0654.C6.2.01 — Describe the effect on the rate of reaction of: 5 Explain the effect on the rate of reaction of: (a). changing the concentration of solution: past paper questions
Real questions on 0654.c6.2.01 — describe the effect on the rate of reaction of: 5 explain the effect on the rate of reaction of: (a). changing the concentration of solution
The newest 20 of 21 written questions. Open one to see it on the real paper.
- 0973/31 · May/June 2026 · Q5b(ii)[2]
In all three reactions, 96 cm? of carbon dioxide gas is collected. Calculate the rate at which carbon dioxide gas is collected in the reaction that finished at 50s.
See it on the paper → - 0973/31 · May/June 2026 · Q5b(iii)[1]
Describe the effect, if any, on the time taken for the reactions to finish if the concentration of the hydrochloric acid is increased.
See it on the paper → - 0973/32 · May/June 2025 · Q8b(ii)[1]
The mass of the conical flask and contents decreases during the experiment. Explain why the mass decreases.
See it on the paper → - 0973/32 · May/June 2025 · Q8b(iv)[2]
State two changes to the reaction conditions that will increase the rate of reaction.
See it on the paper → - 0973/31 · October/November 2024 · Q2b(ii)[2]
The student wants to increase the rate of reaction. They do not change the particle size of the magnesium carbonate. State two changes to the reaction conditions that the student makes to increase the rate of reaction.
See it on the paper → - 0973/41 · October/November 2024 · Q8b(i)[1]
State which reaction, X or Y, uses a higher concentration of nitric acid. Use Fig. 8.1 to explain your answer. reaction explanation
See it on the paper → - 0973/41 · October/November 2024 · Q8b(ii)[2]
Determine the average rate of reaction X during the first 50 seconds. average rate = cm 3 / s
See it on the paper → - 0973/41 · October/November 2024 · Q8d[3]
The student repeats reaction Y at a higher temperature. State and explain how the rate of reaction changes. Use ideas about collisions between particles.
See it on the paper → - 0973/31 · May/June 2024 · Q2b(iii)[2]
In an experiment, magnesium reacts with dilute hydrochloric acid as shown in Fig. 2.1. magnesium dilute hydrochloric acid Fig. 2.1 State two ways of changing the dilute hydrochloric acid to make the reaction faster.
See it on the paper → - 0973/42 · May/June 2024 · Q5a(i)[1]
State which marble chips, A, B or C, are the smallest.
See it on the paper → - 0973/42 · May/June 2024 · Q5a(ii)[1]
Look at the line for marble chips B. State when the rate of reaction is the greatest. Choose your answer from the list. 0 – 30 s 30 – 60 s 60 – 90 s 90 – 120 s answer = s
See it on the paper → - 0973/31 · May/June 2023 · Q11c(iv)[2]
Increasing the temperature increases the rate of reaction. State two other ways the student can increase the rate of the reaction.
See it on the paper → - 0973/31 · May/June 2022 · Q8b(iii)[2]
The student repeats the experiment using the same mass of calcium carbonate and the same volume of dilute hydrochloric acid. Suggest two changes the student can make to their experiment to increase the rate of reaction.
See it on the paper → - 0973/32 · May/June 2022 · Q2b(iv)[2]
The rate of reaction is decreased by decreasing the concentration of the hydrochloric acid. State two other ways of decreasing the rate of this reaction.
See it on the paper → - 0973/41 · October/November 2021 · Q5c[3]
Describe and explain the effect of increasing the concentration on the rate of reaction. Explain your answer in terms of collisions between particles.
See it on the paper → - 0973/42 · May/June 2021 · Q8a[1]
Look at Fig. 8.2. State how long it takes for the tablet to fully react when the student uses hydrochloric acid with a concentration of 1.0 mol / dm 3 . time = s
See it on the paper → - 0973/41 · October/November 2020 · Q13b(iii)[2]
Explain why: • • an iron catalyst a temperature of 450 °C are used in the reaction chamber. iron catalyst temperature of 450 °C
See it on the paper → - 0973/32 · May/June 2020 · Q2b(iii)[2]
Rainwater is slightly acidic. The acid in rainwater reacts very slowly with limestone rocks. Suggest two reasons for the very slow rate of reaction between rainwater and limestone rocks.
See it on the paper → - 0973/41 · May/June 2020 · Q8c[3]
The rate of this reaction can be changed by changing the concentration of the acid. Explain the effect of changing the concentration of the acid on the rate of the reaction. Use ideas about particles.
See it on the paper → - 0973/42 · May/June 2019 · Q11b(i)[1]
Suggest the temperature in stage 2 of the Contact process.
See it on the paper →
What examiners said
It was common for candidates to suggest evaporation or dissolving as the cause of the loss in mass. Others gave vague answers about the reactants being used up. It was also common for candidates to suggest that the hydrochloric acid was turning to gas (implying evaporation) or being boiled which was not credited.
— Examiner report, May/June 2025, 0973/32 Q8(b)(ii) (Cambridge)
Candidates were not consistent in saying what the change would be. In many cases they identified a variable that they could change, for example temperature, but did not then go on to explain that they would increase the temperature. Candidates particularly struggled to explain how they would change the calcium carbonate to increase the rate of reaction. Many suggested more pieces rather than using...
— Examiner report, May/June 2025, 0973/32 Q8(b)(iv) (Cambridge)
This question was well answered. Some candidates were confused about changing the surface area and suggested decreasing the surface area.
— Examiner report, May/June 2023, 0973/31 Q11(c)(iv) (Cambridge)
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