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1The element phosphorus burns in air and it forms a substance with the formula P4O10. What does the formula P4O10.Aa mixture of atoms of two elements

Ba mixture of molecules of two elements

Ca molecule of a compound

Dan atom of a compound

2What types of oxide are formed by magnesium and sulfur?

magnesiumsulfur

Aacidicacidic

Bacidicbasic

Cbasicacidic

Dbasicbasic

3An alloy is used for making an aircraft body.Which properties does this alloy need to have?

low densityhigh electrical conditivity

Anono

Bnoyes

Cyesno

Dyesyes

4What do the chemical symbols, N2 and Ni represent?N2Ni

Aa compounda compound

Ba compoundan element

Can elementa compound

Dan elementan element

5The metal titanium occurs naturally combined with oxygen.The table shows the combining powers of the elements in the compound.

elementsymbolcombining power

oxygenO2

titaniumTi4

What could be the formula of the compound?ATiO2BTi2OCTiO4DTi4O2

10When water is heated to 100C, it changes to steam.The steam has a larger volume than the water.Which change on heating probably explains this increase in volume?massnumber of electrons

A

B

C

D

11A Geiger counter detects radiation from radioactive sources.A radioactive source is inside a thick aluminium container as shown.

Aalpha-particles

Bbeta-particles

Cgamma-rays

Dradio waves

12An element X has a high melting point and its oxide, X2O3, is coloured.How are X and X2O3 described?XX2O3

Atransition metalacidic

Btransition metalbasic

Cnon-metalacidic

Dnon-metalbasic

13A measuring cylinder contains some water. When a stone is put in the water, the level rises.What is the volume of the stone?

A50cm3B70cm3C75cm3D125cm3

14The table shows the name and formula of four metal ores.Which of the following contain only 3 elements?nameformula

1chalcopyriteCuFeS2

2ilmeniteFeTiO3

3malachiteCu2CO3(OH)2

4wolframiteFeWO4

A1 and 3 only

B2 and 4 only

C1, 2 and 4 only

D2, 3 and 4 only

15The diagram shows a sack containing a mixture of three minerals.

Which element is not present in the mixture?Acobalt

Bcopper

Ciron

Dtin

16Which type of radiation can be stopped by a sheet of paper?

A-particles

B-particles

C-rays

DX-rays

17Samples of four different materials (A, B, C and D) are tested in the experiments shown.

The results are given in the table below for A, B, C and D respectively.Which material is a metal?materialexperiment 1experiment 2

Alamp does not lightbends

Blamp does not lightbreaks

Clamp lightsbends

Dlamp lightsbreaks

18Element X can form 4 covalent bonds. Element Y can form 2 covalent bonds.What is the simplest formula of the compound formed by X and Y?

AXY2

BX2Y

CX2Y4

DX4Y2

19Name the compound with the formula CO.ACarbon oxide

BCarbon dioxide

CCarbon oxygen

DCarbon monoxide

20Construct the chemical formula of the ionic compound formed by the following ions.Na+CO3 2-

ANa2CO3

BNa3CO3

CNa(CO3)2

DNaCO3

21Construct the chemical formula of the ionic compound formed by the following ions.Ca2+OH-ACa2OH

BCa2(OH)2

CCa(OH)2

DCa(OH)

22The chemical formulae of a chemical substance showsIthe types of atoms present in the substance

IIthe number of each type of atoms present in a molecule of the substance

IIIthe symbol of the elements in the substance

IVthe relative mass of the substance

AI and II

BII and III

CI, II, and III

DI, II, III and IV

23The chemical formula of water is H2O. what does the formula tell you about water?Iit is made up of hydrogen and oxygen atoms

IIthere are three atoms in a molecule of water

IIIthe ratio of hydrogen to oxygen is 2 : 1

IVtwo atoms of oxygen combine with one atom of hydrogen to form water

AI and II

BII and III

CI, II, and III

DI, II, III and IV

24The chemical formula for an acid that contains 2 carbon atoms, 4 hydrogen atoms and two oxygen atoms. Which could be a possible chemical formula of the acid?ACH3COOH

BC2HCOOH

CCH2COOH

DCHCOO

25Which of the following statements are true about the kinetic theory of matter?Iparticles are always moving or vibrating

IIthe speed of particles will be greater if more energy is added

IIIthe particles in liquid move faster than the particles in gas

IVthe movement of particles in liquid is mainly vibration

AI and II

BIII and IV

CI, II, and III

DI, II, III and IV

26A beaker of water soon becomes blue if a piece of blue copper (II) sulphate crystal is placed in it. This happens because

Awater dissolves copper (II) sulphate

Bcopper (II) sulphate is a conductor of electricity

Ccopper (II) sulphate is made up of minute and discrete particles

Dthe attractive force between water and copper (II) sulphate is strong

27Which of the following set up of apparatus is correct to determine the freezing point of a substance?

28The diagram shows a gas jar placed upside down on top of another gas jar containing a few drops of liquid bromine.

Brown bromine vapour was observed in both the gas jars after a few minutes. Which of the following statements best explains the observation?ABromine vaporises easily

BAir is heavier than bromine

CBromine consists of particles that are in constant motion

DBromine particles have a higher kinetic energy than air particles

29The rate of diffusion of particles is the highest in gases compared to the rate of diffusion of particles in solids and liquids because the particles in gasesAare lighter

Bare smaller

Care very far apart

Dmove at a higher speed

30Which of the following processes involves the liberation of heat energy?IFreezing

IISublimation

IIICondensation

IVEvaporation

AI and II

BII and IV

CI, II and III

DI, II, III and IV

31Which of the following processes involves the absorption of heat energy?IMelting

IISublimation

IIIBoiling

IVEvaporation

AI and II

BII and IV

CI, II and III

DI, II, III and IV

32The table shows the melting point and boiling point of two substances, X and Y.SubstancesMelting point (C)Boiling point (C)

X580

Y-130-70

Which of the following shows correctly the state of substances X and Y at room temperature?XY

ALiquidLiquid

BLiquidGas

CGasGas

DSolidGas

33Substance P exists as a liquid at a temperature of 70C. Which of the following could be the melting point and boiling point of substance P?

Melting point (C)Boiling point (C)

A80190

B75145

C-2010

D-50135

34Which of the following happens during the heating of a substance?IThe kinetic energy of its particles increases

IIThe distance between its particles increases

IIIThe forces of attraction between its particles become weaker

IVThe size of its particles increases

AI and II

BII and IV

CI, II and III

DI, II, III and IV

35Which of the following happens during the cooling of a substance?IThe kinetic energy of its particles decreases

IIThe distance between its particles decreases

IIIThe forces of attraction between its particles become stronger

IVThe size of its particles decreases

AI and II

BII and IV

CI, II and III

DI, II, III and IV

36Which of the following graphs represents the heating curve of a substance when its powder is heated till it has melted?

37Questions 37 to 39 are based on the diagram.The diagram shows the cooling curve of hot liquid naphthalene.

At which point on the curve does liquid naphthalene begin to solidify?AP

BQ

CR

DS

38At which region on the curve does naphthalene consist of a mixture of liquid and solid?APQ

BQR

CRS

DQS

39Why does the temperature remain constant at the region QR on the cooling curve?AHeat is released as the particles become smaller in size as they cool

BHeat energy us absorbed by the particles as they attract each other to form a solid

CHeat energy is reabsorbed from the surroundings by the particles to balance the heat loss to the surroundings

DHeat loss to the surroundings is exactly balanced by the heat energy released as the particles attract each other to form a solid

40In an experiment, substance X, in the solid state, is heated until it has melted completely. The liquid is then allowed to cool to room temperature. The diagram shows the graph of temperature against time for the experiment.

Which part of the graph shows that the process of melting is taking place?

AP

BQ

CR

DS