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What factors affect the yield of chemical reactions?: OCR GCSE Combined Science B questions

Every OCR GCSE Combined Science B exam question on C6.3 What factors affect the yield of chemical reactions?, 2018–2025, with its mark scheme and examiner’s report.

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2,688 questions

  1. Q7(a)(i)

    June 2024 · Chemistry Paper 6 Higher

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 7

  2. Q7(a)(ii)

    June 2024 · Chemistry Paper 6 Higher

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 7

  3. Q7(b)(i)

    June 2024 · Chemistry Paper 6 Higher

    4 marksC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 7

  4. Q5(a)(i)

    June 2023 · Chemistry Paper 2 Foundation

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 5

  5. Q5(a)(ii)

    June 2023 · Chemistry Paper 2 Foundation

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 5

  6. Q5(a)(iii)

    June 2023 · Chemistry Paper 2 Foundation

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 5

  7. Q6(a)(i)

    June 2022 · Chemistry Paper 6 Higher

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 6

  8. Q6(a)(ii)

    June 2022 · Chemistry Paper 6 Higher

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 6

  9. Q6(a)(iii)

    June 2022 · Chemistry Paper 6 Higher

    2 marksC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 6

  10. Q6(b)

    June 2022 · Chemistry Paper 6 Higher

    6 marksC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 6

  11. Q5(b)(ii)

    November 2021 · Chemistry Paper 6 Higher

    1 markC1.3 What is the evidence for climate change, why is it occurring?C6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 5

  12. Q8(a)

    June 2018 · Chemistry Paper 6 Higher

    3 marksC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 8

  13. Q8(b)(i)

    June 2018 · Chemistry Paper 6 Higher

    2 marksC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 8

  14. Q8(b)(ii)

    June 2018 · Chemistry Paper 6 Higher

    1 markC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 8

  15. Q8(b)(iii)

    June 2018 · Chemistry Paper 6 Higher

    2 marksC6.3 What factors affect the yield of chemical reactions?
    The whole paper ↗
    The start of question 8
All 15 questions on What factors affect the yield of chemical reactions?, as a list
  1. June 2024, Chemistry Paper 6 Higher, Q7(a)(i) (1 mark): Define this symbol . [1]
  2. June 2024, Chemistry Paper 6 Higher, Q7(a)(ii) (1 mark): Explain why reactions like this never give a 100% yield. [1]
  3. June 2024, Chemistry Paper 6 Higher, Q7(b)(i) (4 marks): Complete the table to show the effect of changing the conditions on yield and rate of reaction. Use words from the list. Increase Decrease No Effect Effect on r
  4. June 2023, Chemistry Paper 2 Foundation, Q5(a)(i) (1 mark): Complete the equation with the symbol to show that it is reversible. N2(g) + 3H2(g) 2NH3(g) [1]
  5. June 2023, Chemistry Paper 2 Foundation, Q5(a)(ii) (1 mark): Why does this reaction not give a 100% yield? [1]
  6. June 2023, Chemistry Paper 2 Foundation, Q5(a)(iii) (1 mark): If the nitrogen and hydrogen are left in a closed container, eventually the reaction will reach a dynamic equilibrium. Complete the sentence to describe when a
  7. June 2022, Chemistry Paper 6 Higher, Q6(a)(i) (1 mark): What is meant by the symbol? [1]
  8. June 2022, Chemistry Paper 6 Higher, Q6(a)(ii) (1 mark): What is happening to the rates of the forward and reverse reactions when it is at dynamic equilibrium? [1]
  9. June 2022, Chemistry Paper 6 Higher, Q6(a)(iii) (2 marks): Why is the yield of the reaction not 100%? [2]
  10. June 2022, Chemistry Paper 6 Higher, Q6(b) (6 marks): Ammonia is manufactured from nitrogen and hydrogen. When nitrogen and hydrogen gases are mixed, they come to a dynamic equilibrium. N2(g) + 3H2(g) 2NH3(g) (b)*
  11. November 2021, Chemistry Paper 6 Higher, Q5(b)(ii) (1 mark): Equation 1 shows an equilibrium reaction. What does the symbol mean? [1]
  12. June 2018, Chemistry Paper 6 Higher, Q8(a) (3 marks): Explain why this reaction cannot produce a yield of 100%. [3]
  13. June 2018, Chemistry Paper 6 Higher, Q8(b)(i) (2 marks): Describe the effect of changing the temperature and the pressure on the percentage yield of ammonia produced. Temperature Pressure [2]
  14. June 2018, Chemistry Paper 6 Higher, Q8(b)(ii) (1 mark): Which temperature and pressure would together give the highest yield? Temperature = °C Pressure = atm [1]
  15. June 2018, Chemistry Paper 6 Higher, Q8(b)(iii) (2 marks): The conditions chosen for the manufacture of ammonia are 400–450 °C and 200 atmospheres pressure. For each condition, give a reason why it is chosen rather than

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