plumiCatalysts: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 9.A.4 Catalysts, 2019–2025, with mark schemes and examiner’s reports where available.
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Q11(b)
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All 26 questions on Catalysts, as a list
- June 2025, AS Unit 2, Q11(b) (1 mark): How does the use of a catalyst affect the equilibrium? (1) A only the rate of the forward reaction increases B the position of equilibrium moves to the right C
- June 2025, AS Unit 2, Q14(a) (3 marks): Ammonia is produced in the Haber process. Nitrogen and hydrogen react at a pressure of 200 atmospheres and a temperature of 725 K, using an iron catalyst. Expla
- January 2025, AS Unit 2, Q21(e)(ii) (2 marks): Many different catalysts have been used, including MoO3 , WO3 and Re. State two characteristics that all these catalysts have in common. (2)
- October 2024, AS Unit 2, Q1(b) (1 mark): How does the diagram change if a catalyst is added? (1) A the activation energy moves to the right and the peak stays the same B the activation energy moves to
- October 2024, AS Unit 3, Q4(b)(i) (1 mark): State how PbO2 can be identified as the best catalyst under these conditions. (1)
- June 2024, AS Unit 2, Q15(c) (1 mark): For Container 4, at the same temperature and pressure as Container 1, the walls of the container act as a catalyst for the reaction of the gas. For which values
- January 2024, AS Unit 2, Q24(d) (4 marks): The industrial manufacture of ethanoic acid first used an iodine-based catalyst. Explain, with the aid of a labelled Maxwell–Boltzmann distribution, how a catal
- October 2023, AS Unit 2, Q21(b)(i) (3 marks): Explain how a catalyst increases the rate of this reaction. Use the Maxwell–Boltzmann distribution shown and refer to the collision theory. (3) Number of partic
- June 2023, AS Unit 2, Q14 (1 mark): In a series of experiments, the time taken to complete the reaction between iron(III) sulfate and sodium thiosulfate in aqueous solution is measured. One drop o
- June 2023, AS Unit 2, Q21(a)(ii) (2 marks): Using the Maxwell–Boltzmann distributions, explain why increasing the temperature and adding a catalyst both increase the rate of reaction. (2)
- January 2023, AS Unit 2, Q22(d)(i) (3 marks): Complete the profile for the catalysed and uncatalysed reactions. Label the activation energies and the enthalpy change of reaction, ΔH. Your diagram must match
- January 2023, AS Unit 2, Q22(d)(ii) (1 mark): Suggest why the use of the catalyst makes Stage 2 more sustainable. (1)
- October 2022, AS Unit 2, Q21(a)(iii) (4 marks): Vanadium(V) oxide, V2O5 , is used to catalyse the reaction in Step 2. Complete the reaction profile to show both the catalysed and uncatalysed reactions. Label
- October 2022, AS Unit 2, Q21(a)(iv) (2 marks): Explain how the use of a catalyst makes this reaction more sustainable. (2)
- June 2022, AS Unit 2, Q10(a) (1 mark): A catalyst increases the rate of decomposition by (1) A increasing the average kinetic energy of the H2O2 molecules B decreasing the average kinetic energy of t
- January 2022, AS Unit 2, Q24(f)(i) (1 mark): Explain why it is not correct to state that urea is acting as a catalyst in the reaction. (1)
- January 2022, AS Unit 2, Q24(f)(ii) (3 marks): Explain how a catalyst increases the rate of a chemical reaction. Use the Maxwell‑Boltzmann distribution shown and refer to the collision theory. (3) Number of
- January 2022, AS Unit 2, Q24(g)(i) (1 mark): Suggest how the catalytic converter reaches this temperature. (1)
- October 2021, AS Unit 2, Q22(e)(ii) (4 marks): The rate of this reaction is increased by using a catalyst of phosphoric acid. Label the axes on the Maxwell–Boltzmann distribution curve and use it to explain
- October 2021, AS Unit 2, Q22(f)(i) (1 mark): Suggest the advantage of using support materials containing lots of pores. (1)
- June 2021, AS Unit 2, Q4 (1 mark): The solid line on the graph below shows the Maxwell–Boltzmann distribution for an uncatalysed reaction. Ea is the activation energy of this reaction. X Number o
- January 2021, AS Unit 2, Q22(d)(ii) (4 marks): A student investigated the role of the catalyst in this reaction. Procedure Step 1 Heat a sample of KClO3 , in a test tube, with a known mass of insoluble cata
- January 2021, AS Unit 2, Q22(e) (2 marks): Explain, using the diagram, how a catalyst speeds up a chemical reaction. (2) Number of particles with energy, E Energy, E
- October 2020, AS Unit 2, Q17(a)(iii) (1 mark): Give a reason why using a catalyst to increase the rate makes the process more sustainable. (1)
- January 2020, AS Unit 2, Q18(c)(i) (3 marks): Draw on the axes the Maxwell−Boltzmann distribution of molecular energies of the reactant gases, showing on your diagram the activation energies for the catalys
- January 2020, AS Unit 2, Q18(c)(ii) (2 marks): Explain, using your diagram, why the addition of a catalyst changes the rate of the reaction. (2)
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