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Kinetics: OCR A‑Level Chemistry B questions

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

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2,049 questions

  1. Q4(d)

    June 2025 · Paper 2

    1 markPL Kinetics
    The whole paper ↗
    June 2025 Paper 2, question 4(d): Enzymes have a three-dimensional region that bonds with the substrate. Name this region. [1]

  2. Q29

    June 2024 · Paper 1

    1 markPL Kinetics
    The whole paper ↗
    June 2024 Paper 1, question 29: The graph shows how the rate of an enzyme catalysed reaction varies with substrate concentration. reaction rate substrate concentration At low substrate concent

  3. Q3(e)(i)

    June 2024 · Paper 2

    2 marksPL Kinetics
    The whole paper ↗
    June 2024 Paper 2, question 3(e)(i): Explain this specificity in terms of the enzyme active site. [2]

  4. Q35(f)

    June 2023 · Paper 1

    6 marksPL Kinetics
    The whole paper ↗
    June 2023 Paper 1, question 35(f): When developing vaccines against viruses, scientists need to understand the chemistry of the virus spike protein. One type of vaccine contains the messenger RNA

  5. Q4(e)(i)

    June 2022 · Paper 2

    2 marksPL Kinetics
    The whole paper ↗
    June 2022 Paper 2, question 4(e)(i): Explain why warming a solution of chymotrypsin will destroy its activity as an enzyme. [2]

  6. Q4(e)(ii)

    June 2022 · Paper 2

    3 marksPL Kinetics
    The whole paper ↗
    June 2022 Paper 2, question 4(e)(ii): Chymotrypsin has an optimum pH = 8. Draw a sketch to suggest the shape of the graph of chymotrypsin activity against pH. Explain the shape of your graph. [3]

  7. Q4(e)(iii)

    June 2022 · Paper 2

    2 marksPL Kinetics
    The whole paper ↗
    June 2022 Paper 2, question 4(e)(iii): A student says that the rate of an enzyme reaction is proportional to the substrate concentration. Comment on the student’s statement, correcting any errors. [2

  8. Q2(d)

    November 2021 · Paper 3

    3 marksPL Kinetics
    The whole paper ↗
    November 2021 Paper 3, question 2(d): An investigation into the effect of changing substrate concentration on the rate of an enzyme catalysed reaction gave the following graphical results. rate of r

  9. Q15

    November 2020 · Paper 1

    1 markPL Kinetics
    The whole paper ↗
    November 2020 Paper 1, question 15: Which statement about an enzyme reaction is correct? A Enzymes only work over a narrow range of pH values. B Enzymes only work over a 10 °C range of temperature

  10. Q1(e)(ii)

    November 2020 · Paper 2

    1 markPL Kinetics
    The whole paper ↗
    November 2020 Paper 2, question 1(e)(ii): Other students boil the mixture of aspartame and pepsin to attempt to speed up the hydrolysis reaction. State and explain whether or not this would work. [1]

  11. Q1(e)(iii)

    November 2020 · Paper 2

    2 marksPL Kinetics
    The whole paper ↗
    November 2020 Paper 2, question 1(e)(iii): Another student says that using a higher concentration of aspartame at room temperature will speed up the hydrolysis reaction. Comment on this statement. [2]

  12. Q15

    June 2019 · Paper 1

    1 markPL Kinetics
    The whole paper ↗
    June 2019 Paper 1, question 15: Which statement about enzyme catalysed reactions is correct? A The rate determining step is always the formation of an enzyme substrate complex. B They always s

  13. Q29

    June 2019 · Paper 1

    1 markPL Kinetics
    The whole paper ↗
    June 2019 Paper 1, question 29: Which statement(s) is/are correct about the active site of an enzyme? 1 It is formed by the tertiary structure of a protein. 2 It changes shape at high temperat

  14. Q32(d)

    June 2019 · Paper 1

    6 marksPL Kinetics
    The whole paper ↗
    June 2019 Paper 1, question 32(d): DNA carries the instructions for synthesising the primary structures of protein molecules. Its backbone consists of alternating phosphate and deoxyribose sugar

  15. Q32(b)

    June 2018 · Paper 1

    1 markPL Kinetics
    The whole paper ↗
    June 2018 Paper 1, question 32(b): Give two ways a substrate can bind to an enzyme. 1 2 [1]

  16. Q3(a)

    June 2018 · Paper 2

    3 marksPL Kinetics
    The whole paper ↗
    June 2018 Paper 2, question 3(a): Catalase has an active site. Explain how this results in faster decomposition of hydrogen peroxide. [3]

  17. Q3(c)

    June 2018 · Paper 2

    6 marksPL Kinetics
    The whole paper ↗
    June 2018 Paper 2, question 3(c): Why does human hair turn grey? Studies have shown that this is caused by lower levels of the enzyme catalase in hair follicles. Catalase catalyses the breakdown

  18. Q3(d)(i)

    June 2018 · Paper 2

    2 marksPL Kinetics
    The whole paper ↗
    June 2018 Paper 2, question 3(d)(i): Arrange the results in a more appropriate format. [2]

  19. Q3(d)(ii)

    June 2018 · Paper 2

    4 marksPL Kinetics
    The whole paper ↗
    June 2018 Paper 2, question 3(d)(ii): Use the grid below to plot a graph of the results and draw a line of best fit. [4]

  20. Q3(e)(ii)

    June 2018 · Paper 2

    3 marksPL Kinetics
    The whole paper ↗
    June 2018 Paper 2, question 3(e)(ii): Explain why the student is incorrect and give the correct information. [3]
All 22 questions on Kinetics, as a list
  1. June 2025, Paper 2, Q4(d) (1 mark): Enzymes have a three-dimensional region that bonds with the substrate. Name this region. [1]
  2. June 2024, Paper 1, Q29 (1 mark): The graph shows how the rate of an enzyme catalysed reaction varies with substrate concentration. reaction rate substrate concentration At low substrate concent
  3. June 2024, Paper 2, Q3(e)(i) (2 marks): Explain this specificity in terms of the enzyme active site. [2]
  4. June 2023, Paper 1, Q35(f) (6 marks): When developing vaccines against viruses, scientists need to understand the chemistry of the virus spike protein. One type of vaccine contains the messenger RNA
  5. June 2022, Paper 2, Q4(e)(i) (2 marks): Explain why warming a solution of chymotrypsin will destroy its activity as an enzyme. [2]
  6. June 2022, Paper 2, Q4(e)(ii) (3 marks): Chymotrypsin has an optimum pH = 8. Draw a sketch to suggest the shape of the graph of chymotrypsin activity against pH. Explain the shape of your graph. [3]
  7. June 2022, Paper 2, Q4(e)(iii) (2 marks): A student says that the rate of an enzyme reaction is proportional to the substrate concentration. Comment on the student’s statement, correcting any errors. [2
  8. November 2021, Paper 3, Q2(d) (3 marks): An investigation into the effect of changing substrate concentration on the rate of an enzyme catalysed reaction gave the following graphical results. rate of r
  9. November 2020, Paper 1, Q15 (1 mark): Which statement about an enzyme reaction is correct? A Enzymes only work over a narrow range of pH values. B Enzymes only work over a 10 °C range of temperature
  10. November 2020, Paper 2, Q1(e)(ii) (1 mark): Other students boil the mixture of aspartame and pepsin to attempt to speed up the hydrolysis reaction. State and explain whether or not this would work. [1]
  11. November 2020, Paper 2, Q1(e)(iii) (2 marks): Another student says that using a higher concentration of aspartame at room temperature will speed up the hydrolysis reaction. Comment on this statement. [2]
  12. June 2019, Paper 1, Q15 (1 mark): Which statement about enzyme catalysed reactions is correct? A The rate determining step is always the formation of an enzyme substrate complex. B They always s
  13. June 2019, Paper 1, Q29 (1 mark): Which statement(s) is/are correct about the active site of an enzyme? 1 It is formed by the tertiary structure of a protein. 2 It changes shape at high temperat
  14. June 2019, Paper 1, Q32(d) (6 marks): DNA carries the instructions for synthesising the primary structures of protein molecules. Its backbone consists of alternating phosphate and deoxyribose sugar
  15. June 2018, Paper 1, Q32(b) (1 mark): Give two ways a substrate can bind to an enzyme. 1 2 [1]
  16. June 2018, Paper 2, Q3(a) (3 marks): Catalase has an active site. Explain how this results in faster decomposition of hydrogen peroxide. [3]
  17. June 2018, Paper 2, Q3(c) (6 marks): Why does human hair turn grey? Studies have shown that this is caused by lower levels of the enzyme catalase in hair follicles. Catalase catalyses the breakdown
  18. June 2018, Paper 2, Q3(d)(i) (2 marks): Arrange the results in a more appropriate format. [2]
  19. June 2018, Paper 2, Q3(d)(ii) (4 marks): Use the grid below to plot a graph of the results and draw a line of best fit. [4]
  20. June 2018, Paper 2, Q3(e)(ii) (3 marks): Explain why the student is incorrect and give the correct information. [3]
  21. June 2017, Paper 1, Q20 (1 mark): What is correct for reactions involving enzymes? A The enzyme works best at high temperature. B The rate is zero order with respect to substrate at low substrat
  22. June 2017, Paper 2, Q2(c)(i) (3 marks): Suggest how AM404 inhibits the breakdown of anandamide. [3]

Questions, mark schemes and examiner’s reports are © OCR, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Every OCR A-Level Chemistry B paper.

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