Rate of reaction: past paper questions
Real questions on rate of reaction
The newest 20 of 116 written questions. Open one to see it on the real paper.
- 0971/32 · May/June 2026 · Q3b(iv)[1]
State how the rate of reaction differs, if at all, when a higher temperature is used.
See it on the paper → - 0971/32 · May/June 2026 · Q3b(v)[1]
State how the rate of reaction differs, if at all, when a lower concentration of dilute sulfuric acid is used.
See it on the paper → - 0971/62 · May/June 2026 · Q2c(i)[1]
Calculate the mean rate of reaction in Experiment 3. Give units for the mean rate you have calculated.
See it on the paper → - 0971/62 · May/June 2026 · Q2d[1]
Use your graph in Figure 2.2 to predict the volume of gas collected in 75 seconds if the volume of distilled water is 77 cm®. Show your working on Figure 2.2.
See it on the paper → - 0971/62 · May/June 2026 · Q2f(ii)[75]
(ii) Deduce in which experiment the most gas would escape. Explain your answer. EXPELIMENE .......... .......... .......... EOXPlAMAtION .......... ..........
See it on the paper → - 0971/62 · May/June 2026 · Q2g[1]
Sketch a line on Figure 2.2 to show the results that would be obtained if the experiment is repeated with 20.0cmé of dilute ethanoic acid instead of 10.0cm?.
See it on the paper → - 0971/32 · October/November 2025 · Q8b(i)[1]
the time taken for the reaction to finish
See it on the paper → - 0971/31 · May/June 2025 · Q4d(i)[2]
State two conditions for fermentation. Ethanol is manufactured by fermentation of aqueous glucose.
See it on the paper → - 0971/31 · May/June 2025 · Q5a(ii)[2]
One way the student can increase the rate of the reaction in the experiment is to use a higher concentration of acid. State two other ways to increase the rate of this reaction.
See it on the paper → - 0971/32 · May/June 2025 · Q2a(ii)[1]
The total mass of compounds formed from 500 cm 3 of sea water is 12.0 g. Calculate the total mass of compounds formed from 750 cm 3 of sea water. mass = g (ii)
See it on the paper → - 0971/32 · May/June 2025 · Q6a(ii)[2]
The student wants to decrease the rate of the reaction in the experiment. State two ways to decrease the rate of this reaction.
See it on the paper → - 0971/41 · May/June 2025 · Q3c(vi)[2]
Step 1 is repeated using sulfuric acid of concentration 0.200 mol / dm 3 instead of 0.100 mol / dm 3 . All other conditions are the same. The rate of reaction increases. Explain why the rate of reaction increases. Give your answer in terms of particles.
See it on the paper → - 0971/41 · May/June 2025 · Q6e(i)[2]
Give two observations when sodium is added to water.
See it on the paper → - 0971/42 · May/June 2025 · Q6d(ii)[3]
Explain, in terms of collision theory, why the rate of the forward reaction increases if the temperature increases.
See it on the paper → - 0971/61 · May/June 2025 · Q2a[1]
Use the stop-watch diagrams to complete Table 2.1 Table 2.1 concentration of acid in mol / dm 3 acid stop-watch diagram 0 seconds 0 1 A 2.0 45 15 time for magnesium to disappear in s 5 experiment 15 minutes 10 30 0 seconds 0 B 1.5 45 15 5 15 minutes 10 2 30 0 seconds 0 3 C 1.0 45 15 5 15 minutes 10 30 0 4 D 0.8 45 15 5...
See it on the paper → - 0971/61 · May/June 2025 · Q2b[1]
Write a suitable scale on the y-axis and plot the results from Experiments 1 to 5 on Fig. 2.1. Draw a line of best fit. time for magnesium to disappear in s 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 concentration of acid in mol / dm 3
See it on the paper → - 0971/61 · May/June 2025 · Q2c[2]
From your graph in Fig. 2.1, deduce the time for the magnesium to disappear when the concentration of the acid is 1.3 mol / dm 3 . Show clearly on Fig. 2.1 how you worked out your answer. time for magnesium to disappear = s
See it on the paper → - 0971/61 · May/June 2025 · Q2d(i)[1]
Calculate the mean rate of reaction in Experiment 1. Give units for the rate you have calculated. mean rate of reaction =
See it on the paper → - 0971/61 · May/June 2025 · Q2d(ii)[1]
Deduce in which Experiment, 1, 2, 3, 4 or 5, the mean rate of reaction is the slowest.
See it on the paper → - 0971/61 · May/June 2025 · Q2f(ii)[1]
Explain why controlling the temperature of the acid so that it remains constant is an improvement.
See it on the paper →
What examiners said
Similarly to Question 5(b)(i), ‘temperature’, ‘pressure’ and ‘catalyst’ were all insufficient to answer the question. Some candidates confused fermentation with the catalytic addition of steam to ethene.
— Examiner report, May/June 2025, 0971/31 Q4(d)(i) (Cambridge)
Most candidates answered this correctly. Similarly to the questions on reaction conditions, some candidates wrote ‘temperature’, which is ambiguous. Candidates should note that increasing the pressure for a reaction that occurs in aqueous solution does not affect rate. The reactants must be gaseous for this to be correct.
— Examiner report, May/June 2025, 0971/31 Q5(a)(ii) (Cambridge)
Several answers gave terminology such as ‘collision frequency per unit time increases’. In such cases the phrase ‘per unit time’ is unnecessary in addition to frequency. Several candidates suggested that the kinetic energy of particles increased because the concentration of the acid increased; others referred to a change in surface area. ‘The number of particles increased’ was frequently seen wi...
— Examiner report, May/June 2025, 0971/41 Q3(c)(vi) (Cambridge)
Past papers, syllabus and examiner reports © UCLES (Cambridge University Press & Assessment). Questions are matched to topics from the official syllabus. AssessPro is independent and not endorsed by Cambridge.