The City School
North Nazimabad Boys Campus
Subject: Chemistry
Class: 9
Teacher: Ms Uzma Amer
Date: 12-06-2015
Multiple choice
1. Which of the following has a nucleon (mass) of 3?
2. An atom of any element must contain equal numbers of
A electrons and neutrons.
B electrons and protons.
C neutrons and protons.
D electrons, neutrons and protons.
3. How many protons, neutrons and electrons are present in an atom of the element with proton
(atomic) number 6 and nucleon (mass) number 14?
A
B
C
D
Protons
6
6
8
8
neutrons
8
8
6
6
electrons
6
8
6
8
4. The Table shows the particles in an atom.
Particle
charge
approximate relative mass
Proton
+1
1
Electron
Neutron
1/2000
0
1
Which number completes the table?
A -1
B 0
C +1
D +2
5. The diagram shows the electronic structure of an atom. What is the number of protons in the
nucleus?
A.7
B.13
C.6
D.8
6. Deuterium and tritium are isotopes of hydrogen. What are the correct numbers for X and Y?
Isotope
Deuterium
number of
protons
1
number of
neutrons
1
number of
electrons
1
nucleon (mass)
number
X
tritium
1
2
1
Y
A
B
C
D
X
1
1
2
3
Y
1
2
3
4
7. Which two diagrams show two different types of atom of the same element?
8. Look at given atomic structures
Which electron arrangement corresponds to the first element on period 2 of the Periodic Table?
A. electron arrangement X
B. electron arrangement Y
C. electron arrangement W
D. electron arrangement Z
9. look at the periodic table;
Where in the Periodic Table are you MOST LIKELY to find an element that is a low melting solid and a
good conductor of heat?
A. Group 7
B. Group 1
C. Transition series
D. Group 4
10. Which four quantities A, B, C and D are required to balance the equation? (Note: 1's are not written in
the equation BUT they are needed in the 'balancing ratio thinking'.)
A Na2O(s) + B H2SO4(aq) ==> C Na2SO4(aq) +D H2O(l)
A. 1 2 1 2
B. 2 2 2 1
C. 2 1 2 2
D. 1 1 1 1
11. Which is TRUE about the compound formed on combining an Alkali Metal with the Halogen element
chlorine to form the metal chloride?
I.
II.
III.
IV.
the solution of it in water conducts electricity
the solid conducts electricity
insoluble in water
is an ionic compound
A. I is only
B. I and II only
I, II and III only
C. I an IV only
12. Which of the following is TRUE about the trend DOWN the Group 7 Halogens with increase in atomic
number?
A. the colour of the element gets darker
B. the melting points decrease
C. the reactivity increases
D. the atoms get smaller
13. The equation for the reaction between aqueous lead(II) nitrate and aqueous potassium iodide is
shown.
Pb(NO3) 2(aq) +
Colourless
2KI(aq) → PbI2(s) + 2KNO3(aq)
colourless
yellow
colourless
Which method could be used to separate the products?
A chromatography
B crystallization
C distillation
D filtration
14. How does a magnesium atom form a bond with an oxygen atom?
A by giving one pair of electrons to the oxygen atom
B by sharing one pair of electrons, both electrons provided by the magnesium atom
C by sharing two pairs of electrons, both pairs provided by the oxygen atom
D by sharing two pairs of electrons, each atom donating one pair of electrons
15. What is the general relationship between lattice energy and ionic bond strength?
A. The greater the lattice energy, the weaker the ionic bond
B. there is no relationship
C. the greater the lattice energy, the stronger the ionic bond
D. the weaker the lattice energy, the stronger the ionic bond
16. Magnesium oxide may be used for the lining of an electric furnace for making crockery. Which
properties of magnesium oxide help to explain this use?
strong forces
ionic bonding electrical
between
conductor
particles
A
Yes
Yes
No
B
Yes
No
Yes
C
No
Yes
No
D
No
No
Yes
17. The table shows the electronic structures of four atoms.
Atom
W
X
Y
Z
electronic structure
2,8,1
2,8,4
2,8,7
2,8,8
Which two atoms combine to form a covalent compound?
A. W and X
B. W and Y
C. X and Y
D. X and Z
18. The following statement is about chemical bonds. Covalent bonds are formed by the …1… of
electrons. Covalent substances have …2… electrical conductivity. Which words complete the
statement?
1
A
B
C
D
Sharing
Sharing
Transfer
Transfer
2
High
Low
High
Low
19. Below are two statements about metals.
I .Metals contain a lattice of negative ions in a ‘sea of electrons’.
II. The electrical conductivity of metals is related to the mobility of the electrons in the structure.
Which is correct?
A. Both statements are correct and statement 1 explains statement 2.
B. Both statements are correct but statement 1 does not explain statement 2.
C. Statement 1 is correct and statement 2 is incorrect.
D. Statement 2 is correct and statement 1 is incorrect
20. Which of the following is NOT a trend that varies systematically in the periodic table?
A. Electronegativity
B. symbols of elements
C. ionization energy
D. atomic radius
21. following picture are showing some methods of Purification
What are C,D and E showing?
Distillate
Residue
A
C
D
B
D
E
C
E
D
D
D
C
Evaporation
E
C
C
E
22. The atomic radius of F, Br, and I are 64, 114, and 138 pm respectively. From this information
(and not your book) estimate a reasonable atomic radius of Cl.
A. 53 pm
B. 89 pm n
C. 126 pm
D. 162 pm
23. Use the periodic table (not any tables or charts in your book) to predict which element has
the largest atomic radius.
A. Na
B. He
C. Li
D. Ca
24. Look at the pictures and find out the correct sequence in the given table.
W
A
B
C
D
Mixture
Molecule of
Elements
X
Z
W
Z
Y
X
X
W
X
Y
Z
Molecule
of
compounds
Z
Y
Y
X
25. Which is TRUE about the compounds formed by reacting a Halogen (X) with hydrogen gas?
A. the liquid will be a good electrical conductor
B. the reaction is given by the equation: H + X ==> HX
C. they will have a low melting and boiling point
D. in water form an alkaline solution of pH 14
26. Which statement is correct, about the diffusion of one gas into another?
A. Once the gases are fully mixed, the particles stop moving.
B. The particles of both gases continue moving in a random way.
C. The heavier gas sinks to the bottom of the mixture.
D. The gases combine to form a new product.
27. You are asked to prepare copper II sulphate by using copper oxide and sulphuric acid Which set of apparatus
will you need?
A. Pipette , test tube, china dish
B. Burette , balance, stop watch
C. Test tube, meter scale, balance
D. Pipette, balance, thermometer
28. Which diagram represents the structure of the metal sodium?
A
B
C
D
29. The tables shows the properties of four compounds.
Which compound could be sulphuric Acid?
Compound
Degree of ionization
in water
A
B
C
D
High
High
Low
Low
addition of an aqueous
solution of the compound
to magnesium
hydrogen produced
no reaction
hydrogen produced
no reaction
30. Salts are made by reacting acids with bases.
For which combination of acids and bases is the titration method of preparation
suitable?
A an insoluble acid with an insoluble base
B an insoluble acid with a soluble base
C a soluble acid with an insoluble base
D a soluble acid with a soluble base
Section A
Answer all the questions in this section in the spaces provided.
The total mark for this section is 35
A1 Choose from the following elements to answer the questions below.
Argon
bromine
carbon
hydrogen
iodine
iron
neon
sulphur
sodium
diamond
Each element can be use used once, more than once, or not at all.
Name an element which
(a) Forms an alkali when reacts with water.
____________________________________________________________________[1]
(b) a liquid at room temperature and pressure.
_____________________________________________________________________[1]
(c) Reacts with aqueous copper sulphate and displaces copper
____________________________________________________________________[1]
(d) Forms during the reaction of acids and metals.
____________________________________________________________________[1]
(e) Has a giant molecular structure.
____________________________________________________________________[1]
(f) A non-metal which conducts electricity.
____________________________________________________________________[1]
(g) Forms an ion that carries a negative charge.
_______________________________________________________________________[1]
A2. During an experiment aqueous sodium hydroxide is added from a burette into 25.0 cm3 of dilute
sulphuric acid. The pH value of the mixture during the addition of the sodium hydroxide was measured.
(a) Describe how the pH value changes.
[1]
(b) Give a chemical equation to represent the neutralisation reaction between sodium hydroxide and
sulphuric acid.
[1]
_________________________________________________________________________________
(c) Sulphuric acid is a strong acid.
(i) What is meant by the term acid?
[1]
_________________________________________________________________________________
(ii) What is the difference between a strong acid and a weak acid?
[2]
_____________________________________________________________________________________
_____________________________________________________________________________________
____________________________________________________________________
A3. Iron is one of the most important metals. It is a transition element.
(a) Explain, in terms of metallic bonding, why iron is a good electrical conductor.
[2]
(b) When underwater, iron pipes will rust relatively rapidly.
(i) State the essential conditions needed for the rusting of iron.
[2]
(c) Most iron is used in the alloy steel. Define the term Alloy
[1]
__________________________________________________________________________
(d) Write two typical properties that are generally common only to transition elements. [2]
1.________________________________________________________________________
2.________________________________________________________________________
A4.The structure of sodium chloride is drawn below.
(a) Sodium chloride is an ionic solid. Draw the electronic structure of both a sodium ion and a chloride
ion.
sodium ion
chloride ion
[2]
(b) Sodium chloride has a melting point of about 801 °C. Explain why sodium chloride has a high
melting point
[2]
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
(c) Magnesium oxide, MgO, has a similar structure to sodium chloride. Suggest why the melting point
of magnesium oxide is higher than that of sodium chloride.
[2]
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
(d) Explain why?
[4]
(i)
Solid sodium chloride will not conduct electricity but molten sodium chloride will.
___________________________________________________________________________
___________________________________________________________________________
(ii)
Crystal of sodium Chloride is brittle.
___________________________________________________________________________
___________________________________________________________________________
A5.A student added 150 cm3 copper oxide to 100 cm3 of Sulphuric Acid. A salt copper sulphate was
produced.
(a) Describe the colour of that salt.
[1]
__________________________________________________________________________________
(b) How could the salt be extracted from the mixture?
[1]
_____________________________________________________________________________________
_____________________________________________________________________________________
(c)Write a chemical equation for this reaction:
_____________________________________________________________________________________
Calculate the molecular mass of:
(i)
(ii)
(iii)
(iv)
Copper Oxide
____________________________________________________________________
sulphuricAcid
____________________________________________________________________
Copper Sulphate
____________________________________________________________________
Water
_____________________________________________________________________
(Ar: copper: 63, Sulpher: 32,hydrogen :1,oxygen:16)
[4]
Section B
Answer two questions from this section.
The total mark for this section is 20
B 6. Part of the reactivity series of metals is shown below.
Most reactive
1
2
3
4
5
6
Potassium
Sodium
Calcium
Aluminum
Zinc
Lead
Least reactive
Use the information above.
i.
Which two metals would react with calcium chloride in a displacement reaction? [2]
a._________________
b._________________
ii.
iii.
Write down symbol equations for the above displacement reactions:
[2]
a._________________________________________________________________________
b._________________________________________________________________________
What does Displacement reaction mean?
[2]
__________________________________________________________________________
__________________________________________________________________________
IV Complete the sentences using the words below:
[4]
reactive series equation ores
a. Metal __________ are natural compounds.
b. A reactivity _____________shows how the properties of metals compare.
c. A _______________shows what happens in a chemical reaction.
d. Some metals are more _____________than others.
B 7. Read the information mentioned in the table and write down the answers of the questions given below:
Substances Shape
Size
Compressibility
Flow
A
Definite
Definite
No
No
B
Indefinite
Indefinite
Yes
Yes
C
Indefinite
Definite
No
Yes
I.
Identify substance B and tell about the energy possessed by the particles of substance B?
[2]
______________________________________________________________________________
II.
Keeping in mind the shape and size, describe the arrangement of particles in substance A? [2]
______________________________________________________________________________________
______________________________________________________________________
III.
Draw particle model of substance C
[2]
IV.
V.
Which substance has the highest rate of diffusion?
___________________________________________________ ______________________ [1]
Explain your answer of part IV in term of Kinetic Particle Theory
___________________________________________________________________________[3]
___________________________________________________________________________
___________________________________________________________________________
B9 The carbonates of many metallic elements give out a gas when reacts with acids.
(a) Name the gas produced during the reaction.
_______________________________________________________________________[1]
(b) Describe a chemical test for this gas.
_______________________________________________________________________[2]
(c) Write the equation for the reaction of calcium carbonate and sulphuric acid.
_______________________________________________________________________[1]
(d) Lime can control the acidity in soil. Why? Explain in terms of neutralization.
________________________________________________________________________[2]
________________________________________________________________________
(e) Name one product that forms when it is used.
________________________________________________________________________[1]
(f) Write general equation of neutralization.
________________________________________________________________________[1]
(g) Cite one difference between bases and alkalis.
________________________________________________________________________[1]
(h) Name the salts forms during the reaction of a lime with Hydrochloric Acid
________________________________________________________________________[1]