound Z. Which of the following statements about Z is / are correct?
(1) It has a giant ionic structure.
(2) Van der Waals’ forces hold its molecules together.
(3) It has a low boiling point.
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
D
6.
Which of the following pairs of substances is / are allotropes?
(1) Graphite and diamond
(2) Carbon dioxide gas and dry ice
(3) Bromine-79 and bromine-81
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
A
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Topic 2
7.
Microscopic World I
Mastering Chemistry
Which of the following statements about iodine are correct?
(1) Covalent bonds hold the atoms together.
(2) It CANNOT conduct electricity.
(3) It is very soluble in distilled water.
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
A
8.
Consider the following statements and choose the best answer:
1st statement
Ionic compounds are brittle.
A
B
C
D
2nd statement
Ionic compound are highly soluble in water.
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
B
Explanations
1 Solid iron(III) chloride does not have mobile ion, so it cannot conduct electricity.
2 Aluminium oxide is giant ionic, so it has highest boiling point.
3 In giant covalent substance, atoms are held together by covalent bonds.
4 Ionic compounds should have high melting point and is soluble in water.
5 Hydrogen choride is simple molecular.
6 Graphite and diamond are allotropes of carbon.
7 Iodine is insoluble in distilled water.
8 Ionic compounds are brittle because layer of ions slide over each other so that ions of the same
charge approach to each other.
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Section B – Short questions
9
a)
Compare the melting point of lithium and fluorine, and explain the difference in terms of
their structure and bonding.
(5 marks)
Lithium has a higher melting point, while fluorine has a lower melting point.
(1)
[Accept ‘Melting point of lithium is higher than fluorine’ or ‘Fluorine has a lower melting
point than lithium’]
Lithium is giant metallic / has a giant metallic structure.
(1)
[‘lithium’ and ‘giant metallic’ must be present must be present to get this mark]
Lithium atoms are held together by strong metallic bonds.
(1)
[The concept ‘metallic bonds between atoms are strong’ must be present]
Fluorine is simple molecular / has a simple molecular structure.
(1)
[‘fluorine’ and ‘simple molecular’ must be present must be present to get this mark]
Fluorine molecules are held together by weak van der Waals’ force.
(1)
[The concept ‘van der Waals’ force between molecules are weak’ must be present]
b)
Fluorine combines with lithium to form a compound X.
i) Write the name of compound X.
Lithium fluoride
ii)
(1 mark)
(1)
Comment the electrical conductivity of compound X in solid form and molten form.
(2 marks)
Lithium fluoride conducts electricity when molten because ions are mobile in molten
state.
(1)
[Accept ‘Molten lithium fluoride conducts electricity because it has mobile ions’]
Lithium fluoride does NOT conduct electricity when solid, because ions are NOT
mobile in solid state.
(1)
[Accept ‘Solid lithium fluoride not conducts electricity because it has no mobile
ions’]
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Online assessment
Topic 2
10
Microscopic World I
Mastering Chemistry
The diagram represents the structure of iron.
With reference to above diagram, explain
a) why iron has a high melting point;
(2 marks)
In iron, a ‘sea’ of delocalised electrons surrounds the regular three-dimensional
arrangement of positive metallic ions.
(1)
[Accept ‘iron consists of sea of delocalised electrons and lattice of positive ions]
The melting point of iron is high because the attractive forces between the metallic ions
and the electrons are strong.
(1)
[Accept ‘strong attraction of positive ions to delocalised electrons]
b)
why iron conducts electricity;
Delocalised electrons are mobile.
[Accept ‘delocalised electrons to delocalised electrons]
c)
why iron is malleable.
(1 mark)
(1)
(2 marks)
The layers of positively charged metallic ions slide over each other when the metal is
hammered.
(1)
[Accept ‘layer of positive ions slide each other’ or ‘sliding of plane of positive ion
occurs’]
New metallic bonds are re-formed.
(1)
[Accept ‘metallic bond form again’ or ‘attraction of positive ion and delocalized electrons
still occur’. Concept of ‘metallic bond still occur’ or ‘attractive force between positive
ions and delocalised electrons still here’ should be present]
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Online assessment
Topic 2
11
Microscopic World I
Mastering Chemistry
Consider the substances listed below:
helium, hydrogen sulphide, magnesium oxide, carbon dioxide, silicon dioxide
Diagrams (a), (b), (c) and (d) below show the arrangements of particles, which can be atoms,
ions or molecules, in some substances.
For each diagram, choose ONE substance from the above list, which has the arrangement of
particles as shown under room temperature and pressure.
(4 marks)
(a)
magnesium oxide (1)
(b)
silicon dioxide
(1)
helium
(1)
(c)
(d)
hydrogen sulphide (1)
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Online Assessment
Topic 02 Microscopic World I Quiz
Section A – Multiple choice questions
1.
Which of the following statements about nitrogen is INCORRECT?
A Its atom has 7 protons.
B The notation of nitrogen-14 is #$"N.
C Its atom has 5 outermost shell electrons.
D Two nitrogen atoms combined form a covalent compound.
D
2.
Deuterium and tritium are isotopes of hydrogen. Which of the following statements about
deuterium and tritium is correct?
A They have the same physical properties.
B They are the same element.
C They have the same relative isotopic mass.
D They have the same number of neutrons.
B
3
The electronic arrangement of an arsenic (Ar) atom is 2,8,18,5. Which of the following group
and period does arsenic belongs to?
Group
Period
A
III
6
B
IV
5
C
V
4
D
VI
3
C
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Online assessment
Topic 2
4
Microscopic World I
Mastering Chemistry
Caesium (Cs) is a Group I element. Which of the following statements about caesium is
INCORRECT?
A The melting point of caesium is higher than that of potasssium.
B Caesium is easily cut by a knife.
C Caesium does NOT react with paraffin oil.
D A bottle containing francium should bear the hazard warning labels shown below.
D
5
How many different elements does lithium carbonate consisted of?
A 2
B 3
C 4
D 5
B
6
Consider the following information about four elements:
Symbol
Element
of
Atomic number
W
X
Y
Z
11
13
15
17
Which of the following statements about W, X, Y and Z is INCORRECT?
A W can combine with Z to form a salt.
B X is an alkaline earth metal.
C Y is a solid at room temperature and pressure.
D Z is toxic.
B
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Online assessment
Topic 2
7.
Microscopic World I
Mastering Chemistry
The following diagram shows that substance X exists as monoatomic molecules at room
temperature and pressure:
Which of the following statements about gas X must be true?
A Its atom has 8 outermost shell electrons.
B It is a noble gas.
C It is coloured.
D Covalent bonds exist between atoms of X.
B
8.
Metal X is an element belonged to Period 3 and group II. Which of the following is an electron
diagram of the compound formed between X and fluorine?
(Only electrons in the outermost shells are shown.)
B
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Online assessment
Topic 2
9.
Microscopic World I
Mastering Chemistry
Consider the following information of four substances:
Substance
Melting points
(oC)
Solubility in
water
Electrical conductivity
in solid state
W
3560
insoluble
non-conducting
X
820
insoluble
conducting
Y
–75
soluble
non-conducting
Z
1030
soluble
non-conducting
Which of the following substances has a giant covalent structure?
A W
B X
C Y
D Z
A
10. Element X belongs to period 3 and group VI. Which of the following electron diagrams best
represents the compound formed between X and hydrogen?
(Only electrons in the outermost shells are shown.)
B
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
11. Which of the following diagrams correctly shows a polyatomic ion combined from N and H?
A
12. Which of the following bonds exist(s) in sodium nitrate?
(1) Ionic bond
(2) Metallic bond
(3) Covalent bond
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
D
13. Which of the following statements about sulphur and oxygen are correct?
(1) They belong to group VI of the periodic table.
(2) They combine to form a covalent compound.
(3) Their atoms have 6 occupied electron shells.
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
A
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
14. Graphene is an individual single layer of graphite. Its structure is shown below:
Which of the following statements about graphene is / are correct?
(1) It can be used as lubricant.
(2) It has a simple molecular structure.
(3) It can be easily peeled off from graphite.
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
C
15. Consider the following statements and choose the best answer:
1st statement
2nd statement
Permanganate ion has metallic bonding.
Permanganate ion contains a metal,
manganese.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
C
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Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Explanations:
1 Element of nitrogen consists of diatomic molecules.
2 Deuteruym and tritium are isotopes of hydrogen, so they are the same element.
3 Arsenic belongs to Group V and Period 4.
4 Melting point of group I element decrease down the group.
5 Lithium carbonate is combined from Lithium, carbon and oxygen. Total 3 elements.
6 Element with atomic number 12, not 13, is alkaline earth metal.
7 Only noble gas exists as monoatomic molecules.
8 Metal X is magnesium. Ratio of X and F should be 1:2.
9 Substance with giant covalent structure has high melting point and does not dissolve in any
solvent.
10 Element X is sulphur. Ratio of H and X should be 2:1.
11 N and H forms ammonium ion. One N atom uses its lone pair of electrons to share with 1 H
atom.
12 Attraction of sodium ion and nitrate ion is ionic bond. In nitrate ion, there is covalent bond.
13 Sulphur atoms have 6 outermost shell electrons, NOT 6 occupied electron shells.
14 Graphene has giant covalent structure.
15 Only metals, not ions, have metallic bonding.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Online assessment
Topic 2
Microscopic World I
Mastering Chemistry
Section B – Short questions
16
A sample of rubidium was analysed and found to consist of two isotopes, rubidium-85 and
rubidium-87. Their abundances are 72.15% and 27.85% respectively.
a) In terms of subatomic particles, what is the difference between these isotopes of
rubidium?
(1 mark)
They have the same number of protons, but different number of neutrons.
(1)
b)
Calculate the relative atomic mass of the sample of rubidium.
(1 mark)
85.56
(1)
[Give marks to numerical answer only. Steps are not required. Accept 85.6 or 85.557]
c)
Given rubidium-85 reacts explosively with ethanol. What is the observation when
rubidium-87 is added to ethanol. Explain your reasoning.
(1 mark)
Rubidium-87 reacts explosively with ethanol, because isotopes of the same element have
the same chemical properties.
(1)
[Following TWO should be included:
•
•
d)
Rubidium-87 reacts explosively with ethanol
‘isotope of the same element’, ‘chemical properties the same’]
Sodium also can react with ethanol. What is the difference in observation between with
the reaction of rubidium with ethanol and that of sodium with ethanol.
(1 mark)
The reaction of sodium with ethanol less vigorous, because reactivity of element increases
down group I
\
(1)
[Following TWO should be included:
•
•
e)
‘Sodium less vigorous’ or ‘rubidium more vigorous’
‘reactivity of group I elements increases down the group’]
Given that the electronic arrangement of rubidium is 2,8,18,x,y. Write the values of x and
y.
(1 mark)
x=8
y=1
(1)
[Give marks to numerical answer only. Both x and y must be correct to get this mark]
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Online assessment
Topic 2
17
Microscopic World I
Mastering Chemistry
f)
State how to prove rubidium is a metal experimentally.
(1 mark)
Test whether rubidium conduct electricity. Metals conduct electricity.
(1)
[Give marks to numerical answer only. Both x and y must be correct to get this mark]
a)
Ionic compound X consists of Al3+ and O2-.
i) Write the electronic arrangement of Al3+ ion and O2- ion.
Al3+:
2,8
O2-:
ii)
2,8
Write the name of compound X.
Aluminium oxide.
[Correct spelling is required]
iii) Calculate the formula mass of compound X.
(Relative atomic masses: O = 16.0, Al = 27.0)
102.0
[Give marks to numerical answer only. Steps are not required]
b)
(2 marks)
(1)
(1)
(1 mark)
(1)
(1 mark)
(1)
A triatomic molecule, Y, combined from C and O.
i) Write the name of this molecule.
Carbon dioxide
(1 mark)
(1)
ii)
(1 mark)
State the number of lone pair electrons on C atoms of this molecule.
0
[Give marks to numerical answer only. Steps are not required]
iii) Calculate the formula mass of this compound.
(Relative atomic masses: C = 14.0, O = 16.0)
44.0
[Give marks to numerical answer only. Steps are not required]
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1)
(1 mark)
(1)
Online assessment
Topic 2
18
Microscopic World I
Mastering Chemistry
The following table lists a group of elements.
a)
Symbol of element
Atomic number
F
7
Cl
17
Br
35
I
53
What is the name of the element with symbol ‘F’?
Fluorine
[Correct spelling is required]
b)
What is the name for the group of these elements?
Halogens
[Correct spelling is required]
c)
State the trend of boiling point of this group.
Boiling point of elements increases down group VII.
[Accept ‘boiling point increase down the group’]
d)
To which period of the periodic table does Cl belong? Explain your answer.
Period 3, because Cl atom has 3 occupied electron shells.
e)
(1)
(1 mark)
(1)
(1 mark)
(1)
(1 mark)
(1)
Solution of Br and I has colour. State a reagent (hints: an aqueous solution) that can
decolorise the solution of these elements.
(1 mark)
Sodium sulphite
f)
(1 mark)
(1)
Suggest the structure of a compound combined from sodium and one element of this
group.
(1 mark)
Giant ionic
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(1)
Online assessment
Topic 2
g)
Microscopic World I
Mastering Chemistry
Suggest the structure of a compound combined from carbon and one element of this
group.
(1 mark)
Simple molecular
19
Pure carbon can exist in two forms, diamond and graphite.
a) Write the electronic arrangement of a carbon atom.
2,6
(1)
(1 mark)
(1)
b)
A drill bit is used to cut holes through materials. The cutting end of this drill bit is covered
with very small diamonds.
What property of diamond makes it suitable for use on the cutting end of a drill bit?
Explain why diamond has this property, in terms of is structure and bonding. (3 marks)
Diamond is hard.
(1)
[‘hard’ is required for 1st mark ]
Diamond has a giant covalent structure.
(1)
[‘giant covalent structure’ is required for 2nd mark ]
Carbon atoms are held together by strong covalent bonds to form a network.
(1)
[The concept of ‘covalent bonds between carbon atoms are strong’ and ‘network’ is
required for 3rd mark ]
c)
Explain why graphite is a good conductor of electricity but diamond is NOT.
(3 marks)
In graphite, each carbon atom uses 3 of its outermost shell electrons to form covalent
bonds with other atoms of the same plane.
(1)
[The concept of ‘in graphite on an atomic plane, C atoms uses 3 outermost shell electrons
to form covalent bonds with other atoms’ required for 1st mark ]
The remaining 1 of its outermost shell electrons delocalises along the same plane. (1)
[The concept of ‘in graphite, on an atomic plane, 1 of the outermost shell electrons in
each C atom delocalises’ required for 2nd mark ]
In diamond, each carbon atom uses 4 of its outermost shell electrons to form covalent
bonds. No delocalised electrons are present.
(1)
[The concept of ‘in diamond, C atoms uses 4 outermost shell electrons to form covalent
bonds with other atoms’ and ‘have no delocalised electrons’ are required for 3rd mark ]
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Online assessment
Topic 2
Microscopic World I
20
In solid states, copper conduct electricity, but copper(II) chloride does not. When melted,
the both can conduct electricity.
Explain these observations.
a)
Mastering Chemistry
Copper has a giant metallic structure / is a metal.
(1)
[The words ‘copper is metal’, or ‘copper has giant metallic structure’ required for 1st
mark ]
No matter in solid or molten state, metal atoms has delocalised electrons.
(1)
[Accept ‘When solid or molten’, outermost shell electrons of copper atoms are
delocalised’ required for 2nd mark.
Copper(II) chloride has a giant ionic structure / is ionic compound.
(1)
[The words ‘copper(II) chloride is ionic’, or ‘copper(II) chloride has giant ionic structure’
required for 3rd mark]
In solid state, ions are not mobile. In molten state, ions are mobile.
(1)
[Concept ‘when solid, it has no mobile ions. When molten, it has mobile ions’ are
required for 4th mark.]
b)
Silicon dioxide (SiO2) melts at 2 230 °C. Silicon tetrachloride (SiCl4) melts at–70 °C.
Neither of the liquids formed conducts electricity.
Explain why they have different melting points, in terms of bonding and structure.
Silicon dioxide has a giant covalent structure.
(1)
[The words ‘silicon dioxide is giant covalent’ required for 1st mark ]
Silicon and oxygen atoms are held together by strong covalent bonds to form a network.
(1)
[The concept of ‘covalent bonds between atoms are strong’ and ‘network’ is required for
2nd mark ]
Silicon tetrachloride has a simple molecular structure / is simple molecular.
(1)
[The words ‘silicon tetrachloride is simple molecular’, or ‘silicon tetrachloride has simple
molecular structure’ required for 3rd mark]
Molecules are held together by weak van der Waals force.
(1)
[Concept ‘van der Waals force between molecules are weak’ are required for 4th mark.]
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 05 Atomic Structure Test
Question Book
Name:
Time allowed: 30 mins
Class:
Section I – Multiple choice questions
(
)
Marks:
/ 25
(8 marks)
1
The mass number and atomic number of an atom is 59 and 27 respectively. Which of the
following combinations about the atom is correct?
Number of protons
Number of neutrons
Number of electrons
A
27
27
32
B
27
32
27
C
32
27
32
D
32
32
27
2
An atom X has 15 protons and 16 neutrons. Which of the following electron diagrams is
correct?
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
3
Microscopic World I
Which of the following combinations is correct?
Element
A
Lithium
B
Tin
C
Copper
D
Iron
Mastering Chemistry
Symbol
Li
Ti
Co
Ir
4
An atom of element X has 7 protons and 7 neutrons. Which of the following statements about
element X is correct?
A X is a gas at room temperature and pressure.
B X can relight a glowing splint.
C The mass number of X is 7.
D The atom can be written as ""X.
5
Which of the following can conduct electricity at room temperature and pressure?
(1) Beryllium (Be)
(2) Chromium (Hg)
(3) Mercury (Hg)
A
B
C
D
6
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Which of the following statements about isotopes of an element is / are correct?
(1) They have the same chemical properties.
(2) They have the same physical properties.
(3) They have the same atomic number.
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
7
Mastering Chemistry
An atom of element X has an electronic arrangement of 2,8,18,7. Which of the following
statements about X is / are correct?
(1) It is a non-metal.
(2) Its atom has 35 protons.
(3) It is a solid at room temperature and pressure.
A
B
C
D
8.
Microscopic World I
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Consider the following statements and choose the best answer:
1st statement
Isotopes of an element have the physical
properties.
A
B
C
D
2nd statement
Isotopes of an element have the same atomic
number.
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 05 Atomic Structure Test
Answer Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
/ 25
Section I – Multiple choice questions
(8 marks)
1
2
3
6
7
8
4
5
Section II – Short questions
9
i)
(17 marks)
Complete the following table.
(4 marks)
Atom
Atomic
number
Mass
number
W
9
19
Number of
protons
X
Y
Z
ii)
22
Number of
electrons
20
20
10
17
Draw the electron diagram of atom W, X, Y and Z.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Number of
neutrons
20
(4 marks)
Continuous
assessment
Topic 2
10
Microscopic World I
Element X has two isotopes:
each isotope.
Mastering Chemistry
%&
$𝑋
and
%%
$𝑋 .
The table below shows the relative abundance of
Isotope
Relative abundance (%)
10
5
𝑋
80.0
11
5
𝑋
20.0
What is the meaning of ‘isotope’?
(2 marks)
b)
Calculate the relative atomic mass of element X.
(2 marks)
c)
What is the name of element X?
(1 mark)
d)
Draw an electron diagram of an atom of X.
(1 mark)
e)
Element X is a non-metal. How do you tell whether an element is a metal or non-metal by
an experiment.
(1 mark)
f)
Element X with pure isotope 10X forms a compound 10XCl3. This compound releases misty
fumes in water.
Suggest what happens when another compound 11XCl3 is added to water. Explain your
answer.
(2 marks)
END
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Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 05 Atomic Structure Test
Suggested Answers
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
/ 25
Section I – Multiple choice questions
(8 marks)
1
B
2
B
3
A
6
C
7
D
8
C
4
A
5
D
Section II – Short questions
9
(17 marks)
a)
Atom
Atomic
number
Mass
number
Number of
protons
Number of
neutrons
Number of
electrons
W
9
19
9
10
9
X
20
40
20
20
20
Y
10
22
10
12
10
Z
17
37
17
20
17
(4)
(4 marks for all correct, 1 mark for each correct row)
b)
W
X
(4 marks for all correct, 1 mark for each)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Y
Z
Continuous
assessment
Topic 2
Microscopic World I
17
Atoms of an element having the same number of protons
but different number of neutrons.
a)
Mastering Chemistry
(1)
(1)
b)
10 × 80 + 11 × 20
100
c)
= 10.8
(1)
(1)
Boron
(1)
d)
(1)
e)
Measure the electrical conductivity. Metal conducts electricity, but nob-metal does not. (1)
f)
11
XCl3 releases fumes in water.
Isotopes have the same physical properties.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1)
(1)
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 6 The Periodic Table Test
Question Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
/ 25
(8 marks)
1
Which of the following statements about Group II elements is INCORRECT?
A They sinks in water.
B They are soft compared with iron.
C They can react with oxygen to form oxide.
D They must be stored in oil.
2
Which of the following statements about potassium is INCORRECT?
A It is explosive.
B It is a solid at room temperature and pressure.
C It is lower density than calcium.
D It reacts with chlorine to form salt.
3
Which of the following statements about periods in the periodic table is / are correct?
(1) Carbon is in the second period of the periodic table.
(2) Oxygen has 6 electrons.
(3) Across the second period of the periodic table, the elements show a gradual decrease in
melting point.
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
4
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Which of the following statements about Group 0 elements are correct?
(1) They are unreactive to all metals.
(2) They are all colourless.
(3) All their atoms have 8 electrons in the outermost shell.
A
B
C
D
6
Mastering Chemistry
Caesium (Cs) is a Group I element. Which of the following statements about caesium are
correct?
(1) Its melting point is lower than that of sodium.
(2) It reacts with cold water to give an alkaline solution.
(3) It is more reactive than sodium.
A
B
C
D
5
Microscopic World I
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Which of the following species has / have the same electronic arrangement?
(1) K+
(2) Mg2+
(3) Cl–
A
B
C
D
(1) only
(2) only
(1) and (3) only
(2) and (3) only
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
7
Mastering Chemistry
Which of the following statements about the conversion of an magnesium atom to a
magnesium ion is / are correct?
(1) The atomic number of magnesium decreased by 2.
(2) The number of electrons in a magnesium ion is smaller than that in a magnesium atom.
(3) The number of occupied electrons shell in a magnesium ion is smaller than that in a
magnesium atom.
A
B
C
D
8.
Microscopic World I
(1) only
(2) only
(1) and (3) only
(2) and (3) only
Consider the following statements and choose the best answer:
1st statement
2nd statement
A fluoride ion has one more occupied electron A fluorine atom gains one electrons to form a
shell than a fluorine atom.
fluoride ion.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 6 The Periodic Table Test
Answer Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
/ 25
Section I – Multiple choice questions
(8 marks)
1
2
3
6
7
8
4
5
Section II – Short questions
9
(17 marks)
The table below lists the information about lithium and sodium, two metals in Group I of the
periodic table.
Metal
Density ( g cm-3)
Melting
Boiling
point (°C)
point (°C)
Lithium
181
1 347
0.53
Sodium
98
883
0.97
a)
i)
Suggest why lithium and sodium should be stored under oil.
(1 mark)
ii)
Suggest why lithium floats on paraffin oil but sodium sinks.
(1 mark)
iii) Suggest what happens to the fresh surface after a piece of sodium is freshly cut.
(1 mark)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
b)
Microscopic World I
Mastering Chemistry
i)
State one property of sodium that is typical of all metals.
ii)
one property of sodium that is NOT typical of most other metals.
(1 mark)
(1 mark)
c)
When sodium is added to water, a reaction occurs. Describe TWO observations in this
reaction.
(2 marks)
d)
Potassium is another metal in group I. Predict the difference between the reaction of
potassium with water and that between sodium with water.
(1 mark)
e)
Explain, in terms of electronic arrangements of their atoms, why sodium and potassium
have similar chemical properties.
(1 mark)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
10
a)
What is the name of Group VII elements?
b)
How do the melting points of Group VII elements change down the group?
Mastering Chemistry
(1 mark)
(1 mark)
c)
A few drops of sodium sulphite solution is added to bromine solution and iodine solution
respectively.
i) Write an observation for each of these two solution of Group VII elements. (2 marks)
ii)
How does a bromine atom change into a bromide ion?
(1 mark)
d)
Which metal and non-metal in the following table would react most vigorously with each
other? Write a word equation for this reaction.
(2 marks)
e)
Suggest a hazard warning label should be placed on a jar of chlorine.
END
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1 mark)
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 6 The Periodic Table Test
Suggested Answers
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
/ 25
Section I – Multiple choice questions
(8 marks)
1
D
2
A
3
A
6
C
7
D
8
C
4
Section II – Short questions
9
a)
b)
c)
10
D
5
A
(17 marks)
i)
To prevent them from reacting with air and moisture.
(1)
ii)
Lithium has a lower density than paraffin oil, but sodium has a higher density than
paraffin oil.
(1)
iii) The fresh shiny surface becomes dull.
(1)
i)
High conductivity of electricity
(1)
ii)
Low melting point / low boiling point / soft
(1)
Any two of the following:
l Melts to form a silvery ball
l Fizzes quickly
l Moves rapidly on the water surface
l Sometimes the hydrogen ignites and burns with a golden yellow flame
(1)
(1)
(1)
(1)
d)
Potassium reacts more vigorously / need less time to ignite.
(1)
e)
Their atoms have the same number of outermost electrons.
(1)
a)
Halogens
(1)
b)
Melting points increases
(1)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
c)
Microscopic World I
Mastering Chemistry
i)
Orange bromine solution is decolorised
Brown iodine solution is decolorised
(1)
(1)
ii)
Bromine atom accept 1 electrons to become bromide ion
(1)
d)
Potassium and fluorine
Potassium + fluorine à potassium fluoride
e)
Toxic / oxidising
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1)
(1)
(1)
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 07 Ionic and Metallic Bond Test
Question Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
Which of the following substances is an electrolyte?
A Sodium
B Sodium chloride
C Hydrogen chloride
D Distilled water
2
Which of the following pairs of elements would form an ionic compound?
A Sodium and nitrogen
B Fluorine and oxygen
C Hydrogen and bromine
D Magnesium and aluminium
3
Which of the following compounds, when dissolved in water, gives a green solution?
A Potassium dichromate
B Chromium(III) nitrate
C Iron(III) chloride
D Copper(II) sulphate
4
Which of the following combinations is INCORRECT?
Polyatomic ions
A
phosphate ion
B
nitrite ion
C
carbonate ion
D
sulphite ion
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
/ 25
Formula
PO43NO3CO32SO32-
Continuous
assessment
Topic 2
5
6
Which of the following combinations is correct?
Compound
A
iron(II) sulphide
B
sodium nitride
C
lead(II) hydroxide
D
Cupper(I) chloride
Mastering Chemistry
Chemical formula
Fe2S
NaN3
Pb(OH)2
CuCl
Which of the following statements about metallic bond is / are correct?
(1) Positive metallic ions are surrounded by a ‘sea’ of delocalised electrons.
(2) Neutral atoms are surrounded by a ‘sea’ of mobile ions.
(3) Metallic bond exists in sodium chloride.
A
B
C
D
7
Microscopic World I
(1) only
(2) only
(1) and (3) only
(2) and (3) only
Element X react with chlorine to form a chloride. X2+ ion has 20 protons. Which of the
following statements about X is / are correct?
(1) Atoms of X are held to together by ionic bonding.
(2) Chloride of X is an ionic compound.
(3) Element X belongs to Group II of the periodic table.
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
8.
Microscopic World I
Mastering Chemistry
Consider the following statements and choose the best answer:
1st statement
2nd statement
Ammonium ion is a metal ion while chloride
Ammonium chloride is an ionic compound.
ion is a non-metal ion.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 07 Ionic and Metallic Bond Test
Answer Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
2
3
6
7
8
4
5
Section II – Short questions
9
/ 25
(17 marks)
Zinc chloride is an ionic compound formed by zinc and chlorine. Molten zinc chloride can be
decomposed by electrolysis.
a) Explain why molten zinc chloride should be used, but not solid zinc chloride.
(2 marks)
b)
Name the material used to make the electrodes in this experiment.
(1 mark)
c)
What would be observed at the negative electrode during the experiment?
(1 mark)
d)
State ONE potential hazard when carrying out the experiment.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1 mark)
Continuous
assessment
Topic 2
10
Microscopic World I
Mastering Chemistry
When magnesium reacts with chlorine, magnesium chloride is a compound formed
a)
b)
i)
Draw an electron diagram of magnesium atom, showing electrons in the outermost
shells only.
(1 mark)
ii)
Describe the structure and bonding in magnesium with the help of a diagram.
(3 marks)
i)
State the chemical formula of magnesium chloride.
ii)
Draw an electron diagram of magnesium chloride, showing electrons in the
outermost shells only.
(1 mark)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1 mark)
Continuous
assessment
Topic 2
11
Microscopic World I
Mastering Chemistry
The following set-up can be used to show that potassium dichromate is ionic.
a)
b)
i)
Give the chemical formula of potassium dichromate.
(1 mark)
ii)
What would you expect to observe after the power supply has been connected
for 30 minutes? Explain your answer.
(2 marks)
i)
Give the chemical formula of copper(II) sulphate.
ii)
The gel was replaced with one containing copper(II) sulphate and the
experiment repeated. Describe and explain what would be observed.
(1 mark)
(2 marks)
END
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 07 Ionic and Metallic Bond Test
Suggested Answers
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
B
2
A
3
B
6
A
7
C
8
C
Section II – Short questions
9
10
/ 25
4
B
5
C
(17 marks)
a)
Molten zinc chloride conduct electricity because the ions are mobile in molten states.
(1)
Solid zinc chloride does not conduct electricity because the ions are not mobile.
(1)
b)
Graphite / carbon
(1)
c)
Silvery metal (zinc) is produced.
(1)
d)
Chlorine is toxic.
(1)
a)
i)
(1)
ii)
In magnesium, a ’sea’ of delocalised electrons
(1)
surrounds the regular three-dimensional arrangement of positive calcium ions. (1)
(1)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Mastering Chemistry
Continuous
assessment
Topic 2
b)
11
Microscopic World I
i)
MgCl2
Mastering Chemistry
(1)
ii)
(1)
a)
i)
ii)
b)
i)
ii)
K2Cr2O7
(1)
An orange colour moves towards electrode X.
(1)
This is because the orange dichromate ion carries negative charges and is attracted to
the positive electrode X.
(1)
CuSO4
(1)
A blue colour moves towards electrode Y.
(1)
This is because the blue copper(II) ion carries positive charges and is attracted to the
negative electrode Y.
(1)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 08 Covalent Bonds Test
Question Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
1
/ 25
(8 marks)
Consider the following information about two elements:
Element
Atomic number
Relative atomic mass
X
9
19.0
Y
12
24.3
The formula mass of the compound formed by X and Y is
A 43.3.
B 62.3.
C 67.6.
D 86.6.
2
The electron diagram of a compound formed between element X and element Y is shown
below:
(Only electrons in the outermost shells are shown.)
Which of the following combinations is correct?
X
A
oxygen
B
oxygen
C
silicon
D
silicon
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Y
chlorine
hydrogen
hydrogen
chlorine
Continuous
assessment
Topic 2
3
Microscopic World I
Mastering Chemistry
The following table lists the atomic numbers of four elements:
Element
W
X
Y
Z
Atomic number
7
9
18
20
Which of the following combinations is correct?
Compound formed from
Type of bonding in compound
A
Y and Z
ionic bond
B
C
D
4
ionic bond
covalent bond
covalent bond
Which of the following statements about a nitrogen molecule are correct?
(1) An nitrogen atom forms a triple covalent bond with another nitrogen atom.
(2) Each nitrogen atom has 1 pair of lone pair electrons.
(3) The total number of electrons in the molecule is 10.
A
B
C
D
5
W and Z
X and Z
W and X
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Which of the following substances contain covalent bonds?
(1) Carbon disulphide
(2) Water
(3) phosphorus trichloride
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
6
Microscopic World I
Mastering Chemistry
Which of the following combinations are correct?
Substance
(1)
chlorine
(2)
neon
(3)
sodium
A
B
C
D
Type of bonding
covalent
covalent
ionic
(1) only
(2) only
(1) and (3) only
(2) and (3) only
7
An element X exists as molecules and it has an atomic number of 7. Which of the following is
the electron diagram of a molecule of X?
(Only electrons in the outermost shells are shown.)
8.
Consider the following statements and choose the best answer:
1st statement
Helium exists as monoatomic molecules.
A
B
C
D
2nd statement
Helium atoms does not form covalent bonds
with other atoms.
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 08 Covalent Bonds Test
Answer Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
2
3
6
7
8
Section II – Short questions
9
/ 25
4
5
(17 marks)
Chlorine is an element in Group VII of the periodic table.
a) i) The mass number of every chlorine atom is a whole number, but the element
chlorine has a relative atomic mass of 35.5. Explain why the relative atomic mass of
chlorine is not a whole number.
(1 mark)
ii)
b)
Draw the electronic diagram of a chlorine atom, showing outermost shell electrons
only.
(1 mark)
Chlorine combine hydrogen to form hydrogen chloride. Draw an electron diagram of a
hydrogen chloride molecule, showing outermost shell electrons only.
(1 mark)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
10
Microscopic World I
Mastering Chemistry
Consider the following information about three elements.
a)
Atomic number
X
3
Y
6
Z
8
P is a compound formed from elements X and Z.
i) Predict the type of compound (ionic or covalent) formed.
ii)
b)
Element
(1 mark)
Draw an electron diagram of P, showing electrons in the outermost shells only.
(1 mark)
iii) Name P.
(1 mark)
Q is a compound formed from elements Y and Z.
i) Predict the type of compound (ionic or covalent) formed.
(1 mark)
ii)
Draw an electron diagram of Q, showing electrons in the outermost shells only.
(1 mark)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
iii) Name Q.
11
12
Mastering Chemistry
(1 mark)
Draw electron diagrams of the following species, showing electrons in the outermost shells
only. Then, calculate their molecular mass.
a) Oxygen molecule
(2 marks)
b)
tetrachloromethane (CCl4) molecule
a)
Ammonia (NH3) molecules are formed by hydrogen atoms and nitrogen atoms by
covalent bonds.
i) Explain how covalent bond is formed.
(1 mark)
ii)
(2 mark)
Draw an electron diagram of NH3 molecule, showing electrons in the outermost
shells only.
(1 mark)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
b)
Microscopic World I
Mastering Chemistry
Ammonia reacts with hydrogen chloride to form ammonium chloride (NH4Cl). NH4Cl
consists of NH4+ and Cl– ions. NH4+ has a dative covalent bond.
i) What is dative covalent bond?
(1 mark)
ii)
Draw an electron diagram of NH4+, showing electrons in the outermost shells only.
(1 mark)
END
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 08 Covalent Bonds Test
Suggested Answers
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
B
2
A
3
B
6
A
7
D
8
A
4
A
Section II – Short questions
9
a)
i)
ii)
/ 25
Isotope exist / atoms with different number of neutrons exist.
5
D
(17 marks)
(1)
(1)
b)
(1)
10
a)
(1)
32.0
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1)
Continuous
assessment
Topic 2
Microscopic World I
b)
17
a)
Mastering Chemistry
(1)
154.0
(1)
i)
(1)
Ionic
ii)
(1)
b)
a)
iii) Lithium oxide
(1)
i)
(1)
Covalent
ii)
(1)
iii) Carbon dioxide
(1)
i)
A covalent bond is formed when one or more pairs of outermost shell electrons are
shared between two atoms.
(1)
ii)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
(1)
b)
i)
A dative covalent bond is a covalent bond in which the bond pair electrons are
provided by the same atom.
(1)
ii)
(1)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 09 Relating the Properties of Substances to Structures and Bonding Test
Question Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
Which of the following combinations is correct?
Substances
Type of structure
A
argon
simple molecular structure
B
iodine
giant covalent structure
C
silicon(IV) oxide
giant ionic structure
D
zinc
giant metallic structure
2
Which of the following substances can conduct electricity?
A Molten sulphur
B Pure ethanol
C Molten potassium iodide
D Pure diamond
3
/ 25
The following table lists the information about four substances:
Substances
Electrical conductivity
Solid
Molten
In water
W
û
û
û
X
û
û
insoluble in water
Y
û
ü
ü
Z
û
ü
insoluble in water
(ü = conducting, û = non-conducting)
Which of the following substances may be lithium chloride?
A W
B X
C Y
D
Z
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
4
Compounds with simple molecular structures have low melting points because
A the covalent bonds between the atoms are weak.
B the van der Waals’ forces between the atoms are weak.
C the covalent bonds between the molecules are weak.
D the van der Waals’ forces between the molecules are weak.
5
Tungsten have high melting points and boiling points because there are
A strong attractions between the ions.
B strong attractions between the delocalised electrons.
C strong attractions between the ions and the delocalized electrons.
D strong attraction between the molecules.
6
Which of the following statements about potassium bromide are correct?
(1) It is brittle.
(2) It is malleable.
(3) It has the same structure as sodium chloride.
A
B
C
D
7
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Which of the following statements about iodine are correct?
(1) It sublimes when heated.
(2) Van der Waals’ forces hold the discrete atoms together.
(3) It dissolves in distilled water.
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
8.
Microscopic World I
Mastering Chemistry
Consider the following statements and choose the best answer:
1st statement
2nd statement
Ionic bond is strong, but covalent bond is
NaCl has a high melting point, but PCl3 has a
weak.
low melting point.
A
B
C
D
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 09 Relating the Properties of Substances to Structures and Bonding Test
Answer Book
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
2
3
6
7
8
4
Section II – Short questions
9
/ 25
5
(17 marks)
Caesium chloride is an ionic compound.
a)
Draw a diagram to show the structure of caesium chloride.
b)
Explain why caesium chloride has a high melting point.
(2 marks)
c)
Explain the electrical conductivity of caesium chloride.
(2 marks)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1 mark)
Continuous
assessment
Topic 2
10
11
Microscopic World I
Mastering Chemistry
Graphite is used in pencil leads.
a) What type of structure does graphite have?
(1 mark)
b)
Draw the structure of graphite
(1 mark)
c)
Describe the bonding of atoms in graphite and explain why graphite can conduct
electricity.
(2 marks)
Oxygen is a gas at room temperature.
a) Draw an electron diagram of oxygen. Show the outermost shell electrons only.
(1 mark)
b)
Explain why oxygen has a low boiling point in terms of structure and bonding.
(2 marks)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
12
Microscopic World I
Mastering Chemistry
Copper is a metal with very good conductivity and is malleable. It is communing used as
electrical wire.
a)
Explain why a metal conducts electricity, with the help of a diagram; and
(3 marks)
b)
Explain why a metal is malleable.
(2 marks)
END
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Unit 09 Relating the Properties of Substances to Structures and Bonding Test
Suggested Answers
Name:
Time allowed: 30 mins
Class:
(
)
Marks:
Section I – Multiple choice questions
(8 marks)
1
A
2
C
3
C
6
B
7
A
8
C
4
D
5
Section II – Short questions
9
10
/ 25
a)
C
(10 marks)
(1)
b)
Caesium chloride has a giant ionic structure.
Strong ionic bonds between oppositely charged ions hold the ions together.
c)
In molten or aqueous caesium chloride, there are mobile ions, so it conducts electricity.(1)
In solid caesium chloride, there are no mobile ions, so it cannot conduct electricity.
(1)
a)
Giant covalent structure
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1)
(1)
(1)
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
b)
c)
11
(1)
Each carbon atom has four outermost shell electrons. Each carbon atom in graphite
uses three electrons to form covalent bonds with other atoms of the same layer.
The remaining electron is delocalized along the layers of carbon atoms.
(1)
(1)
a)
(1)
12
b)
Oxygen has a simple molecular structure.
Oxygen molecules held together by weak van der Waals’ forces.
(1)
(1)
a)
In copper, a ‘sea’ of delocalized electrons surrounds the regular three-dimensional
arrangement of positive metallic ions.
(1)
The boiling point of copper is high because the attractive forces between the metallic ions
and the electrons are strong.
(1)
(1)
b)
The layers of positively charged metallic ions slide over each other when the metal is
hammered.
(1)
New metallic bonds are re-formed.
(1)
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
assessment
Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Topic 02 Microscopic World I Test
Question Book
Name:
Time allowed: 1 hr
Class:
(
)
Section I – Multiple choice questions
Marks:
/ 50
(15 marks)
Direction: Questions 1 – 3 refer to the following outline of the periodic table. The letters W to Z are
NOT the symbols of the elements.
1
Which is the least reactive?
A W
B X
C Y
D Z
2
Which can form a coloured compound with chlorine?
A W
B X
C Y
D Z
3
Which of the following element consists of diatomic molecules?
A W
B X
C Y
D Z
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Continuous
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Topic 2
Microscopic World I
Mastering Chemistry
$$
#$Mn?
4
How many electrons and neutrons are there in an manganese(II) ion formed from
Number of electrons
Number of neutrons
A
23
27
B
23
30
C
27
27
D
27
30
5
The electronic arrangement of an atom of element X is 2,8,2. Which of the following
statements about element X is INCORRECT?
A X is a Group II element of the periodic table.
B X is a Period 3 element of the periodic table.
C X can form X2– ion.
D X has delocalised electrons.
6
Consider the electron diagram of an ion of element X:
Which of the following combinations about X is correct?
Group
Period
A
I
4
B
I
3
C
VII
4
D
VII
3
7
Both bromine and chlorine belong to the same group of the periodic table. Which of the
following statements about bromine is correct?
A It can share electrons with sodium.
B It can form Br– ions when combined with carbon.
C It is highly soluble in non-aqueous solvents.
D It is more reactive than chlorine.
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Continuous
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Topic 2
8
9
Microscopic World I
Which of the following combinations is INCORRECT?
Ion
A
Cr2O72–(aq)
B
Fe2+(aq)
C
Cr3+(aq)
D
MnO4–(aq)
Mastering Chemistry
Colour
orange
yellow-brown
green
purple
Which of the following electron diagrams best represents a compound formed between silicon
and chlorine?
(Only electrons in the outermost shells are shown.)
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Continuous
assessment
Topic 2
10
Microscopic World I
Mastering Chemistry
X is an element in the second period of the periodic table. The chemical formula of the
compound formed between X and nitrogen is is NX3. Which of the following electron
diagrams best represents the compound formed between X and magnesium?
(Only electrons in the outermost shells are shown.)
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Continuous
assessment
Topic 2
11
Microscopic World I
Mastering Chemistry
Consider the information below:
Solid
Melting point
Electrical conductivity in
molten state
Solubility in water
W
low
good
soluble
X
high
good
insoluble
Y
low
non-conducting
insoluble
Z
high
non-conducting
soluble
Which of the following solids is likely to be iodine?
A W
B X
C Y
D Z
12
Element X and element Y are in Period 3 in the Periodic table. X and Y combine to form an
ionic compound P. The electron diagram of compound P is shown below:
(Only electrons in the outermost shells are shown.)
Which of the following statements is / are correct?
(1) Element X must be a Group II element.
(2) An atom of Y contains 8 electrons.
(3) Compound P is colourless.
A
B
(1) and (2) only
(1) and (3) only
C
D
(2) and (3) only
(1), (2) and (3)
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13
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
A substance has a high melting point and conduct electricity when molten. It may be
(1) graphite.
(2) iron.
(3) magnesium bromide.
A
B
C
D
15
Mastering Chemistry
X+ ion has an electronic arrangement of 2,8. Which of the following statements about the
chloride of X are correct?
(1) It has a giant metallic structure.
(2) Its aqueous solution is colourless.
(3) It has high melting point.
A
B
C
D
14
Microscopic World I
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Consider the following statements and choose the best answer:
1st statement
Graphite can conduct electricity at room
temperature and pressure.
A
B
C
D
2nd statement
Graphite has a giant covalent structure
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
The 1st statement is false but the 2nd statement is true.
Both statements are false.
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Topic 2
Microscopic World I
Mastering Chemistry
Continuous Assessment
Topic 02 Microscopic World I Test
Answer Book
Name:
Time allowed: 1 hr
Class:
(
)
Marks:
Section I – Multiple choice questions
(15 marks)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Section II – Short questions
16
/ 50
(35 marks)
A sample of calcium has three isotopes. The following table lists the relative abundance of the
three isotopes.
Isotope
Relative abundance (%)
40
Ca
97.0
42
Ca
1.0
44
Ca
2.0
a)
What is the meaning of ‘isotope’?
(2 marks)
b)
The atomic number of calcium is 20. Complete the following table.
(3 marks)
Isotope
40
Ca
42
Ca
44
Ca
Number of protons
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Number of neutrons
Electronic
arrangement
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c)
Calculate the relative atomic mass of calcium in this sample.
(2 marks)
d)
Explain whether these three isotopes can be separated by any chemical method. (1 mark)
e)
Suggest how to test whether calcium is a metal.
(1 mark)
A part of the periodic table is shown below.
a)
Sodium (Na) and potassium (K) are Group I elements.
i)
What is the name of Group I elements?
ii)
Explain, in terms of electronic arrangements of their atoms, why Na and K have
similar chemical properties.
(1 mark)
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(1 mark)
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iii) Suggest a hazard warning should be carried by a bottle potassium and sodium.
(1 mark)
iv) Suggest how to store group I metals such as Na and K.
v)
b)
18
a)
(1 mark)
When molten sodium is heated with chlorobutane, they react steadily. Would there
any similarity and difference can be observed if molten potassium is heated with
chlorobutane? Explain your answer.
(2 marks)
Neon (Ne) and argon (Ar) are Group 0 elements.
i)
Suggest why they do NOT form compounds.
(1 mark)
ii)
Explain whether argon or neon has a higher boiling point.
(1 mark)
Compound X is combined from potassium and sulphur.
i)
Draw an electron diagram of compound X, showing electrons in outermost shells
only.
(1 mark)
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ii)
Mastering Chemistry
What is the formula mass of compound X?
(Relative atomic mass: K = 39.1, S = 32.1)
(1 mark)
iii) Compare the electrical conductivity of compound X when solid and when molten.
Explain your answer.
(2 marks)
b)
c)
Compound Y is combined from hydrogen and sulphur.
i)
Draw an electron diagram of compound Y, showing electrons in outermost shells
only.
(1 mark)
ii)
Name compound Y.
Explain whether compound X or compound Y has a lower boiling point.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
(1 mark)
(4 marks)
Continuous
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Topic 2
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19
The diagram represents the structure of silver.
a)
Use the diagram to help you explain why silver is malleable.
b)
Mastering Chemistry
(3 marks)
The structure of quartz is shown below.
i)
Explain why quartz cannot conduct electricity?
ii)
With reference to its structure and bonding, explain why quartz is a hard material.
(2 marks)
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(1 mark)
Continuous
assessment
Topic 2
20
Microscopic World I
Mastering Chemistry
Phosphorus is in the same group as nitrogen in the periodic table. Under suitable condition, a
molecule of PH3 combines with an H+ ion to form a PH4+ ion.
Name the type of bond formed when PH3 reacts with H+ and explain how this bond is formed.
(2 marks)
END
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Topic 2
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Mastering Chemistry
Continuous Assessment
Topic 02 Microscopic World I Test
Suggested Answers
Name:
Time allowed: 1 hr
Class:
(
)
Marks:
/ 50
Section I – Multiple choice questions
(15 marks)
1
B
2
C
3
D
4
B
5
C
6
A
7
C
8
B
9
D
10
B
11
C
12
B
13
C
14
C
15
B
Section II – Short questions
16
a)
(35 marks)
Atoms of an element with the same number of protons
but different number of neutrons.
(1)
(1)
b)
Isotope
Number of
protons
Number of
neutrons
Electronic
arrangement
40
Ca
20
20
2,8,8,2
42
Ca
20
22
2,8,8,2
44
Ca
20
24
2,8,8,2
(3)
(3 marks for all correct, 1 mark for each correct row)
c)
40 × 97.0 + 42 × 1.0 + 44 × 2.0
100
= 40.1
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(1)
(1)
Continuous
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Topic 2
17
Mastering Chemistry
d)
No. Isotopes of the same elements have the same chemical properties.
(1)
e)
Test its electrical conductivity. Metal can conduct electricity.
(1)
a)
i)
Alkali metals
(1)
ii)
Their atoms have the same number of outermost shell electrons.
(1)
b)
18
Microscopic World I
a)
iii) Flammable.
(1)
iv) Store in paraffin oil.
(1)
v)
Potassium reacts with chlorobutane more vigorously.
The reactivity of Group I elements increases down the group.
(1)
(1)
i)
A neon and an argon atom has 8 outermost shell electrons.
(1)
ii)
Argon has a higher boiling point, since boiling point of Group 0 elements increases
down the group.
(1)
i)
(1)
ii)
2 × 39.1 + 32.1
= 110.3
(1)
iii) Potassium sulphide conducts electricity when molten because ions are mobile in
molten state.
(1)
Potassium sulphide does NOT conduct electricity when solid, because ions are
NOTmobile in solid state.
(1)
b)
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i)
ii)
19
20
(1)
Hydrogen sulphide
(1)
c)
Potassium sulphide has a giant ionic structure.
(1)
Potassium ions and sulphide ions held together by strong ionic bonds. Thus, it has high
boiling point.
(1)
Hydrogen sulphide has a simple molecular structure.
(1)
Hydrogen sulphide molecules held together by weak van der Waals’ forces. Thus, it has
low boiling point.
(1)
a)
In silver, a ‘sea’ of delocalised electrons surrounds the regular three-dimensional
arrangement of positive metallic ions.
(1)
When we apply a force to a piece of nickel, the layers of metallic ions slide over each
other to new position.
(1)
New metallic bonds are re-formed between the metallic ions in new positions and the
delocalised electrons.
(1)
b)
i)
Quartz does not have delocalised electrons and mobile ions.
ii)
Quart has a giant covalent structure.
(1)
In quartz, the atoms join together by strong covalent bonds and form a network. (1)
(1)
Dative covalent bond
(1)
The phosphorous atom of PH3 provides both the electrons when bonded with the hydrogen ion.
(1)
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Topic 2 Microscopic World I
Unit 5 Atomic structure
Section 5.1 - 5.8
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Basic structure of an atom
Basic Atomic Structure
http://chem.jingkung.com/pre_study/student/topic2unit5_eng
Watch the animation of the above website and complete the fill-in-the blank questions below.
1. A tiny region in the centre of an atom is the ______nucleus_______. This is made up of
subatomic particles, called ____protons________ and _____neutrons_______. This tiny region
is surrounded by a cloud of negatively charged particles called ____electrons______.
2.
A neutral atom has the same number of ___protons_________ and ____neutrons_______.
3. a)
____Hydrogen_______ atom has just one proton and one electron.
b)
An _____oxygen________ atom has eight protons and eight electrons.
c)
An ____iron___________ atom has 26 protons and 26 electrons.
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Topic 2
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Topic 2 Microscopic World I
Unit 5 Atomic structure
Section 5.9
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Electron shell and electronic configuration
Drawing electron configuration diagrams | Chemistry for All | The Fuse School
https://goo.gl/rzL0um
https://www.youtube.com/watch?v=hSkJzE2Vz_w
Watch the video of the above website and answer the following questions.
1. a)
b)
Draw the electronic diagram of lithium atom.
Write the electronic configuration of lithium atom.
2, 1
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Topic 2
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2. a)
Draw the electronic diagram of calcium atom.
b)
3. a)
Mastering Chemistry
Write the electronic configuration of calcium atom.
2, 8, 8, 2
Draw the electronic diagram of oxygen atom.
[抄新書 1B p.36 Fig6.6]
b)
Write the electronic configuration of oxygen atom.
2, 6
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Topic 2
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Topic 2 Microscopic World I
Unit 6 The Periodic Table
Section 6.1 - 6.3
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
The periodic table
How the Elements are Laid Out in the Periodic Table?
http://chem.jingkung.com/pre_study/student/topic2unit6v1_eng
What are Periods and Groups in the Periodic Table?
http://chem.jingkung.com/pre_study/student/topic2unit6v2_eng
Watch the animation of the above website and complete the fill-in-the blank questions below.
How the Elements are Laid Out in the Periodic Table?
1. The elements are ordered by __atomic mass__________ in the Mendeléev’s Table while the
elements are ordered by __atomic number________ in the Modern Periodic Table.
2. Mendeléev noticed that ___iodine_____ has similar properties to fluorine, chlorine and bromine,
so he broke his own rule and put these elements in the same column of the table.
3. In the Modern Periodic Table, there are currently around ___115 / 118___elements. New
elements made by scientists are highly __radioactive__.
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Mastering Chemistry
What are Periods and Groups in the Periodic Table?
4. In the Periodic Table, the rows going across from left to right are called ___Period_____ and the
columns going down from top to bottom are called ____Group_____.
5. The number of electrons in the outermost shell governs the __reactivity___ of the elements,
which explains why elements in the same group have __chemical____ properties.
6. The electronic arrangement of a chlorine atom is __2,8,7______. Chlorine is in Group _VII_
and Period __3__ of the periodic table.
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Topic 2
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Topic 2 Microscopic World I
Unit 6 Periodic table
Section 6.4 - 6.9
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Reactions of group I metals with water
Reactions of group 1 metals
https://goo.gl/dvqkgH
https://www.youtube.com/watch?v=dUAmscn6OCg
Watch the video of the above website and answer the following questions.
1. a)
What gas is produced when lithium reacts with water?
Hydrogen
b)
In the video, was the hydrogen ignited by the heat of the reaction or ignited by a lighter?
The hydrogen was ignited using a lighter.
2. a)
What gas is produced when sodium reacts with water?
Hydrogen
b)
In the video, was the hydrogen ignited by the heat of the reaction or ignited by a lighter?
The hydrogen was ignited by the heat of the reaction.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
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Topic 2
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3. a)
What gas is produced when potassium reacts with water?
Mastering Chemistry
Hydrogen
b)
In the video, when potassium reacted with water, was the hydrogen ignited by the heat of
the reaction immediately or after some time?
The hydrogen was ignited immediately when potassium reacted with water.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
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Topic 2
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Topic 2 Microscopic World I
Unit 7 Ionic and metallic bonds
Section 7.1 - 7.10
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Introduction to ionic bonds
What are Ionic Bonds?
http://chem.jingkung.com/pre_study/student/topic2unit7_eng
Watch the video clip and complete this worksheet.
1. Describe, in terms of electron transfer, how sodium and chlorine atoms react to form particles in
sodium chloride.
Sodium atom transfer one electron to chlorine atom to form sodium ion and chloride ion_____
____________________________________________________________________________
2. Draw electron diagrams of the two types of particles in sodium chloride.
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3. Name the type of bonding in sodium chloride.
Ionic bonding
4. Describe, in terms of electron transfer, how magnesium and oxide atoms react to form particles
in magnesium oxide.
Magnesium atom transfer two electrons to oxygen atom to form magnesium ion and oxide
ion_________________________________________________________________________
5. Draw electron diagrams of the two types of particles in magnesium oxide.
6. Describe, in terms of electron transfer, how calcium reacts with chlorine to form particles in
calcium chloride.
Calcium atom transfer one electron to a chlorine atom and another electron is transferred to
another chlorine atom form one chloride ion and two chloride ions___ ________________
7. Draw electron diagrams of the two types of particles in calcium chloride.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
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Topic 2
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Topic 2 Microscopic World I
Unit 8 Covalent bonds
Section 8.1-8.7, 8.9
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Covalent bonds
GCSE Science Chemistry (9-1) Covalent bonding 1
https://goo.gl/3mCT81
https://www.youtube.com/watch?v=lenvZEcMc60
Watch the video of the above website and answer the following questions.
1. Draw the electron diagram (energy level diagram) of H2 .
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Prestudy
Topic 2
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2. Draw the electron diagram (energy level diagram) of Cl2 .
3. Draw the electron diagram (energy level diagram) of HCl.
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Mastering Chemistry
Prestudy
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Topic 2 Microscopic World I
Unit 8 Covalent bonds
Unit 8.8
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Dative covalent bond
Co-ordinate Covalent Bond (Dative Covalent Bond)
https://chem.jingkung.com/pre_study/student/topic2unit8
Watch the video clip and complete this worksheet.
1. ___Dative bond_______ is the bond formed by sharing of _ electron pair ______ but the shared
pair is contributed by one atom.
2. The atom which contributes the electron pair for sharing is called electron pair _____donor______.
An atom which accepts electron pair is called electron pair _______acceptor_______.
3. Draw an electron diagram for the formation of a dative covalent bond in an ammonium ion (NH4+).
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
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Topic 2
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Topic 2 Microscopic World I
Unit 9 Relating the properties of substances to structures and bonding
Section 9.1 - 9.3
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Ionic Compounds and their properties
Ionic Compounds and their properties
http://chem.jingkung.com/pre_study/student/topic2unit9_eng
Watch the video of the above website and answer the following questions.
1. Give the THREE ionic compounds mentioned in the video. Suggest ONE use for each of the ionic
compounds.
Sodium Chloride: table salt.
Sodium Fluoride: added to some toothpastes to help strengthen tooth enamel.
Ammonium nitrate: fertilize plants.
2. What structure do the ionic compounds have?
Giant ionic stuctrure
3. Suggest FOUR properties of ionic compounds mentioned in the video.
high melting points
brittle
water soluble
can conduct electricity when dissolved in water or molten
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
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4. Draw an electron diagram for the formation of a dative covalent bond in a hydronium ion (H3O+).
5. Draw an electron diagram for the formation of ammonia boron trifluoride molecule (NH3BF3).
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
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Topic 2
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Topic 2 Microscopic World I
Unit 9 Relating the properties of substances to structures and bonding
Section 9.1 - 9.3
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Ionic Compounds and their properties
Ionic Compounds and their properties
http://chem.jingkung.com/pre_study/student/topic2unit9_eng
Watch the video of the above website and answer the following questions.
1. Give the THREE ionic compounds mentioned in the video. Suggest ONE use for each of the ionic
compounds.
Sodium Chloride: table salt.
Sodium Fluoride: added to some toothpastes to help strengthen tooth enamel.
Ammonium nitrate: fertilize plants.
2. What structure do the ionic compounds have?
Giant ionic stuctrure
3. Suggest FOUR properties of ionic compounds mentioned in the video.
high melting points
brittle
water soluble
can conduct electricity when dissolved in water or molten
©2019 Jing Kung Educational Press Ÿ All Rights Reserved
Prestudy
Topic 2
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Topic 2 Microscopic World I
Unit 9 Relating the properties of substances to structures and bonding
Unit 9.4 - 9.6
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Graphite
GCSE Chemistry Revision Properties of small covalent molecules
https://www.youtube.com/watch?v=dEZItwgZeFU
Watch the video of the above website and answer the following questions.
1. Why graphite has a high melting point and boiling point?
Graphite has many strong covalent bonds.
2. Why graphite slippery?
The hexagonal rings of carbon atoms are arranged in layers. There are no covalent bonds
between layers, so the layers can slide.
3. Why graphite can conduct electricity and heat?
Delocalised electrons can move.
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Topic 2
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Topic 2 Microscopic World I
Unit 9 Relating the properties of substances to structures and bonding
Unit 9.9 - 9.11
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Simple molecular structure
GCSE Chemistry Revision Properties of small covalent molecules
https://www.youtube.com/watch?v=br7hLsJhiys
Watch the video of the above website and answer the following questions.
1. Do covalent molecules have a high or low melting point?
Low.
2. Explain why melting point of covalent molecules as your answer in (1).
weak intermolecular force
3. Will the force you written in (2) stronger or weaker among larger-sized molecule?
Stronger
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Topic 2
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Topic 2 Microscopic World I
Unit 9 Relating the properties of substances to structures and bonding
Unit 9.9 - 9.11
Pre-study worksheet
Name: __________________
Class: ______________ (
)
Date: ___________________
Metallic bonds
What are metallic bonds? | Chemistry for All | The Fuse School
https://www.youtube.com/watch?v=S08qdOTd0w0
Watch the video of the above website and answer the following questions.
1. a)
Metals are malleable. What is the meaning of ‘malleable’?
‘Malleable’ means they can be moulded / hammered into different shapes.
b)
Metals are ductile. What is the meaning of ‘ductile’?
‘Ductile’ means they can be stretched into wires
2. a)
In the ‘sea of electrons’ model, what are free-flowing (or delocalized)?
Electrons
b)
In the ‘sea of electrons’ model, what are in a lattice structure?
Metal ions
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3. What is ‘metallic bonding’?
‘Metallic bonding’ is the electrostatic attraction between metal ions arranged in the lattice
structure and delocalized electrons.
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