YMCA of Hong Kong Christian College
Summer Assignments
F.3
CHEMISTRY
75 Marks
Total no. of pages: 19
Question-Answer Book
Name: ______________________
Class: ________
Class No.: _____
Set: 3.1 / 3.2 / 3.3
GENERAL INSTRUCTIONS
1.
There are TWO sections, A and B, in this assignment.
2.
Section A consists of multiple-choice questions, while Section B contains short questions.
3.
Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers
to Section B should be written in the spaces provided in Question-Answer Book.
4.
A Periodic Table is printed on the last page. You may use it if necessary.
Explanation
F.3 Chemistry Summer Assignments
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SECTION A: MULTIPLE CHOICE QUESTIONS (25 marks, 1 mark @)
Choose the best answer for each question.
Candidates may refer to the Periodic Table printed on the last page.
1.
A
B
C
D
The above figure shows an experiment to compare the rate of diffusion between ammonia
gas and hydrogen chloride gas. At which point will the white fumes of ammonium
chloride first formed?
2.
Solid carbon dioxide changes directly into a gas under suitable conditions of temperature
and pressure.
Carbon dioxide gas moves from a high concentration to a low concentration.
Which row names these two processes?
3.
Changing from solid to gas
Moving from a high concentration
to a low concentration
A
Evaporation
Brownian motion
B
Evaporation
Diffusion
C
Sublimation
Brownian motion
D
Sublimation
Diffusion
A mixture of ice and water is left to stand and the ice melts.
Which row describes what happens as the ice is melting?
Temperature of mixture
Energy changes
A
Increases
Average kinetic energy of particles increases
B
Increases
Energy is used to overcome attractive forces
C
Stays the same
Average kinetic energy of particles increases
D
Stays the same
Energy is used to overcome attractive forces
F.3 Chemistry Summer Assignments
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4.
Which particle diagrams shows the correct arrangement of particles when argon gas is
cooled to below its boiling point, but above its melting point?
A.
B.
C.
5.
D.
Which row about a change of state is correct?
Change of state
Energy change
Process
A
Solid à Liquid
Heat given out
Melting
B
Gas à Liquid
Heat taken in
Evaporation
C
Solid à Gas
Heat taken in
Sublimation
D
Liquid à Solid
Heat given out
Condensing
6.
Which of the following statement best describes a solute?
A. The mixture of different solvents.
B. The only substance that is inside a saturated solution.
C. The compound of a solution and a solvent.
D. The substance that dissolves in a solvent.
7.
Which of the following procedures is most suitable for getting sodium chloride from a
muddy sea water?
A. Filtration à Evaporation à Saturated solution à Crystallisation
B. Evaporation à Dilute solution à Concentrated solution à Fractional Distillation
C. Filtration à Evaporation à Saturated solution à Simple distillation
D. Evaporation à Concentrated solution à Saturated solution à Evaporation until
dryness
F.3 Chemistry Summer Assignments
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8.
Which process is used to separate oxygen from liquid air?
A. Chromatography
B. Distillation
C. Filtration
D. Fractional Distillation
9.
Different methods of separation rely on substances having different properties.
Which property does distillation make use of?
A. Boiling point
B. Colour
C. Particle size
D. Solubility in different solvents
10.
F.3 Chemistry Summer Assignments
– 4 –
11.
12.
F.3 Chemistry Summer Assignments
– 5 –
13.
Which of the following comparisons between iron(II) sulphide and a mixture of iron and
sulphur is correct?
Iron(II) sulphide
A mixture of iron and sulphur
A
elements in it does not have a fixed ratio
elements in it have a fixed ratio
B
attracted to magnet
only iron is attracted to magnet
C
does not have a sharp melting point
has a sharp melting point
D
constituents can be separated by chemical constituents can be separated by
methods
physical methods
14.
15.
F.3 Chemistry Summer Assignments
– 6 –
16.
The following diagram shows the structure of an atom:
Which of the following combinations is correct?
Number of protons
Period in periodic table
Number of neutrons
A
9
2
10
B
9
7
10
C
10
2
9
D
10
7
9
17.
18.
Which of the following statements concerning an 131I atom and a 131Xe atom is / are
correct?
(1) They have the same number of protons.
(2) They have different numbers of neutrons.
(3) They have different numbers of outermost shell electrons.
A.
B.
C.
D.
(1) only
(2) only
(1) and (3) only
(2) and (3) only
F.3 Chemistry Summer Assignments
– 7 –
19.
Which of the following statements concerning “atom” is correct?
A.
B.
C.
D.
20.
All atoms do not carry net charges
Mass is evenly distributed within an atom.
All atoms consist of protons, neutrons and electrons.
For all elements, atoms of the same element have the same mass number.
Which statement about the trends shown by the elements of Period 3 in the periodic table is
not correct?
A. The elements become less metallic across the period.
B. The group number increases across the period.
C. The number of electron shells increases across the period.
D. The number of outer electrons increases across the period.
21.
22.
Metal X reacts with non-metal Y to form an ionic compound with the formula X2Y.
Which statements are correct?
(1) X is in Group I of the periodic table.
(2) X is in Group II of the periodic table.
(3) Y is in Group VI of the periodic table.
(4) Y is in Group VII of the periodic table.
A.
B.
C.
D.
(1) and (3) only
(1) and (4) only
(2) and (3) only
(2) and (4) only
F.3 Chemistry Summer Assignments
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23.
The chemical formula of sodium borate is Na3BO3. The chemical formula of calcium
borate is
A. CaBO3
B. Ca2BO3
C. Ca3(BO3)2
D. Ca2(BO3)3
24.
25.
Elements X and Y form an ionic compound with chemical formula X2Y. If the ion of X and
the ion of Y have the same electronic arrangement, which of the following may this
compound be?
A. Lithium oxide
B. Aluminium oxide
C. Potassium sulphide
D. Magnesium chloride
END OF SECTION A
F.3 Chemistry Summer Assignments
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SECTION B: SHORT QUESTIONS (50 marks)
Answer ALL questions. Write your answers in the spaces provided.
1.
(a) Carbon disulfide is a liquid at room temperature and pressure.
(5 marks)
Describe the separation and motion of the particles in carbon disulfide liquid.
Separation ________________________________________________________________ [1]
Motion ___________________________________________________________________ [1]
(b)
____________________________________________________________________________
____________________________________________________________________________
_________________________________________________________________________ [3]
F.3 Chemistry Summer Assignments
– 10 –
2.
X is a solid at room temperature and pressure, the heating curve of X is shown below:
(3 marks)
(a) Suggest a temperature range that X will exist as a liquid state.
_____________________________________________________________________ [1]
(b) Suggest the process occurred at 90oC for substance X.
_____________________________________________________________________ [1]
(c) Explain whether solid X is pure.
_____________________________________________________________________ [1]
F.3 Chemistry Summer Assignments
– 11 –
3.
Fractional distillation is always used in the industry for the separation of crude oil.
(4 marks)
The simplified table below shows the properties of the components inside crude oil.
Physical Property
Components
of crude oil
Boiling Point (°C)
Carbon chain
length
Colour
Physical state
Petrol
40
5-8
Clear /
Pale yellow
Liquid
Kerosene
180
10-16
Pale yellow
Liquid
Natural
gas
-161
1-4
Colourless
Gas
Bitumen
340
> 50
Black
Solid
A fractionating column is shown below:
x
y
z
Bitumen
(a) Which physical property is used to separate substances in fractional distillation?
_________________________________________________________________________ [1]
(b) Using the table provided above, match the components of crude oil obtained in the
fractionating column located as x, y, z.
Petrol: _________________ [1]
Kerosene: ________________ [1]
Natural gas: _________________ [1]
F.3 Chemistry Summer Assignments
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4.
Water is an important chemical. It can be obtained in the laboratory from sea water.
A student performs a sequence of steps to extract water from sea water.
(7 marks)
Step
(a) (i)
Procedure
I
Remove any insoluble substances from sea water.
II
Pour the resulting solution from step I to a round-bottomed flask.
III
Perform suitable process on the solution from step II and collect
the resulting liquid from the condenser named ‘S’.
IV
Check whether ‘S’ is water.
V
Check whether ‘S’ is pure.
Name the process involved in Step I.
_________________________________________________________________ [1]
(ii) Draw a labelled set-up for the process involved in Step I.
[3]
(b) Name the process involved in step III.
_____________________________________________________________________ [1]
(c) How can the student check that ‘S’ is water?
_____________________________________________________________________ [1]
(d) What can the student observe in the round-bottomed flask finally if the solution inside is
heated for a very long time?
_____________________________________________________________________ [1]
F.3 Chemistry Summer Assignments
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5.
Chromatography can be used to identify amino acids from a sample of protein.
(7 marks)
The diagram shows the chromatogram obtained when four samples of amino acids were
analysed. The paper was sprayed with ninhydrin.
2cm
40cm
4cm
(a) Why is the origin line drawn in pencil?
_____________________________________________________________________ [1]
(b) Which amino acids could possibly be the same?
_____________________________________________________________________ [1]
(c) Which amino acid sample contains more than one amino acid? Explain your answer.
Sample _________________________________________________________________
Explanation______________________________________________________________
____________________________________________________________________ [2]
(d) Suggest why it is necessary to spray the chromatogram with ninhydrin.
_____________________________________________________________________ [1]
(e) The Rf value of Amino acid 1 is 0.75. What is the distance travelled by amino acid 1 from
the origin?
________________________________________________________________________
____________________________________________________________________ [2]
F.3 Chemistry Summer Assignments
– 14 –
6.
(a) Define the term ‘Isotopes’.
________________________________________________________________________
_____________________________________________________________________ [2]
(b) Rubidium (Atomic number = 37) has 2 stable isotopes 85Rb and 87Rb.
(Given that the relative atomic mass of Rb = 85.5)
Calculate the relative abundance of 87Rb.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
_____________________________________________________________________ [2]
7.
The diagram shows the positions of some elements in the Periodic Table.
(5 marks)
Group
Period
I
II
III
IV
V
VI
VII
0
2
Li
Be
B
C
N
O
F
Ne
3
Na
Mg
Al
Si
P
S
Cl
Ar
4
K
Ca
Br
(a) Complete the following sentence:
The elements in the Periodic Table are arranged in order of _________________________
_________________________________________________________________________ [1]
(b) Suggest why group 0 elements seldom form compounds.
_________________________________________________________________________ [1]
(c) What is the similarity of the atoms in the period 4?
_________________________________________________________________________ [1]
(d) What is the similarity of the atoms in the group IV?
_________________________________________________________________________ [1]
(e) What is the electronic configuration of a bromine atom?
2, 8, ______, ______ [1]
F.3 Chemistry Summer Assignments
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8.
Draw the electron diagram for the compounds formed by the following elements. Show only
the outermost electrons.
(a) Carbon + Sulphur
(4 marks)
(b) Rubidium + Iodine
9.
Complete the following table.
(5 marks, 1 mark each)
Name
Ammonium Phosphate
(ii)
Chemical formula
(i)
Al2(CO3)3
Ni(OH)2
Potassium Dichromate
(iii)
(iv)
Cu(NO3)2
F.3 Chemistry Summer Assignments
Colour of ions
– 16 –
(v)
10. A brand of fertiliser contains only ammonium nitrate (NH4NO3) and potassium chloride
(KCl). This experiment was performed to find out the percentage by mass of NH4NO3 in this
fertiliser. The set-up used is shown below:
(a) The potassium hydroxide, KOH(aq), was slowly added to the fertiliser and the mixture
was heated gently. The NH4NO3(s) in the fertiliser will react with the KOH(aq) under heat
to form ammonia gas, NH3(g), water, H2O(l) and potassium nitrate (KNO3).
Write the balanced equation for the chemical reaction involved.
(1 mark)
(b) The ammonia gas, NH3(g), liberated from the reaction between NH4NO3 and KOH was
first cooled when passing through the water condenser, and then passed through an
inverted funnel to a solution containing 0.0485 mol of excess HCl.
All of the ammonia gas reacts with HCl to form ammonium chloride (NH4Cl), write the
chemical equation involved.
(1 mark)
F.3 Chemistry Summer Assignments
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(c) The remaining HCl in (b) will react with 41cm3 of 0.400 moldm-3 NaOH for complete
reaction according to the following equation:
HCl + NaOH à NaCl + H2O
Remaining
Calculate the number of moles of the remaining HCl.
(1 mark)
(d) Calculate the number of moles of HCl used to react with NH3(g) in part (b).
(1 mark)
(e) Calculate the mass of NH4NO3(s) reacted in part (a).
(1 mark)
(f)
Calculate the percentage by mass of NH4NO3(s) in this fertiliser.
(1 mark)
END OF SECTION B
– THE END –
F.3 Chemistry Summer Assignments
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F.3 Chemistry Summer Assignments
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