plumiRate–concentration graphs and initial rates: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.1.1.3 Rate–concentration graphs and initial rates, 2016–2025, with mark schemes and examiner’s reports where available.
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Q18(b)
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Open the full PDFYour answerQ17(a)
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All 11 questions on Rate–concentration graphs and initial rates, as a list
- June 2025, Paper 1, Q18(b) (5 marks): The following data was obtained in a series of experiments on the rate of the reaction for Reaction 18.1 at a constant temperature. [NO] / mol dm–3 [O2] / mol d
- June 2025, Paper 3, Q3(b) (6 marks): This question is about equilibrium and rates. (b)* A reaction takes place when aqueous solutions of propanone, CH3COCH3(aq), and bromine, Br2(aq), are mixed in
- June 2024, Paper 1, Q10 (1 mark): A reaction is zero order with respect to a reactant. Which rate–concentration graph for the reactant is the correct shape? A B C D Your answer [1]
- June 2023, Paper 1, Q17 (6 marks): 17* Bromine, Br2, can be produced by the reaction: 5Br –(aq) + BrO3 –(aq) + 6H+(aq) 3Br2(aq) + 3H2O(l) A student investigates the rate of this reaction by carry
- June 2022, Paper 1, Q16(a)(ii) (5 marks): The rate of Reaction 16.1 is investigated by carrying out three experiments at the same temperature. The results are shown below. [NO(g)] [CO(g)] Initial rate E
- November 2021, Paper 1, Q21(a)(i) (2 marks): Explain how the student’s results support this rate equation. [2]
- November 2021, Paper 3, Q4(c)(ii) (2 marks): Suggest how the investigation could be modified to show that the reaction is first order with respect to pent-1-ene. [2]
- June 2019, Paper 1, Q21 (6 marks): 21* Three students carry out a rates investigation on the reaction between bromine and propanone in the presence of hydrochloric acid. CH3COCH3(aq) + Br2(aq) CH
- June 2018, Paper 1, Q8 (1 mark): A reaction is first order with respect to a reactant X. Which rate–concentration graph for reactant X is the correct shape? A B C D [1] Your answer
- June 2018, Paper 1, Q17(a) (6 marks): This question is about reaction rates. Aqueous iron(III) ions, Fe3+(aq), react with aqueous iodide ions, I–(aq), as shown below. 2Fe3+(aq) + 2I–(aq) 2Fe2+(aq) +
- June 2017, Paper 3, Q3(a)(i) (3 marks): Determine the rate equation and calculate the rate constant, k, including units. k = units [3]
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