Physical and chemical changes — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

15 A student completes four experiments. Experiment 1 The student heats some ice and it melts. Experiment 2 The student heats some blue copper sulfate crystals and a white solid is formed. Steam is given off. Experiment 3 The student grinds up a lump of chalk to a powder. Experiment 4 The student heats green copper carbonate crystals and a black solid is formed. A gas is produced that turns limewater milky. Which row describes the changes in the experiments? physical changes chemical changes A 1 and 3 2 and 4 B 1 and 4 2 and 3 C 2 and 3 1 and 4 D 2 and 4 1 and 3

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2017

15 Which statement about fractional distillation is correct? A A chemical change occurs because new substances are formed. B A chemical change occurs because no new substances are formed. C A physical change occurs because new substances are formed. D A physical change occurs because no new substances are formed.

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2017

15 When solid zinc carbonate is heated, a different solid and a gas are formed. Which type of change occurs? A chemical B exothermic C physical D separation

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2017

14 Two substances, X and Y, are heated and then cooled. The observations are shown. blue heat white cool white substance X solid solid solid grey heat purple cool grey substance Y solid vapour solid Which type of change occurs when X and Y are heated? X Y A chemical chemical B chemical physical C physical chemical D physical physical

1 marks

Answer: B

This question in 0654/21 May/June 2019

15 Two substances, X and Y, are heated and then cooled. The observations are shown. blue heat white cool white substance X solid solid solid grey heat purple cool grey substance Y solid vapour solid Which type of change occurs when X and Y are heated? X Y A chemical chemical B chemical physical C physical chemical D physical physical

1 marks

Answer: B

This question in 0654/22 May/June 2019

15 Two substances, X and Y, are heated and then cooled. The observations are shown. blue heat white cool white substance X solid solid solid grey heat purple cool grey substance Y solid vapour solid Which type of change occurs when X and Y are heated? X Y A chemical chemical B chemical physical C physical chemical D physical physical

1 marks

Answer: B

This question in 0654/23 May/June 2019

15 Which processes are chemical changes? 1 conversion of steam to liquid water 2 cracking of alkanes 3 fractional distillation of petroleum 4 thermal decomposition of calcium carbonate A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2019

15 Which processes are chemical changes? 1 conversion of steam to liquid water 2 cracking of alkanes 3 fractional distillation of petroleum 4 thermal decomposition of calcium carbonate A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2019

15 Which processes are chemical changes? 1 conversion of steam to liquid water 2 cracking of alkanes 3 fractional distillation of petroleum 4 thermal decomposition of calcium carbonate A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2019

25 Which processes produce carbon dioxide? 1 acid reacting with a metal 2 respiration 3 combustion of ethanol 4 acid reacting with a metal oxide A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2019

26 What are the products of the thermal decomposition of calcium carbonate, CaCO3? A calcium and carbon dioxide B calcium, carbon and oxygen C calcium oxide and carbon dioxide D calcium oxide and carbon monoxide

1 marks

Answer: C

This question in 0654/22 May/June 2021

26 Which equation represents a thermal decomposition reaction? A CaCO3  CaO + CO2 B HCl + NaOH  NaCl + H2O C Mg + H2SO4  MgSO4 + H2 D S + O2  SO2

1 marks

Answer: A

This question in 0654/23 May/June 2021

14 Which row identifies physical changes and chemical changes? physical changes chemical changes A cooking an egg and rusting of iron ice melting B ice melting and burning wood water boiling C mixing sand and water baking a cake and water boiling D rusting of iron and solid dissolving and baking a cake ethanol evaporating

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2021

14 Which row correctly identifies the named changes? physical changes chemical changes A condensation and combustion evaporation and neutralisation B evaporation and neutralisation condensation and combustion C condensation and evaporation combustion and neutralisation D combustion and neutralisation condensation and evaporation

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2021

25 Which equation does not represent a reaction in the Contact process? A H2O + SO3  H2SO4 B H2S2O7 + H2O  2H2SO4 C S + O2  SO2 D 2SO2 + O2 2SO3

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2021

15 Three different processes are listed. 1 heating ice to form water 2 lighting a match 3 removing zinc from sodium chloride solution by filtration Which processes are physical changes? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 0654/21 May/June 2022

15 Some physical and chemical changes are listed. 1 burning methane 2 dissolving sugar in water 3 evaporating ethanol 4 rusting iron Which changes are chemical changes? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0654/22 May/June 2022

15 Which process is a chemical change? A boiling B dissolving C melting D neutralisation

1 marks

Answer: D

This question in 0654/23 May/June 2022

15 When solid zinc carbonate is heated, a different solid and a gas are formed. Which type of change occurs? A chemical B exothermic C physical D separation

1 marks

Answer: A

This question in 0654/22 May/June 2023

24 Four different reactions occur in the manufacture of sulfuric acid by the Contact process. Which substance is a reactant in one of these reactions and a product in another? A H2O B O2 C S D SO3

1 marks

Answer: D

This question in 0654/23 May/June 2023

25 Four reaction equations involving sulfur and its compounds are shown. 1 S + O2  SO2 2 SO2 + H2O  H2SO3 3 2H2SO3 + O2  2H2SO4 4 H2SO4 + SO3  H2S2O7 Which reactions take place in the manufacture of sulfuric acid by the Contact process? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2023

14 Which changes are chemical changes? 1 iron rusting 2 burning coal 3 dissolving sugar in water 4 boiling water A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: A

This question in 0654/22 Feb/March 2024

15 The boiling point of ammonia is –33 C. The temperature of a sealed flask containing ammonia is changed from –35 C to –30 C. Which row describes and explains the type of change that happens in the flask? type of change explanation A chemical no new substance is formed B chemical hydrogen and nitrogen are formed C physical no new substance is formed D physical hydrogen and nitrogen are formed

1 marks

Answer: C

This question in 0654/21 May/June 2024

19 When a match burns, heat and light energy are produced. Which row describes the type of change and the type of reaction taking place? type of change type of reaction A chemical endothermic B chemical exothermic C physical endothermic D physical exothermic

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2024

14 Which graph shows the temperature change when an impure, solid substance is heated? A B temperature temperature time time C D temperature temperature time time

1 marks

Answer: A

This question in 0654/21 May/June 2025

17 Which processes are physical changes? 1 Hydrogen gas joins with oxygen gas to form steam. 2 Liquid water turns into steam. 3 Cl 2(g)  2Cl (g) 4 CH4(l)  CH4(g) A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: C

This question in 0654/22 May/June 2025