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Orders, rate equations and rate constants: OCR A‑Level Chemistry A questions

OCR A-Level Chemistry A past-paper questions on 5.1.1.1 Orders, rate equations and rate constants, 2016–2025, with mark schemes and examiner’s reports where available.

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  1. Q2(b)

    June 2023 · Paper 3

    3 marks5.1.1.1 Orders, rate equations and rate constants5.1.3.3 pH of strong and weak acids and bases
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  2. Q4(a)

    November 2021 · Paper 3

    1 mark5.1.1.1 Orders, rate equations and rate constants
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  3. Q10

    November 2020 · Paper 1

    1 mark5.1.1.1 Orders, rate equations and rate constants
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  4. Q20(a)(i)

    November 2020 · Paper 1

    1 mark5.1.1.1 Orders, rate equations and rate constants
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  5. Q21

    June 2019 · Paper 1

    6 marks5.1.1.2 Concentration–time graphs and half-life5.1.1.3 Rate–concentration graphs and initial rates
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  6. Q1(e)

    June 2019 · Paper 3

    1 mark5.1.1.1 Orders, rate equations and rate constants
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  7. Q3(a)(i)

    June 2017 · Paper 3

    3 marks5.1.1.3 Rate–concentration graphs and initial rates5.1.1.1 Orders, rate equations and rate constants
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All 7 questions on Orders, rate equations and rate constants, as a list
  1. June 2023, Paper 3, Q2(b) (3 marks): A student investigates the rate of a reaction that is 1st order with respect to hydrochloric acid, HCl (aq). The student carries out a reaction using 0.680 mol
  2. November 2021, Paper 3, Q4(a) (1 mark): Why can the order with respect to pent-1-ene be assumed to be zero in this investigation? [1]
  3. November 2020, Paper 1, Q10 (1 mark): The equation for the reaction of ICl and H2 is shown below. 2ICl (g) + H2(g) 2HCl (g) + I2(g) The rate constant k for this reaction is 1.63 × 10−6 dm3 mol−1 s−1
  4. November 2020, Paper 1, Q20(a)(i) (1 mark): Explain why the student uses a large excess of methanol in this experiment. [1]
  5. 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
  6. June 2019, Paper 3, Q1(e) (1 mark): A reaction is first order with respect to H+. At a pH of 1, the initial rate is 2.4 × 10−3 mol dm−3 s−1. What is the initial rate at a pH of 3?
  7. 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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