Multiple Choice Practice 3
Don’t forget to cover up the suggested answers while you try to link the question to the
relevant chemistry you know.
Solutions are available – but try these before checking answers.
1.
A mixture contains 3 substances, alum, camphor and sugar. The solubilities of these
substances in different solvents are as follows.
SUBSTANCES
SOLVENTS
WATER
ETHANOL
ETHER
Alum
Soluble
Insoluble
Insoluble
Sugar
Soluble
Soluble
Insoluble
camphor
Insoluble
Soluble
Soluble
What would be the quickest way to separate the alum from the mixture?
A.
B.
C.
D.
2.
Add water to the mixture, stir and filter, and dry the residue.
Add ethanol to the mixture, stir and filter, and dry the residue.
Add ether to the mixture, stir and filter, and dry the residue.
Add water to the mixture, stir and filter, and evaporate the filtrate.
Consider the following sealed containers, each of which has a different volume and
contains 5 mL of liquid water
The container in which the water vapour exerts the greatest pressure is;
A.
B.
C.
D.
3.
1
2
3
4
If X represents an element from group II and Y represents an element from group
VII, the compound formed between these elements would be;
A.
B.
C.
D.
ionic, with formula XY2
covalent, with formula XY2
covalent, with formula X2Y
covalent, with formula XY
4.
In which of the following reactions does the first reactant act as a base?
A.

2

H3O(aq)
 S(aq)
 HS(aq)
 H2O(l )
B.
2


HPO4(aq)
 H2O  H2 PO4(aq)
 OH(aq)
C.


NH4(aq)
 OH(aq)
 NH2(aq)  H2O(l )

2

2
HSO3(aq)
 CO3(aq)
 HCO3(aq)
 SO3(aq)
 D.

5.
Three elements have the following properties.

ELEMENT
1
2
3
PROPERTY
The first is a silvery metal which when heated in air burns with a brilliant
white flame.
The second is a yellow powder which burns with a pale blue flame when
heated.
The third is a grey/black solid which, when heated, forms clouds of purple
vapour.
The three elements , in order are:
A.
B.
C.
D.
6.
Hydrogen is contained in two vessels by a closed stopcock as shown in the diagram.
The stopcock is opened and the gases allowed to mix. The final pressure (neglecting
the volume of the tube between the bulbs) will be;
A.
B.
C.
D.
7.
0.5 atm
0.67 atm
0.75 atm
1.50 atm
Evaporation from a liquid results in;
A.
B.
C.
D.
8.
sodium, sulfur and bromine
magnesium, sulfur and iodine
magnesium, phosphorus and bromine
sodium, phosphorus and iodine
an increase in the temperature of the liquid.
an increase in the boiling point of the liquid.
a decrease in the average velocity of the molecules of the liquid.
an increase in the total energy of the molecules within the liquid.
Select the graph that represents the relationship between the pressure (P) and the
number of moles (n) of an ideal gas, when the volume and temperature are
constant.
9.
Which of the following statements is FALSE?
A. At constant temperature, if the pressure of a gas is increased the average kinetic
energy of the gas molecules increase correspondingly.
B. When different gases are at the temperature, the molecules of the gases have the
same average kinetic energy.
C. Molecules of a gas travel in random, straight line motion, colliding with each other
an with the walls of the container.
D. The volume occupied by gas molecules is almost negligible compared with the
volume of the container.
10.
The curves in the following diagram represents the energy distribution for the
same gas sample under two different sets of conditions A and B.
Which one of the following statements about A and B is TRUE?
A.
B.
C.
D.
11.
The average Kinetic energy of the molecules under condition A is greater that
under condition B. A and B correspond to the same temperature but different
volumes.
The temperature of B is greater than for A.
A and B correspond to the same volumes, but the pressure for A is greater than
the pressure for B.
The intermolecular attractive forces are greater for A than for B.
A solid has a high melting point and is a non-conductor of electricity when both
molten and solid. The type of bonding found it this solid would be;
A.
B.
C.
D.
12.
ionic
covalent molecular
metallic
covalent network
a sample of oxygen gas was collected in a plastic bag. It was determined that there
was 0.80 g of oxygen in the bag. The bag was then emptied and refilled with an
unknown gas A, under identical conditions of temperature and pressure. The mass
of the sample was 2.2 g. Which of the following statements about the relative
molecular mass of A is True?
A.
B.
C.
D.
It is 88
It is 44
It is 22
It is 11