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Kinetics: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on DF Kinetics (specification points DF(h)–(j)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

  1. Q20

    June 2025 · Paper 1

    1 markDF Kinetics
    The whole paper ↗
    June 2025 Paper 1, question 20: The cracking of one molecule of compound H produces but-1-ene, propene and butane in a 2:2:1 mol ratio. What is the Mr of compound H? A 154 B 156 C 250 D 254 Yo

  2. Q31(c)(ii)

    June 2025 · Paper 1

    3 marksDF Kinetics
    The whole paper ↗
    June 2025 Paper 1, question 31(c)(ii): In this hydrogenation reaction, nickel is acting as a heterogeneous catalyst. Explain how a heterogeneous catalyst lowers the activation enthalpy of a reaction.

  3. Q1(a)(i)

    June 2025 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2025 AS Paper 2, question 1(a)(i): Explain the meaning of the term heterogeneous here. [1]

  4. Q1(a)(iv)

    June 2025 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2025 AS Paper 2, question 1(a)(iv): A simple model to explain the function of a heterogeneous catalyst involves four steps. Complete Step 2 and Step 3 in the sequence below. Step 1 Reactants are a

  5. Q33(d)(i)

    June 2024 · Paper 1

    1 markDF Kinetics
    The whole paper ↗
    June 2024 Paper 1, question 33(d)(i): Explain the meaning of the term heterogeneous here. [1]

  6. Q6

    June 2024 · AS Paper 1

    1 markDF Kinetics
    The whole paper ↗
    June 2024 AS Paper 1, question 6: What are possible products from cracking an alkane molecule? A one alkane molecule and two alkene molecules B two alkane molecules C two alkane molecules and on

  7. Q12

    June 2023 · Paper 1

    1 markDF Kinetics
    The whole paper ↗
    June 2023 Paper 1, question 12: Which combination of organic molecules can be formed during the cracking of octane? A propane + pentane B propene + pentane C propene + pent-1-ene D 2 molecules

  8. Q7

    June 2023 · AS Paper 1

    1 markDF Kinetics
    The whole paper ↗
    June 2023 AS Paper 1, question 7: What is correct about a cracking reaction? A An alkane can be broken into an alkane and two alkenes. B An alkane can be converted into two smaller alkanes and a

  9. Q4(e)(i)

    June 2023 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2023 AS Paper 2, question 4(e)(i): What type of catalyst is iron in the Haber process? [1]

  10. Q4(e)(ii)

    June 2023 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2023 AS Paper 2, question 4(e)(ii): Complete the following stages that describe the function of the iron in the Haber process. Stage 1 nitrogen and hydrogen are adsorbed onto the surface of the ir

  11. Q2(h)(i)

    June 2022 · Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2022 Paper 2, question 2(h)(i): Complete the equation for a cracking reaction. 2C4H8 + C4H10 [1]

  12. Q2(h)(ii)

    June 2022 · Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2022 Paper 2, question 2(h)(ii): Cracking is an example of heterogeneous catalysis. Name the first step in the mechanism of heterogeneous catalysis. [1]

  13. Q2(a)(i)

    June 2022 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2022 AS Paper 2, question 2(a)(i): Explain why the catalyst is described as heterogeneous. [1]

  14. Q2(a)(ii)

    June 2022 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2022 AS Paper 2, question 2(a)(ii): The catalyst gets coated with carbon over time and becomes less effective. Give the general name of a substance that reduces the function of a catalyst in this

  15. Q2(a)(iii)

    June 2022 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2022 AS Paper 2, question 2(a)(iii): The compounds below might be found in the apparatus in Fig. 2.1 when it is in use. Match the appropriate formula with the places from Fig. 2.1: C2H4 C6H14 C12H2

  16. Q2(b)(ii)

    June 2022 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    June 2022 AS Paper 2, question 2(b)(ii): Complete the missing stages in the mechanism of heterogeneous catalysis given below. Stage 1 Reactants diffuse to and are adsorbed onto the catalyst surface. St

  17. Q11

    November 2021 · Paper 1

    1 markDF Kinetics
    The whole paper ↗
    November 2021 Paper 1, question 11: What is correct about catalysis? A A catalyst poison slows a reaction without affecting the catalyst. B A catalyst remains unchanged chemically at the end of th

  18. Q35(b)(ii)

    November 2021 · Paper 1

    1 markDF Kinetics
    The whole paper ↗
    November 2021 Paper 1, question 35(b)(ii): Suggest an explanation for the order you have given. [1]

  19. Q1(d)

    November 2021 · Paper 2

    1 markDF Kinetics
    The whole paper ↗
    November 2021 Paper 2, question 1(d): Octane can be cracked. Write an equation for the cracking of octane into but-2-ene, CH3CH=CHCH3, and one other compound. Use molecular formulae. [1]

  20. Q4(d)(ii)

    November 2021 · AS Paper 2

    1 markDF Kinetics
    The whole paper ↗
    November 2021 AS Paper 2, question 4(d)(ii): Name the type of catalysis provided by the mixture of solids. [1]
All 34 questions on Kinetics, as a list
  1. June 2025, Paper 1, Q20 (1 mark): The cracking of one molecule of compound H produces but-1-ene, propene and butane in a 2:2:1 mol ratio. What is the Mr of compound H? A 154 B 156 C 250 D 254 Yo
  2. June 2025, Paper 1, Q31(c)(ii) (3 marks): In this hydrogenation reaction, nickel is acting as a heterogeneous catalyst. Explain how a heterogeneous catalyst lowers the activation enthalpy of a reaction.
  3. June 2025, AS Paper 2, Q1(a)(i) (1 mark): Explain the meaning of the term heterogeneous here. [1]
  4. June 2025, AS Paper 2, Q1(a)(iv) (1 mark): A simple model to explain the function of a heterogeneous catalyst involves four steps. Complete Step 2 and Step 3 in the sequence below. Step 1 Reactants are a
  5. June 2024, Paper 1, Q33(d)(i) (1 mark): Explain the meaning of the term heterogeneous here. [1]
  6. June 2024, AS Paper 1, Q6 (1 mark): What are possible products from cracking an alkane molecule? A one alkane molecule and two alkene molecules B two alkane molecules C two alkane molecules and on
  7. June 2023, Paper 1, Q12 (1 mark): Which combination of organic molecules can be formed during the cracking of octane? A propane + pentane B propene + pentane C propene + pent-1-ene D 2 molecules
  8. June 2023, AS Paper 1, Q7 (1 mark): What is correct about a cracking reaction? A An alkane can be broken into an alkane and two alkenes. B An alkane can be converted into two smaller alkanes and a
  9. June 2023, AS Paper 2, Q4(e)(i) (1 mark): What type of catalyst is iron in the Haber process? [1]
  10. June 2023, AS Paper 2, Q4(e)(ii) (1 mark): Complete the following stages that describe the function of the iron in the Haber process. Stage 1 nitrogen and hydrogen are adsorbed onto the surface of the ir
  11. June 2022, Paper 2, Q2(h)(i) (1 mark): Complete the equation for a cracking reaction. 2C4H8 + C4H10 [1]
  12. June 2022, Paper 2, Q2(h)(ii) (1 mark): Cracking is an example of heterogeneous catalysis. Name the first step in the mechanism of heterogeneous catalysis. [1]
  13. June 2022, AS Paper 2, Q2(a)(i) (1 mark): Explain why the catalyst is described as heterogeneous. [1]
  14. June 2022, AS Paper 2, Q2(a)(ii) (1 mark): The catalyst gets coated with carbon over time and becomes less effective. Give the general name of a substance that reduces the function of a catalyst in this
  15. June 2022, AS Paper 2, Q2(a)(iii) (1 mark): The compounds below might be found in the apparatus in Fig. 2.1 when it is in use. Match the appropriate formula with the places from Fig. 2.1: C2H4 C6H14 C12H2
  16. June 2022, AS Paper 2, Q2(b)(ii) (1 mark): Complete the missing stages in the mechanism of heterogeneous catalysis given below. Stage 1 Reactants diffuse to and are adsorbed onto the catalyst surface. St
  17. November 2021, Paper 1, Q11 (1 mark): What is correct about catalysis? A A catalyst poison slows a reaction without affecting the catalyst. B A catalyst remains unchanged chemically at the end of th
  18. November 2021, Paper 1, Q35(b)(ii) (1 mark): Suggest an explanation for the order you have given. [1]
  19. November 2021, Paper 2, Q1(d) (1 mark): Octane can be cracked. Write an equation for the cracking of octane into but-2-ene, CH3CH=CHCH3, and one other compound. Use molecular formulae. [1]
  20. November 2021, AS Paper 2, Q4(d)(ii) (1 mark): Name the type of catalysis provided by the mixture of solids. [1]
  21. November 2021, AS Paper 2, Q4(d)(iii) (2 marks): Describe the stages that occur between adsorption and desorption to allow the reaction to occur. 1. Adsorption 2. 3. 4. Desorption [2]
  22. November 2020, Paper 1, Q31(b)(i) (2 marks): State the type of catalysis in the catalytic convertor. Explain your answer. Type of catalysis Explanation [2]
  23. November 2020, AS Paper 1, Q8 (1 mark): Which statement about cracking a liquid alkane in the laboratory is correct? A No alkanes remain in the products. B The alkane is mixed with a catalyst and heat
  24. November 2020, AS Paper 1, Q24(d) (1 mark): A nickel catalyst is used with the reaction in equation 24.1. State with a reason whether this is a heterogeneous or a homogeneous catalyst. [1]
  25. June 2019, Paper 3, Q1(c) (2 marks): The industrial manufacture of PLA uses heterogeneous catalysts. A simple model of heterogeneous catalysis has four steps. Describe the four steps involved. 1 2
  26. June 2019, AS Paper 2, Q1(a)(i) (1 mark): Decane, C10H22, can be cracked to give an alkene with four carbon atoms and another alkane. Write a chemical equation for this reaction using molecular formulae
  27. June 2019, AS Paper 2, Q1(b) (4 marks): A student wishes to crack a sample of liquid decane in the laboratory and collect the gaseous products. Fig. 1.1 shows the apparatus that a student drew before
  28. June 2018, Paper 2, Q2(c)(i) (1 mark): Write the equation for the cracking of nonane to give two molecules of propene and one other molecule. [1]
  29. June 2018, AS Paper 1, Q23(a)(i) (3 marks): Draw a labelled diagram of a suitable apparatus that they could use. [3]
  30. June 2018, AS Paper 1, Q23(b)(ii) (1 mark): The students research a simple model of the function of a heterogeneous catalyst. Name the way the hydrocarbon molecules in light naphtha first attach to the ca
  31. June 2017, AS Paper 2, Q1(a) (2 marks): Explain what is meant by the terms heterogeneous and catalyst. [2]
  32. June 2017, AS Paper 2, Q1(d) (2 marks): All three transition metal oxides used in the experiment are heterogeneous catalysts. Heterogeneous catalysts are used in a variety of reactions including crack
  33. June 2017, AS Paper 2, Q1(e)(i) (2 marks): List these four stages in order. Stage 1 Stage 2 Stage 3 Stage 4 [2]
  34. June 2017, AS Paper 2, Q1(e)(ii) (1 mark): Use this model to explain the effect of a catalyst poison on the action of a heterogeneous catalyst. [1]

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