Physical and chemical changes — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

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 0973/21 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 0973/22 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 0973/21 Oct/Nov 2019

25 Limestone is converted to lime in process 1. Limestone is used to treat industrial waste in process 2. What are processes 1 and 2? process 1 process 2 A decomposition dissolving B decomposition neutralisation C oxidation dissolving D oxidation neutralisation

1 marks

Answer: B

This question in 0973/21 May/June 2020

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 0973/22 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 0973/21 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 0973/21 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 0973/22 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 0973/22 May/June 2023

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 0973/21 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 0973/21 Oct/Nov 2024

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 0973/22 May/June 2025