G-Self-Assessment Test 1-IGCSE Chem CD

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

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

1 Th e kinetic theory suggests diff erent arrangements for the atoms or molecules in the three states of matter. Th e 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 Th e graph shows the heating curve for a metal that is solid at room temperature (25 °C). Th e metal has been heated until it turns to vapour.

A

B

Time

Tem

pera

ture

/ ºC

C

D

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

2Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

3 Th is diagram shows ice cubes fl oating on the surface in a glass of fi zzy drink.

glass

ice cubes

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 fi rst stages of a purifi cation process. Th e diagram shows the fi rst step in the process.

stirring rod

water

sand and salt

What is the next step?

A fi lter the mixture B carry out chromatographyC evaporate the water D freeze the mixture

3Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

6 Coloured sweets contain edible dyes. Th ese dyes can be separated by chromatography. Th e diagram shows results obtained from three diff erent orange sweets.

red

yellow yellow yellow

red

redred

sweet 1 sweet 2 sweet 3

How many diff erent 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 diff usion?

key

different atoms

A

B

C

D

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

A boiling B condensationC sublimation D melting

4Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

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 lift ed?

A by decompositionB by diff usionC by distillationD by decolorisation

10 Th e structure of an atom is defi ned 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

48Cd. 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

5Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

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 diff erent isotopes. Th ese are 11H and 21H. Which diagram shows the arrangement of particles in the two isotopes?

P

e

P

e

n

e

n

p

PP

P

e e

P

n

e

p

e

e

n

n

p

e

A

11H 1

2H

B

C

D

= an electron

Key

= a proton

= a neutron

= nucleus

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

A

D

C

B

6Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

16 Th e 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 Th ere is a link between the electron arrangement of an atom and its position in the Periodic Table. Th e 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 Th e 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 in Group 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

7Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

19 Th e diagram shows an outline of the Periodic Table with certain elements marked.

V

Y

X

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 Th e structure of any atom is essentially defi ned 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

8Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

24 Th ere are various diff erent 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 Th e 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. Th e 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 carbonB iodineC heliumD oxygen

9Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

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?

C

C

C CH

H

H

H HC

H

H

H HC

Key

electronfrom carbon

electron from hydrogen

H HC

A B

C D

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

NKey

ClO

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

HH 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 fi lings and sulfur are mixed in a test tube and heated with a Bunsen burner. Th e 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

10Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

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 Th e 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 + H2OB CO2 + CaOH2 → CaCO3 + H2

C CO + Ca(OH)2 → CaCO2 + H2OD CO2 + Ca(OH)2 → CaCO3 + H2O

34 A pink crystalline compound was heated as shown.

steam

pinkcompound

heat

When heated, the solid changed colour from pink to blue and steam was driven off . Aft er 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 + CO → Cu + CO2

B Cu2O + C → 2Cu + COC 2Cu + O2 → 2CuOD 2Cu2O + O2 → 4CuO

11Self-assessment practice test 1© Cambridge University Press IGCSE Chemistry

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 → 2HClD H2 + Cl2 → H2Cl2

37 Th e equation represents a reaction between two solutions.

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

What is the residue when the reaction mixture is fi ltered?

A AgCl B AgNO3 C HCl D HNO3

38 Th e blast furnace extraction of iron is a very important industrial reaction. Th e 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 fi ltrationD neutralisation

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

A calcium fl uorideB magnesium carbonateC calcium oxideD calcium carbonate