SA_test_1

Tem

pera

ture

/ ºC

Self-assessment practice test 1 1© Cambridge University Press IGCSE Chemistry

Self-assessment practice testsTest 1 – Material from Chapters 2–4 | 45 minutes

1 The kinetic theory suggests different arrangements for the atoms or molecules in the three states of matter. The diagrams below show how evidence suggests the particles are arranged in the three states of matter.

1 2 3

What are the three states shown?

1 2 3

A gas liquid solid

B liquid gas solid

C solid liquid gas

D liquid solid gas

2 The graph shows the heating curve for a metal that is solid at room temperature (25 °C). The metal has been heated until it turns to

vapour.

D

C

B

A

Time

Which part of the graph represents the period of time when the metal is melting?


3 This diagram shows ice cubes floating on the surface in a glass offizzy drink.

ice cubes

glass drink

bubbles

In which of these are the particles close together but free to move past each other?

A bubblesB glassC drinkD ice cubes

4 A student wanted to obtain a pure sample of water from seawater.Which apparatus could he use to do this?

A B C D

5 Separating sand from salt is a commonly used demonstration of the first stages of a purification process. The diagram shows the first step

in the process.

What is the next step?

stirring rod

water

sand and salt

A filter the mixture B carry out chromatographyC evaporate the water D freeze the mixture


6 Coloured sweets contain edible dyes. These dyes can be separatedby chromatography. The diagram shows results obtained from three different orange sweets.

red red

yellow yellow yellow

red red

sweet 1 sweet 2 sweet 3

How many different red dyes were present in these orange sweets?

A 4 B 3 C 2 D 7

7 Which of the diagrams shows the process of diffusion?

A

B

C

D

key

different atoms

8 The diagram below shows one of the changes of physical state.Which change of state is shown?

A boiling B condensationC sublimation D melting

48


9 Some people are sitting round a dinner table to have a meal together.

It was a special meal and when the lid of the dish was removed, all the people could smell the appetising food.

How did the smell reach them when the lid was lifted?

A by decompositionB by diffusionC by distillationD by decolorisation

10 The structure of an atom is defined by two numbers: the proton number and the nucleon number. What is the electronic structure of an atom with proton (atomic) number 5 and nucleon (mass) number 11?

A 2,8,1 B 3,2 C 2,3 D 1,8,2

11 Cadmium is an element that has several isotopes. One of these isotopes is 112 Cd. Which particle is another isotope of cadmium?

Protons Neutrons

A 48 62

B 48 112

C 112 48

D 62 48

12 Two of the subatomic particles that make up an atom are the proton and the electron. What are the electrical charges on a proton and an electron?

Proton Electron

A neutral negative

B positive negative

C negative positive

D neutral positive


13 An atom of any element must contain equal numbers of the following:

A electrons, neutrons and protons.B electrons and protons. C neutrons and protons. D electrons and neutrons.

14 Naturally occurring hydrogen consists of two different isotopes.

These are 1H and 2H. Which diagram shows the arrangement of1 1

particles in the two isotopes?

1 21

H 1

H

Key

e e e

A P

= an electron

P P P

= a proton

n = a neutron e

p pB

n n = nucleus

e e

C P P

n

e e

D n p

e

15 The diagram shows part of the Periodic Table. Which of the four elements shown is a non-metal?

A B

C

D


16 The diagram shows one of the ways of representing an atom,in this case an atom of element X.

Key

electron

nucleus

To which group of the Periodic Table does X belong?

A 2 B 0 C 3 D 6

17 There is a link between the electron arrangement of an atomand its position in the Periodic Table. The table below shows the electronic structures of four elements.

Which element is a noble gas?

Element Number of electrons

Shell 1 Shell 2

A 2 0

B 2 2

C 2 6

D 1 0

18 The reactivity of elements within a group in the Periodic Table changes with their position in the group.

What is the order of increasing reactivity of the elements inGroup I and in Group VII?

Group I Group VII

A Cs → Li F → I

B Li → Cs I → F

C Li → Cs F → I

D Cs → Li I → F

V X

Y


19 The diagram shows an outline of the Periodic Table with certainelements marked.

W

Which of the elements V, W, X or Y is a metal and which is a non-metal?

Non-metal Metal

A Y V

B Y X

C W X

D W V

20 Elements in the same group of the Periodic Table have similar properties. Element X is a colourless, unreactive gas.

Which group of the Periodic Table is X in?

A Group VI B Group IC Group 0 D Group VII

21 The structure of any atom is essentially defined by two numbers. How many protons, neutrons and electrons are present in an atom of the element with proton (atomic) number 6 and nucleon (mass) number 14?

Protons Neutrons Electrons

A 6 8 6

B 8 6 6

C 6 8 8

D 8 6 8

22 Metals usually form compounds involving ionic bonding.How do metals form their ions?

A by gaining protons B by gaining electronsC by losing electrons D by losing protons

23 Chlorine is a highly reactive non-metal. What particles are gained by chlorine when it reacts with potassium?

A protons B electronsC atoms D ions


24 There are various different types of structure that compounds can form, depending on the nature of their bonding. A substance has an

ionic structure that can be represented as shown.

– + – +

– + – +

What could the substance be?

A iodine B waterC potassium bromide D diamond

25 The boiling point of a substance is linked to the type of bonding present in the substance. Two elements X and Y combine to form a liquid with the relatively low boiling point of 120 °C.

Which of the lines in the following table is correct?

Type of element Type of bonding

X Y

A metal metal covalent

B non-metal non-metal ionic

C non-metal non-metal covalent

D metal non-metal ionic

26 Some non-metallic elements form covalent simple molecular structures involving a number of atoms. Phosphorus is one of these, forming the molecule P4. The diagram shows this covalent molecule

of phosphorus.

How many electrons in total are shared in the bonds in this molecule?

A 12 B 8 C 4 D 2

27 Which of the following elements exists as a giant covalent structure?

A carbon B iodine C helium D oxygen


28 Covalent bonding involves electrons being shared between the atoms bonded together. Methane is made up of covalently bonded molecules.

Which diagram represents the bonding in methane?

A B

C

C H C H C H

CKey

electronfrom carbon

C D electron from hydrogen

H H

H C H H C H

H H

29 A gas is made up of simple molecules that have the formula NOCl.

Which of the following diagrams shows the molecules of this gas, NOCl?

A B C D

30 Methane is the simplest hydrocarbon and has the formula CH4.

Key

N Cl O

H

H C H

H

What is the total number of the electrons involved in the bonding in this molecule?

A 10 B 2 C 8 D 4

31 A chemical reaction takes place when iron filings and sulfur are mixed in a test tube and heated with a Bunsen burner. The reaction mixture continues to glow even when the Bunsen burner is removed. Which type of reaction is taking place?

A thermal decompositionB synthesisC neutralisationD precipitation


32 A word equation is shown below:

zinc + hydrochloric acid → zinc chloride + hydrogen

What is the symbol equation for this reaction?

A 2Zn + HCl → ZnCl2 + H2

B Zn + 2HCl → ZnCl2 + H2

C Zn + HCl → ZnCl2 + H2

D 2Zn + 2HCl → ZnCl2 + H2

33 The test for carbon dioxide is that it turns limewater cloudy.

Which of the following is a balanced equation for this reaction between carbon dioxide and aqueous calcium hydroxide?

A CO2 + CaOH2 → CaCO2 + H2O

B CO2 + CaOH2 → CaCO3 + H2

C CO + Ca(OH)2 → CaCO2 + H2O

D CO2 + Ca(OH)2 → CaCO3 + H2O

34 A pink crystalline compound was heated as shown.

steam

pink compound

heat

When heated, the solid changed colour from pink to blue and steam was driven off. After the tube had cooled down, water was added to

the contents of the test tube and the pink colour returned. Which term describes the change that took place?

A reversibleB crackingC neutralisationD combustion

35 One type of chemical change is reduction. In which reaction is the underlined substance being reduced?

A CuO + C O → Cu + CO2

B C u 2O + C → 2Cu + CO

C 2 C u + O2 → 2CuO

D 2 C u 2O + O2 → 4CuO


36 Hydrogen and chlorine react together to synthesise hydrogen chloride as shown.

1 molecule of hydrogen + 1 molecule of chlorine→ 2 molecules of hydrogen chloride

What is the balanced chemical equation for this reaction?

A 2H + 2Cl → 2HClB H + Cl → HClC H2 + Cl2 → 2HCl

D H2 + Cl2 → H2Cl2

37 The equation represents a reaction between two solutions.

AgNO3(aq) + HCl(aq) → HNO3(aq) + AgCl(s)

What is the residue when the reaction mixture is filtered?

A AgCl B AgNO3 C HCl D HNO3

38 The blast furnace extraction of iron is a very important industrial reaction. The equation describing this reaction is given below:

iron(III) oxide + carbon monoxide → iron + carbon dioxide

Fe2O3 + 3CO → 2Fe + 3CO2

Which substance is reduced in the course of this reaction?

A carbon monoxideB ironC iron(III) oxideD carbon dioxide

39 In which of the following does a chemical change take place?

A distillationB evaporationC filtrationD neutralisation

40 Limestone is an important mineral resource. What is the chemical name for this mineral?

A calcium fluorideB magnesium carbonateC calcium oxideD calcium carbonate

SA_test_1

Documents

water d

d electrons

b electrons

b c d key different

mixture b

c neutrons

different red dyes

proton number