0620...0620 Article No.712 Paper-2 (Classified/Topical MCQ’s) (2009-2019) Features: All Variants Classified to subtopics Mark schemes included References of repeated questions added

0620

Article No.712

Paper-2

(Classified/Topical MCQ’s) (2009-2019)

Features:

All Variants Classified to subtopics Mark schemes included References of repeated questions added Questions order from new to old Unsolved

Editor:

M. Luqman GreenHall, Aitchison

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Title Chemistry IGCSE Paper-1 Classified MCQ’s (Article# 712)

Published by Read & Write Publications

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CONTENTS

UNIT 1 The Particulate Nature Of Matter ------------------------------------------------------------- 3

1.1 The particulate nature of matter --------------------------------------------------------------- 3 Answers Section ------------------------------------------------------------------------------------ 14

UNIT 2 Experimental Techniques ------------------------------------------------------------------------ 15

2.1 Measurement --------------------------------------------------------------------------------------- 15 2.2 Purity --------------------------------------------------------------------------------------------------- 16

Answers Section ------------------------------------------------------------------------------------ 31

UNIT 3 Atoms, Elements And Compounds ------------------------------------------------------------ 32

3.1 Atomic structure and the periodic table ------------------------------------------------------ 32 3.2 Ions and ionic bonds -------------------------------------------------------------------------------- 46 3.3 Molecules and covalent bonds ------------------------------------------------------------------ 52

3.4 Macromolecules ------------------------------------------------------------------------------------ 60

3.5 Metallic bonding ------------------------------------------------------------------------------------ 64

Answer Section ------------------------------------------------------------------------------------- 69

UNIT 4 Stoichiometry --------------------------------------------------------------------------------------- 70

4.1 Stoichiometry ---------------------------------------------------------------------------------------- 70 4.2 The mole concept ----------------------------------------------------------------------------------- 75

Answers Section ------------------------------------------------------------------------------------ 79

UNIT 5 Electricity And Chemistry ------------------------------------------------------------------------ 80

5.1 Electricity and chemistry -------------------------------------------------------------------------- 80 Answers Section ------------------------------------------------------------------------------------ 106

UNIT 6 CHEMICAL ENERGETICS --------------------------------------------------------------------------- 107

6.1 Energetics of a reaction --------------------------------------------------------------------------- 107 6.2 Energy transfer -------------------------------------------------------------------------------------- 128

Answers Section ------------------------------------------------------------------------------------ 129

UNIT 7 Chemical Reactions -------------------------------------------------------------------------------- 130

7.1 Rate (speed) of reaction --------------------------------------------------------------------------- 130 7.2 Reversible reactions -------------------------------------------------------------------------------- 145 7.3 Redox -------------------------------------------------------------------------------------------------- 154

Answers Section ------------------------------------------------------------------------------------ 160

UNIT 8 Acids, Bases And Salts ----------------------------------------------------------------------------- 161

8.1 The characteristic properties of acids and bases -------------------------------------------- 161 8.2 Types of oxides -------------------------------------------------------------------------------------- 170 8.3 Preparation of salts --------------------------------------------------------------------------------- 177 8.4 Identification ions and gases --------------------------------------------------------------------- 189

Answers Section ------------------------------------------------------------------------------------ 198

UNIT 9 THE PERIODIC TABLE ------------------------------------------------------------------------------ 199

9.1 The periodic table ---------------------------------------------------------------------------------- 199 9.2 Group properties ------------------------------------------------------------------------------------ 205 9.3 Transition elements -------------------------------------------------------------------------------- 217 9.4 Noble gases ------------------------------------------------------------------------------------------- 225

Answers Section ------------------------------------------------------------------------------------ 228

UNIT 10 Metals ------------------------------------------------------------------------------------------------- 229

10.1 Properties of metals -------------------------------------------------------------------------------- 229 10.2 Reactivity series ------------------------------------------------------------------------------------- 233 10.3 Extraction of metals -------------------------------------------------------------------------------- 247 10.4 Uses of metals --------------------------------------------------------------------------------------- 261

Answers Section ------------------------------------------------------------------------------------ 270

UNIT 11 Air And Water --------------------------------------------------------------------------------------- 271

11.1 Water and rusting ---------------------------------------------------------------------------------- 271 11.2 Air ------------------------------------------------------------------------------------------------------- 282 11.3 Nitrogen and fertilisers ---------------------------------------------------------------------------- 292 11.4 Carbon dioxide and methane -------------------------------------------------------------------- 301

Answers Section ------------------------------------------------------------------------------------ 304

UNIT 12 Sulfur -------------------------------------------------------------------------------------------------- 305

12.1 Sulfur --------------------------------------------------------------------------------------------------- 305 Answers Section ------------------------------------------------------------------------------------ 309

UNIT 13 Organic Chemistry ---------------------------------------------------------------------------------- 310

13.1 Fuels ---------------------------------------------------------------------------------------------------- 310 13.2 Alkanes ------------------------------------------------------------------------------------------------ 325 13.3 Alkenes ------------------------------------------------------------------------------------------------ 329 13.4 Carboxylic acids ------------------------------------------------------------------------------------- 340 13.5 Polymers ---------------------------------------------------------------------------------------------- 350

Answers Section ------------------------------------------------------------------------------------ 358

YEARLY PAST PAPER

May/June 2019 Paper 22 ------------------------------------------------------------------------- 359

Answers Section ------------------------------------------------------------------------------------ 369

Chemistry IGCSE Paper-2 Classified 1.1 The particulate nature of matter

Unit 1: The particulate nature of matter

1.1 The Particulate nature of matter

1. MAR 19/P22/Q1

Pure water boils at 100 C.What happens to the water particles when water boils?A They gain energy and move further apart. C They lose energy and move further apart.B They gain energy and stay close together. D They lose energy and stay close together.

2. O/N 18/P22/Q1Oxygen and fluorine are gaseous elements next to each other in the Periodic Table.Under the same conditions of temperature and pressure, oxygen diffuses ......1...... than fluorinebecause its ......2...... is less than that of fluorine.Which words correctly complete gaps 1 and 2?

3. O/N 18/P21/Q1When smoke particles are observed with a microscope they are seen to move around randomly.This is called Brownian motion.What causes Brownian motion?A diffusion of the smoke particlesB molecules in the air hitting the smoke particlesC sublimation of the smoke particlesD the smoke particles hitting the walls of the container

4. O/N 18/P23/Q1Gases are separated from liquid air by fractional distillation. The boiling points of four gases are shown.

Which gas is both monatomic and a liquid at –200 C?

3 Read & Write Publiactions


5. M/J 18/P22/Q1A gas is released at point X in the apparatus shown.

Which gas turns the damp Universal Indicator paper red most quickly?A ammonia, NH3 C hydrogen chloride, HCl

B chlorine, Cl2 D sulfur dioxide, SO2

6. M/J 18/P21/Q1A student investigated the diffusion of ammonia gas, NH3, and hydrogen chloride gas, HCl.Two sets of apparatus were set up as shown at room temperature and pressure.

The damp red litmus paper in apparatus 1 changed colour after 30 seconds.How long does it take for the damp blue litmus paper to change colour in apparatus 2?A 64 secondsB 30 secondsC 21 secondsD The blue litmus paper would not change colour.

7. M/J 18/P23/Q1Ammonia gas is reacted with hydrogen chloride gas using the apparatus shown.Solid ammonium chloride is produced.

Which statement explains why the solid ammonium chloride is formed nearer to the hydrogen chloride?A Ammonia solution is a base and hydrogen chloride solution is an acid.B Ammonia molecules diffuse more slowly than hydrogen chloride molecules.C Hydrogen chloride has a greater molecular mass than ammonia.D Hydrogen chloride moves by Brownian motion.



8. MAR 18/P22/Q1Hydrogen chloride gas, HCl, reacts with ammonia gas, NH3, to form solid ammonium chloride.The apparatus is set up as shown.After a few minutes, solid ammonium chloride forms where the two gases meet.

The experiment is repeated using hydrogen bromide, HBr, in place of hydrogen chloride.How far along the tube does the solid ammonium bromide form?

9. MAR 18/P22/Q2

Substance L melts at –7 C and is a brown liquid at room temperature.Which temperature is the boiling point of pure L?

A –77 C B –7 C to +7 C C 59 C D 107 C to 117 C

10. O/N 17/P22/Q1The diagram shows the arrangement of particles in the three states of matter.

Solid carbon dioxide (dry ice) sublimes to gaseous carbon dioxide.Which row describes the initial and final states?

11. O/N 17/P21/Q1Which process causes the greatest increase in the distance between particles?A condensation B freezing C melting D sublimation



12. O/N 17/P23/Q1Which statement describes sublimation?A Particles moving slowly past each other speed up and move further apart.B Particles vibrating next to each other become mobile and move slowly past each other.C Particles vibrating next to each other start to move rapidly and move further apart.D Rapidly moving particles slow down and move closer together.

13. M/J 17/P22/Q1, M/J 17/P21/Q1, M/J 17/P23/Q1Small crystals of purple KMnO4 (Mr = 158) and orange K2Cr2O7 (Mr = 294) were placed at the centres of separate petri dishes filled with agar jelly. They were left to stand under the same physical conditions.After some time, the colour of each substance had spread out as shown.

The lengths of the arrows indicate the relative distances travelled by particles of each substance.Which statement is correct?A Diffusion is faster in dish 1 because the mass of the particles is greater.B Diffusion is faster in dish 2 because the mass of the particles is greater.C Diffusion is slower in dish 1 because the mass of the particles is smaller.D Diffusion is slower in dish 2 because the mass of the particles is greater.

14. M/J 17/P23/Q2

A compound, X, has a melting point of 71 C and a boiling point of 375 C.Which statement about X is correct?

A It is a liquid at 52 C and a gas at 175 C. C It is a liquid at 75 C and a gas at 350 C.

B It is a liquid at 69 C and a gas at 380 C. D It is a liquid at 80 C and a gas at 400 C.

15. MAR 17/P22/Q1A gas is released at point Q in the apparatus shown.

Which gas changes the colour of the damp Universal Indicator paper most quickly?

16. O/N 16/P22/Q1, O/N 16/P21/Q1, O/N 16/P23/Q1‘Particles moving very slowly from an area of higher concentration to an area of lower concentration.’Which process is being described?A a liquid being frozen C a substance diffusing through a liquidB a solid melting D a substance diffusing through the air



17. M/J 16/P22/Q1The particles of a substance gain energy and change from a regular ordered structure to a disordered structure with large distances between the particles.Which change of state is described?A boiling B evaporation C melting D sublimation

18. M/J 16/P23/Q1The diagram shows an experiment to demonstrate diffusion.

Which statement explains why the ring of ammonium chloride appears as shown?A Ammonia solution only produces a gas which moves until it meets the hydrochloric acid.B Both solutions produce a gas, but ammonia moves quicker than hydrogen chloride because

it is lighter.C Hydrochloric acid produces hydrogen chloride which stays at one end of the tube until the

ammonia reaches it.D The two solutions run along the tube until they meet.

19. MAR 16/P22/Q1Two gas jars are set up as shown.

The lid is removed and the gas jars are left to stand. After some time the contents of both gas jarsare brown.Which process causes this to happen?A condensation B diffusion C evaporation D filtration

20. O/N 15/P13/Q1In which process do particles move closer together but remain in motion?A condensation B diffusion C evaporation D freezing



21. M/J 15/P12/Q1The diagram shows a sugar lump in a cup of tea.

Which two processes must happen to spread the sugar evenly in the tea?

22. M/J 15/P11/Q1The changes that occur when a substance changes state are shown below.

Which process, W, X, Y or Z, is occurring in the following four situations?1 Butter melts on a warm day.2 Water condenses on a cold surface.3 The volume of liquid ethanol in an open beaker reduces.4 Ice forms inside a freezer.

23. M/J 15/P13/Q1A sugar cube is dropped into a hot cup of tea.The tea is not stirred.Which statement explains why the tea becomes sweet?A The heated water molecules penetrate the sugar cube.B The hot tea causes the sugar to melt.C The sugar cube dissolves and its molecules diffuse.D The sugar molecules get hot and evaporate.



24. MAR 15/P12/Q1A crystal of purple potassium manganate(VII) was added to each of the beakers shown in the diagram.

One beaker contained hot water and the other beaker contained cold water.In both beakers the purple colour of the potassium manganate(VII) spreads out.Which result and explanation are correct?

25. O/N 14/P12/Q2, O/N 14/P11/Q1 Which statement is an example of diffusion? A A kitchen towel soaks up some spilt milk.B Ice cream melts in a warm room.C Pollen from flowers is blown by the wind.D The smell of cooking spreads through a house.

26. O/N 14/P13/Q1 A few drops of perfume were spilt on the floor. A few minutes later the perfume could be smelt a few metres away.Which two processes had taken place? A distillation and condensation C evaporation and condensationB distillation and diffusion D evaporation and diffusion

27. M/J 14/P12/Q1Two gas jars each contain a different gas. The gas jars are connected and the cover slips are removed.The diagram shows what happens to the particles of the gases.

Which process has occurred?A chemical reaction B condensation C diffusion D evaporation



28. M/J 14/P12/Q2A liquid is heated until it boils.

Which result shows that the liquid in the test-tube is pure water? A Condensation forms at the top of the test-tube.B Steam is produced.C The thermometer reads 100 °C.D There is nothing left behind in the test-tube.

29. M/J 14/P11/Q1, M/J 14/P13/Q1The diagram shows the result of dropping a purple crystal into water.

Which processes take place in this experiment?

30. O/N 13/P12/Q1, O/N 13/P11/Q1 An attempt was made to compress a gas and a solid using the apparatus shown.

Which substance would be compressed and what is the reason for this?



31. O/N 13/P13/Q1 A gas jar of bromine vapour and a gas jar of air are set up as shown in diagram 1.The glass slide is removed. Diagram 2 shows the appearance of the gas jars after one hour.

Which statement explains why the bromine and air mix together?A Bromine is denser than air.B Bromine is lighter than air.C Bromine molecules moved upwards and molecules in air moved downwards.D Molecules in bromine and air moved randomly.

32. M/J 13/P12/Q1,M/J 13/P11/Q1, M/J 13/P13/Q1, M/J 10/P12/Q1, M/J 10/P11/Q1, M/J 10/P13/Q1The diagram shows a cup of tea.

Which row describes the water particles in the air above the cup compared with the water particles in the cup?

33. O/N 12/P12/Q1, O/N 12/P11/Q1 What are the processes W, X, Y and Z in the following diagram?

34. O/N 12/P13/Q1 ‘Particles moving very slowly from an area of high concentration to an area of low concentration.’Which process is being described above?A a liquid being frozen C a substance diffusing through a liquidB a solid melting D a substance diffusing through the air



35. M/J 12/P12/Q1, M/J 12/P11/Q1, M/J 12/P13/Q1Which diagram shows the process of diffusion?

36. O/N 11/P12/Q1, O/N 11/P11/Q1, O/N 11/P13/Q1In which substance are the particles close together and slowly moving past each other?A air B ice C steam D water

37. O/N 11/P12/Q7, O/N 11/P11/Q6, O/N 11/P13/Q10

Two elements, represented by and , form a compound.

Which diagram shows molecules of the compound ?

A B C D

38. O/N 10/P12/Q1, O/N 10/P11/Q1, O/N 10/P13/Q1In which changes do the particles move further apart?

A W and X B W and Z C X and Y D Y and Z

39. O/N 09/P12/Q2, O/N 09/P11/Q1Aqueous lead(II) nitrate and aqueous potassium iodide are added to a dish containing water, as shown.

A yellow precipitate forms after a few minutes.Which process occurs before the precipitate forms?

A diffusion B distillation C fermentation D filtration



40. M/J 09/P1/Q1The diagram shows how the molecules in the exhaust gases diffuse into the air.

Which statement describes what happens to these molecules next?

A The molecules fall to the ground because they are heavier than air molecules.

B The molecules go back together as they cool.

C The molecules spread further into the air.

D The molecules stay where they are.


Answers Section

C40.

A39.

D38.

C37.

D36.

C35.

C34.

C33.

B32.

D31.

B30.

D29.

C28.

C27.

D26.

D25.

C24.

C23.

B22.

B21.

A20.

B19.

B18.

D17.

C16.

A15.

D14.

D13.

C12.

D11.

C10.

C9.

A8.

C7.

A6.

C5.

A4.

B3.

A2.

A1.


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0620...0620 Article No.712 Paper-2 (Classified/Topical MCQ’s) (2009-2019) Features: All Variants Classified to subtopics Mark schemes included References of repeated questions added

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