CfE
N5
National 5 Chemistry
Prelim Revision 3
Unit 1 Chemical Changes and Structure
Unit 2 Nature’s Chemistry
Unit 3 Chemistry in Society (Polymers)
UNIT 1 Chemical Changes and Structure
Multiple Choice
1.
4.
In a reaction, 60cm3 of gas were collected in 20s.
Which of the following substances has the smallest
gram formula mass?
The average rate at which gas was given off, in
cm3 s-1, was
A
B
A
CO
B
CO2
C
N2
D
CH4
C
D
5.
Atoms of an element form ions with a single positive
charge and an electron arrangement of 2,8
2.
The diagram shows the energy change during a
chemical reaction
The element is
A
fluorine
B
lithium
C
sodium
D
neon
6.
Which of the following statements is true?
Solid ionic compounds do not conduct electricity
because
A
The products have less energy than the
reactants
A
the ions are not free to move
B
the electrons are not free to move
B
The temperature of the reaction mixture will
fall
C
solid substances never conduct electricity
C
Energy is given out to the surroundings
D
there are no charged particles in ionic
compounds.
D
The reaction is exothermic
3.
Which line in the table describes a neutron?
Mass
A
1
B 8. Negligible
C
1
D
1
Charge
-1
0
+1
0
7.
What is the charge on the zinc ion in the compound
zinc phosphate, Zn3(PO4)2?
A
2+
B
3+
C
2-
D
3-
8.
10.
What is the name of the compound with the formula
Ag2O?
A
Silver(I) oxide
B
Silver(II) oxide
C
Silver(III) oxide
D
Silver(IV) oxide
Which of the following diagrams could be used to
represent the structure of sodium chloride?
9.
Which of the following diagrams represents a compound
made of diatomic molecules?
.
UNIT 2 Nature’s Chemistry
Multiple Choice
11.
Which of the following compounds fits the general
formula, CnH2n, and will rapidly decolourise bromine
solution?
A
Cyclopentane
B
Cyclopentene
C
Pentane
D
Pentene
12.
The shortened structural formula for an organic
compound is
14.
Which of the following molecules is an isomer of
hept-2-ene?
CH3CH(CH3)CH(OH)C(CH3)3
Which of the following is another way of representing
this structure?
13.
15.
Process X
C8H18
Ethene + Compound Y
Which line in the table correctly identifies Process X and
Compound Y?
The name of the above compound is
A
2-ethylpropane
B
1,1-dimethylpropane
C
2-methylbutane
D
3-methylbutane
A
B
C
D
Process X
Cracking
Cracking
Distillation
Distillation
Compound Y
Hexene
Hexane
Hexene
Hexane
16.
19.
Three members of the cycloalkene homologous
series are:
Gasoline produced by the fractional distillation of
crude oil has a low viscosity.
The general formula for this homologous series is
A
CnH2n+2
CnH2n
CnH2n-2
CnH2n-4
B
C
D
Which of the following properties also applies to
gasoline?
17.
Methanol + ethanoic acid
methyl ethanoate + water
This reaction is an example of
A
B
C
D
addition
dehydration
condensation
neutralisation
A
High boiling point and high flammability
B
Low boiling point and high flammability
C
High boiling point and low flammability
D
Low boiling point and low flammability
20.
18.
The structural formula for hydrocarbon X is:
The above molecule is an example of
Which of the following statements about
Hydrocarbon X is true?
A
B
C
D
X is named but-2-ene
X is a saturated hydrocarbon
X rapidly decolourises bromine solution
X belongs to the group of hydrocarbons with
The general formula CnH2n+2.
A
a saturated alcohol
B
an unsaturated alcohol
C
a saturated carboxylic acid
D
an unsaturated carboxylic acid
Unit 3 Chemistry in Society
Polymers - Multiple Choice
21.
A polythene bowl melted when placed in a hot oven.
It can be deduced that the polythene is a
A
natural thermoplastic polymer
B
nautral thermosetting polymer
C
synthetic thermosetting polymer
D
synthetic thermoplastic polymer
22.
Part of the structure of a polymer is drawn below.
The repeating unit of this polymer is
Written
1.
Results
Time (seconds)
Volume of gas
(cm3)
0
0
10
20
20
40
30
58
40
72
50
80
60
(7)
2.
(3)
3.
base.
What is meant by a base?
(3)
4.
(2)
5.
(3)