plumiChemical kinetics: Eduqas A‑Level Chemistry questions
Every Eduqas A-Level Chemistry exam question on PI3 Chemical kinetics, 2016–2025, with its mark scheme and examiner’s report.
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Q12(d)(iii)
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Q1(b)(i)
The whole paper ↗![June 2025 Component 3, question 1(b)(i): Use the data in the tables to deduce the rate equation for both reactions. Give your reasoning. [4] CH3(CH2)3Cl Initial concentration / mol dm–3 Experiment Ini](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-jun25-01-bi-qp.webp)
Q1(b)(ii)
The whole paper ↗![June 2025 Component 3, question 1(b)(ii): Deduce the concentration of OH– in experiment D. [1] Concentration = mol dm–3](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-jun25-01-bii-qp.webp)
Q1(b)(iii)
The whole paper ↗![June 2025 Component 3, question 1(b)(iii): Calculate the value of the rate constant, k, for the alkaline hydrolysis of CH3(CH2)3Cl. Give its unit. [3] Value of k = Unit](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-jun25-01-biii-qp.webp)
Q4(a)
The whole paper ↗![June 2024 Component 1, question 4(a): Suggest a method of measuring the rate of this reaction. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-jun24-04-a-qp.webp)
Q4(b)
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Q11(a)(i)
The whole paper ↗![June 2024 Component 1, question 11(a)(i): State the order of this reaction. Give a reason for your answer. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-jun24-11-ai-qp.webp)
Q11(a)(ii)
The whole paper ↗![June 2024 Component 1, question 11(a)(ii): The frequency factor, A, for this reaction is 1.47 × 109 s–1. Calculate the activation energy of the reaction. [3] Activation energy = kJ mol–1](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-jun24-11-aii-qp.webp)
Q2(a)(i)
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Q2(a)(ii)
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Q5(b)
The whole paper ↗![Autumn 2021 Component 1, question 5(b): Find the orders of reaction with respect to NaHCO3 and HCl and hence write the rate equation. [2] rate = .](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-oct21-05-b-qp.webp)
Q12(b)(i)
The whole paper ↗![Autumn 2020 Component 1, question 12(b)(i): At a temperature of 600 K, the value of the rate constant for the reaction catalysed by palladium is 2.58 × 104. I. Give the unit for this rate constant. [1] II](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-oct20-12-bi-qp.webp)
Q12(b)(ii)
The whole paper ↗![Autumn 2020 Component 1, question 12(b)(ii): Under certain conditions the oxidation of carbon monoxide can occur without a catalyst. The rate equation for this process is rate = k[CO][O2] Suggest a two-ste](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-oct20-12-bii-qp.webp)
Q4(a)(i)
The whole paper ↗![Autumn 2020 Component 3, question 4(a)(i): Mg(s) + H2SO4(aq) MgSO4(aq) + H2(g) [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-oct20-04-ai-qp.webp)
Q4(a)(ii)
The whole paper ↗![Autumn 2020 Component 3, question 4(a)(ii): CH3COCH3(aq) + I2(aq) CH2ICOCH3(aq) + HI(aq) [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-oct20-04-aii-qp.webp)
Q4(b)(i)
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Q4(b)(ii)
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Q14(a)(i)
The whole paper ↗![June 2019 Component 1, question 14(a)(i): Calculate the initial rate for the reaction, stating its unit. [3] Initial rate = Unit](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-jun19-14-ai-qp.webp)
Q14(a)(ii)
The whole paper ↗![June 2019 Component 1, question 14(a)(ii): Use the graph to show that the reaction is first order with respect to C2H5Br. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-jun19-14-aii-qp.webp)
All 39 questions on Chemical kinetics, as a list
- June 2025, Component 1, Q12(d)(iii) (8 marks): The reaction is first order overall and the rate depends on the concentration of the copper complex only. The rate constant for the reaction was found at four d
- June 2025, Component 3, Q1(b)(i) (4 marks): Use the data in the tables to deduce the rate equation for both reactions. Give your reasoning. [4] CH3(CH2)3Cl Initial concentration / mol dm–3 Experiment Ini
- June 2025, Component 3, Q1(b)(ii) (1 mark): Deduce the concentration of OH– in experiment D. [1] Concentration = mol dm–3
- June 2025, Component 3, Q1(b)(iii) (3 marks): Calculate the value of the rate constant, k, for the alkaline hydrolysis of CH3(CH2)3Cl. Give its unit. [3] Value of k = Unit
- June 2024, Component 1, Q4(a) (1 mark): Suggest a method of measuring the rate of this reaction. [1]
- June 2024, Component 1, Q4(b) (2 marks): The relative rate is measured using different concentrations of aqueous bromine and cyclohexene. Use the results given in the table to find the rate equation fo
- June 2024, Component 1, Q11(a)(i) (1 mark): State the order of this reaction. Give a reason for your answer. [1]
- June 2024, Component 1, Q11(a)(ii) (3 marks): The frequency factor, A, for this reaction is 1.47 × 109 s–1. Calculate the activation energy of the reaction. [3] Activation energy = kJ mol–1
- June 2024, Component 3, Q2(a)(i) (6 marks): Describe how the student should carry out the second run to complete the experiment and confirm that the reaction is first order with respect to peroxydisulfate
- June 2024, Component 3, Q2(a)(ii) (2 marks): The peroxydisulfate-iodide reaction can be catalysed by some d-block metal ions. Outline how the method described in part (i) could be modified to investigate t
- Autumn 2021, Component 1, Q5(b) (2 marks): Find the orders of reaction with respect to NaHCO3 and HCl and hence write the rate equation. [2] rate = .
- Autumn 2021, Component 1, Q7 (2 marks): A chemical reaction occurs at a temperature of 300 K with an activation energy of 54 000 J mol–1. The frequency factor, A, is 1.27 × 109 s–1. Write the Arrheniu
- Autumn 2020, Component 1, Q12(b)(i) (5 marks): At a temperature of 600 K, the value of the rate constant for the reaction catalysed by palladium is 2.58 × 104. I. Give the unit for this rate constant. [1] II
- Autumn 2020, Component 1, Q12(b)(ii) (3 marks): Under certain conditions the oxidation of carbon monoxide can occur without a catalyst. The rate equation for this process is rate = k[CO][O2] Suggest a two-ste
- Autumn 2020, Component 3, Q4(a)(i) (1 mark): Mg(s) + H2SO4(aq) MgSO4(aq) + H2(g) [1]
- Autumn 2020, Component 3, Q4(a)(ii) (2 marks): CH3COCH3(aq) + I2(aq) CH2ICOCH3(aq) + HI(aq) [2]
- Autumn 2020, Component 3, Q4(b)(i) (12 marks): One group of students studied the kinetics of the bromate/bromide reaction using the clock reaction described above. They mixed different volumes of the aqueous
- Autumn 2020, Component 3, Q4(b)(ii) (6 marks): In an extension to the original work, a group of students carried out an experiment to determine the activation energy of the bromate/bromide reaction. BrO3 –(a
- June 2019, Component 1, Q14(a)(i) (3 marks): Calculate the initial rate for the reaction, stating its unit. [3] Initial rate = Unit
- June 2019, Component 1, Q14(a)(ii) (2 marks): Use the graph to show that the reaction is first order with respect to C2H5Br. [2]
- June 2019, Component 1, Q14(b) (1 mark): Suggest why this method uses much lower concentrations of the reactants being studied than those of the other reactants involved. [1]
- June 2019, Component 1, Q14(c)(i) (1 mark): Give a reason why the concentration of water does not change. [1]
- June 2019, Component 1, Q14(c)(ii) (1 mark): The order of the reaction with respect to water is zero. Suggest how Hannah could confirm this. [1]
- June 2019, Component 1, Q14(d)(i) (1 mark): Give the unit of the rate constant. [1]
- June 2019, Component 1, Q14(d)(ii) (3 marks): The activation energy for this reaction is 89.5 kJ mol–1 and its frequency factor, A, has a value of 4.30 × 1011. Calculate the temperature used for Jamal’s exp
- June 2018, Component 1, Q14(c)(ii) (8 marks): The reaction can be followed by measuring the absorbance of the reactant in the solution at a wavelength of light of 350 nm. The dioxane solvent also absorbs a
- June 2018, Component 1, Q14(c)(iii) (6 marks): Upon heating, AIBN decomposes extremely rapidly. The rate equation for this process is as follows. rate = k[AIBN] The value of the rate constant k, can be found
- June 2018, Component 3, Q2(e)(i) (2 marks): Draw a labelled diagram of the apparatus that could be used to follow this reaction. [2]
- June 2018, Component 3, Q2(e)(ii) (2 marks): Plot the volume of nitrogen gas collected against time on the graph below. [2] 140 120 100 80 60 40 20 0 Time / min 0 5 10 15 20 25 30
- June 2018, Component 3, Q2(e)(iv) (5 marks): I. Use the graph to determine the initial rate of formation of nitrogen gas in dm3 min–1. Give your answer in standard form. [3] Initial rate = dm3 min–1 II. Ca
- June 2017, Component 1, Q16(a)(i) (2 marks): One student chose to use the data at 50 s to calculate the rate at 40 °C. Suggest and explain why this will not give an appropriate value of initial rate. [2]
- June 2017, Component 1, Q16(a)(ii) (2 marks): A second student chose to use the data at 10 s to calculate the rate. Give a reason why the percentage error at lower temperatures may be more significant. [2]
- June 2017, Component 1, Q16(b)(i) (1 mark): Give the overall order of the reaction. [1]
- June 2017, Component 1, Q16(b)(ii) (3 marks): Explain what information about the mechanism can be found from: • the overall order of reaction • the orders with respect to each reactant [3]
- June 2017, Component 1, Q16(b)(iii) (1 mark): State the Arrhenius equation. [1]
- June 2017, Component 1, Q16(b)(iv) (3 marks): The frequency factor for the reaction under these conditions is found to be 1.49 × 1011 dm3 mol−1 s−1. Use this value to calculate the activation energy of the
- June 2017, Component 3, Q6(a) (2 marks): The purpose of this experiment is to determine the activation energy (Ea) for the reaction of peroxodisulfate(VI) ions S2O8 2−(aq) with iodide ions I−(aq) using
- June 2017, Component 3, Q6(b) (1 mark): The purpose of this experiment is to determine the activation energy (Ea) for the reaction of peroxodisulfate(VI) ions S2O8 2−(aq) with iodide ions I−(aq) using
- June 2017, Component 3, Q6(c) (7 marks): The purpose of this experiment is to determine the activation energy (Ea) for the reaction of peroxodisulfate(VI) ions S2O8 2−(aq) with iodide ions I−(aq) using
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