National 5 Chemistry

Prelim Revision 3

Unit 1 Chemical Changes and Structure

Unit 2 Nature’s Chemistry

Unit 3 Chemistry in Society (Polymers)

CfE N5

UNIT 1 Chemical Changes and Structure

Multiple Choice

1. 4.

5.

2.

6.

3. 7.

8.

In a reaction, 60cm3 of gas were collected in 20s.

The average rate at which gas was given off, in cm3 s-1, was

A

B

C

D

Which of the following substances has the smallest gram formula mass?

A CO

B CO2

C N2

D CH4

Atoms of an element form ions with a single positive charge and an electron arrangement of 2,8

The element is

A fluorine

B lithium

C sodium

D neon

Which of the following statements is true?

A The products have less energy than the reactants

B The temperature of the reaction mixture will fall

C Energy is given out to the surroundings

D The reaction is exothermic

The diagram shows the energy change during a chemical reaction

Which line in the table describes a neutron?

Solid ionic compounds do not conduct electricity because

A the ions are not free to move

B the electrons are not free to move

C solid substances never conduct electricity

D there are no charged particles in ionic compounds.

What is the charge on the zinc ion in the compound zinc phosphate, Zn3(PO4)2?

A 2+

B 3+

C 2-

D 3-

Mass Charge

A 1 -1

B Negligible 0

C 1 +1

D 1 0

8. 10.

9.

. UNIT 2 Nature’s Chemistry

Multiple Choice

11.

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 represents a compound made of diatomic molecules?

Which of the following diagrams could be used to represent the structure of sodium chloride?

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. 14.

13.

15.

The shortened structural formula for an organic compound is

CH3CH(CH3)CH(OH)C(CH3)3

Which of the following is another way of representing this structure?

Which of the following molecules is an isomer of hept-2-ene?

The name of the above compound is A 2-ethylpropane

B 1,1-dimethylpropane

C 2-methylbutane

D 3-methylbutane

Process X

C8H18 Ethene + Compound Y

Which line in the table correctly identifies Process X and Compound Y?

Process X Compound Y

A Cracking Hexene

B Cracking Hexane

C Distillation Hexene

D Distillation Hexane

16. 19.

17.

20.

18.

The structural formula for hydrocarbon X is:

Which of the following statements about Hydrocarbon X is true? A X is named but-2-ene B X is a saturated hydrocarbon C X rapidly decolourises bromine solution D X belongs to the group of hydrocarbons with

The general formula CnH2n+2.

Three members of the cycloalkene homologous series are:

The general formula for this homologous series is

A CnH2n+2

B CnH2n

C CnH2n-2

D CnH2n-4

Methanol + ethanoic acid methyl ethanoate + water This reaction is an example of

A addition B dehydration C condensation D neutralisation

The above molecule is an example of A a saturated alcohol

B an unsaturated alcohol

C a saturated carboxylic acid

D an unsaturated carboxylic acid

Gasoline produced by the fractional distillation of crude oil has a low viscosity.

Which of the following properties also applies to gasoline? 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

Unit 3 Chemistry in Society

Polymers - Multiple Choice

21.

22.

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

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.

(3)

What is meant by a base?

base.

4.

(2)

5.

(3)