Experimental design — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

25 Sulfuric acid is manufactured by the Contact process. Which conditions are used in this process? A 2 atmospheres pressure and a vanadium pentoxide catalyst B 2 atmospheres pressure and an iron catalyst C 200 atmospheres pressure and a vanadium pentoxide catalyst D 200 atmospheres pressure and an iron catalyst

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2018

14 Which method is used to assess the purity of an unknown solid substance? A Measure its density. B Measure its electrical conductivity. C Measure its melting point. D Measure its solubility in water.

1 marks

Answer: C

This question in 0654/23 May/June 2019

14 Which property of a substance is used to determine that it is pure? A colour B melting point C pH D shape of the crystals

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2019

21 Three methods for investigating rates of reaction are listed. 1 Observe a colour change. 2 Use a gas syringe. 3 Use a balance. The equation for the reaction of magnesium and dilute hydrochloric acid is shown. Mg(s) + 2HCl (aq) → MgCl 2(aq) + H2(g) Which of the methods can be used to investigate the rate of this reaction? A 2 only B 1 and 2 C 1 and 3 D 2 and 3

1 marks

Answer: D

This question in 0654/23 May/June 2020

24 The Haber process is used to make ammonia. Which row shows the conditions used in this process? temperature pressure catalyst / C / atm A Fe 250 450 B Fe 450 250 C V2O5 250 450 D V2O5 450 250

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2020

25 The Contact process is used to manufacture sulfuric acid. Which statement about the Contact process is not correct? A A nickel catalyst is used. B Sulfur dioxide reacts with oxygen to form sulfur trioxide. C Sulfur burns to form sulfur dioxide. D Sulfur trioxide dissolves in concentrated sulfuric acid to form oleum.

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2020

15 Carbon dioxide is produced in a reaction. It is collected in a gas syringe. The readings on the gas syringe are shown. reading / cm3 initial 7 final 43 What is the mass of carbon dioxide gas produced? A 0.0015 g B 0.0018 g C 0.0660 g D 0.0788 g

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2021

18 Calcium carbonate reacts with dilute hydrochloric acid. The equation for this reaction is shown. CaCO3 + 2HCl  CaCl 2 + H2O + CO2 Three methods for investigating rates of reaction are listed. 1 observing a colour change 2 measuring gas volume 3 measuring mass Which methods are suitable for investigating the rate of this reaction? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2021

14 Which piece of apparatus is used to measure the change in the volume of a liquid most accurately? A B C D

1 marks

Answer: C

This question in 0654/22 May/June 2022

25 Which statements about the Contact process are correct? 1 An iron catalyst is used. 2 Oleum is added to water. 3 Sulfur dioxide is converted to sulfur trioxide. 4 Sulfur trioxide is reacted with water. 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 2022

14 An aqueous salt solution contains an insoluble impurity. Which processes are used to obtain pure salt crystals? A distillation then crystallisation B distillation then chromatography C filtration then crystallisation D filtration then chromatography

1 marks

Answer: C

This question in 0654/21 May/June 2023

19 The rate of reaction between calcium carbonate and dilute hydrochloric acid is determined either by measuring the change in gas volume per unit time or by measuring the change in mass per unit time. Which piece of apparatus must be used for both methods? A a balance B a gas syringe C a stop-clock D a thermometer

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2023

14 The initial and final readings on a sensitive thermometer used in an experiment are shown. °C 22 °C 30 21 29 initial final What is the temperature change for this experiment? A 0.4 B 4.0 C 6.8 D 7.6

1 marks

Answer: D

This question in 0654/21 May/June 2024

17 When dilute hydrochloric acid reacts with calcium carbonate, carbon dioxide is produced. Which pieces of apparatus are used to investigate the effect of temperature on the rate of this reaction? 1 2 3 A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 0654/23 May/June 2024

15 An experiment is assembled to measure the rate of reaction between limestone and hydrochloric acid. In the experiment a gas is released. The volume of gas produced is measured every five seconds. Which piece of apparatus cannot be used to measure the volume of gas? A burette B measuring cylinder C pipette D gas syringe

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2024

18 The rate of a reaction that produces carbon dioxide gas is investigated. Which piece of apparatus gives the least accurate measurement for the gas production? A burette B gas syringe C measuring cylinder D 3-decimal-place digital balance

1 marks

Answer: C

This question in 0654/22 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

19 Zinc sulfate is a soluble salt. Zinc sulfate is prepared by reacting zinc with dilute sulfuric acid. Which statement about this preparation is correct? A Excess dilute sulfuric acid is used and after the reaction has finished the unreacted acid is removed by evaporation. B Excess dilute sulfuric acid is used and after the reaction has finished the unreacted acid is removed by adding an aqueous base. C Excess zinc is used and after the reaction has finished the unreacted zinc is removed by filtration. D Excess zinc is used and after the reaction has finished the zinc sulfate is purified by distillation.

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2025