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How are equations used to represent chemical reactions?: OCR GCSE Combined Science B questions

Every OCR GCSE Combined Science B exam question on C2.4 How are equations used to represent chemical reactions?, 2018–2025, with its mark scheme and examiner’s report.

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2,688 questions

  1. Q3(c)(i)

    June 2025 · Chemistry Paper 2 Foundation

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 3

  2. Q4(a)

    June 2025 · Chemistry Paper 6 Higher

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4

  3. Q3(a)(i)

    June 2024 · Chemistry Paper 2 Foundation

    4 marksC6.1 What useful products can be made from acids?C2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 3

  4. Q1(d)(i)

    June 2023 · Chemistry Paper 2 Foundation

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 1

  5. Q1(a)(i)

    June 2022 · Chemistry Paper 2 Foundation

    3 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 1

  6. Q1(a)(ii)

    June 2022 · Chemistry Paper 2 Foundation

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 1

  7. Q8(c)

    June 2022 · Combined Science Paper 4 Foundation

    3 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 8

  8. Q4(a)(i)

    June 2022 · Chemistry Paper 6 Higher

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4

  9. Q4(a)(ii)

    June 2022 · Chemistry Paper 6 Higher

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4

  10. Q1(c)

    June 2022 · Combined Science Paper 8 Higher

    3 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 1

  11. Q6(a)

    November 2020 · Chemistry Paper 2 Foundation

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 6

  12. Q8(a)(iii)

    November 2020 · Chemistry Paper 6 Higher

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 8

  13. Q4(a)

    November 2020 · Combined Science Paper 8 Higher

    3 marksC2.3 How do metals and non-metals combine to form compounds?C2.4 How are equations used to represent chemical reactions?
    The whole paper ↗

  14. Q4(a)

    June 2019 · Chemistry Paper 2 Foundation

    3 marksC6.1 What useful products can be made from acids?C2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4

  15. Q7(a)

    June 2019 · Chemistry Paper 6 Higher

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 7

  16. Q9(c)(i)

    June 2018 · Chemistry Paper 2 Foundation

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 9

  17. Q1(c)(i)

    June 2018 · Chemistry Paper 6 Higher

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 1

  18. Q4(a)

    June 2018 · Chemistry Paper 6 Higher

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4

  19. Q4(b)

    June 2018 · Chemistry Paper 6 Higher

    4 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4

  20. Q4(c)(i)

    June 2018 · Chemistry Paper 6 Higher

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4
All 21 questions on How are equations used to represent chemical reactions?, as a list
  1. June 2025, Chemistry Paper 2 Foundation, Q3(c)(i) (1 mark): Complete the balanced symbol equation for the reaction between sodium and bromine to form sodium bromide. 2Na + Br2 NaBr [1]
  2. June 2025, Chemistry Paper 6 Higher, Q4(a) (2 marks): Complete the balanced symbol equation when hexane burns in air. C6H14 + O2 CO2 + H2O [2]
  3. June 2024, Chemistry Paper 2 Foundation, Q3(a)(i) (4 marks): Complete the balanced symbol equation for the reaction between solid zinc carbonate and dilute acid. Include state symbols. [4] ZnCO3(s) + HCl ( ) ZnCl 2( ) + C
  4. June 2023, Chemistry Paper 2 Foundation, Q1(d)(i) (2 marks): Complete the equation by adding the state symbols. 2Li ( ) + 2H2O ( ) 2 LiOH ( ) + H2 ( ) [2]
  5. June 2022, Chemistry Paper 2 Foundation, Q1(a)(i) (3 marks): Name the three elements present in ammonium nitrate. 1 2 3 [3]
  6. June 2022, Chemistry Paper 2 Foundation, Q1(a)(ii) (1 mark): What is the total number of atoms shown in the formula? [1]
  7. June 2022, Combined Science Paper 4 Foundation, Q8(c) (3 marks): Sodium (Na) is a metal that reacts vigorously with hydrochloric acid (HCl) to give off hydrogen (H2). Complete the balanced symbol equation for the reaction of
  8. June 2022, Chemistry Paper 6 Higher, Q4(a)(i) (1 mark): Complete the balanced symbol equation for the reaction of aluminium with sodium hydroxide. Al + 2NaOH + H2O NaAl O2 + H2 [1]
  9. June 2022, Chemistry Paper 6 Higher, Q4(a)(ii) (2 marks): How does the equation show that contact with aluminium surfaces is a hazard? [2]
  10. June 2022, Combined Science Paper 8 Higher, Q1(c) (3 marks): Sodium (Na) is a metal that reacts vigorously with hydrochloric acid (HCl ) to give off hydrogen (H2). Complete the balanced symbol equation for the reaction of
  11. November 2020, Chemistry Paper 2 Foundation, Q6(a) (2 marks): Complete the balanced symbol equation for the combustion of ethanol in air. C2H5OH + O2 CO2 + H2O [2]
  12. November 2020, Chemistry Paper 6 Higher, Q8(a)(iii) (2 marks): Counting atoms and molecules is important when balancing symbol equations. This is the balanced symbol equation for the reaction between hydrogen and oxygen. 2H
  13. November 2020, Combined Science Paper 8 Higher, Q4(a) (3 marks): Sodium is an element in Group 1 of the Periodic Table. Write the balanced symbol equation for the reaction of sodium with chlorine. Include state symbols. [3]
  14. June 2019, Chemistry Paper 2 Foundation, Q4(a) (3 marks): Complete the word and balanced symbol equations for the reaction between magnesium and hydrochloric acid. hydrochloric magnesium + + hydrogen acid + HCl MgCl2 +
  15. June 2019, Chemistry Paper 6 Higher, Q7(a) (2 marks): Write a balanced symbol equation for the breakdown of hydrogen peroxide into water and oxygen. [2]
  16. June 2018, Chemistry Paper 2 Foundation, Q9(c)(i) (1 mark): Potassium reacts with bromine to form potassium bromide. Balance the symbol equation for this reaction. K + Br2 → KBr [1]
  17. June 2018, Chemistry Paper 6 Higher, Q1(c)(i) (1 mark): Potassium reacts with bromine to form potassium bromide. Balance the symbol equation for this reaction. K + Br2 → KBr [1]
  18. June 2018, Chemistry Paper 6 Higher, Q4(a) (2 marks): Kai and Jane react solid calcium carbonate with dilute hydrochloric acid. The products of the reaction are calcium chloride, carbon dioxide and water. This is t
  19. June 2018, Chemistry Paper 6 Higher, Q4(b) (4 marks): Jane does an experiment to find out the total mass of carbon dioxide made when one indigestion tablet reacts with dilute hydrochloric acid. Describe how Jane co
  20. June 2018, Chemistry Paper 6 Higher, Q4(c)(i) (1 mark): What is the range of Jane’s results? Range = [1]
  21. June 2018, Chemistry Paper 6 Higher, Q4(c)(ii) (3 marks): Calculate the mean value for the mass of carbon dioxide made. Give your answer to 2 decimal places. Mean value = g [3]

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