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

Every OCR GCSE Chemistry 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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1,562 questions

  1. Q6(a)(i)

    June 2025 · Paper 1 Foundation

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

  2. Q3(a)(i)

    June 2025 · Paper 3 Higher

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

  3. Q2(b)

    June 2024 · Paper 1 Foundation

    4 marksC2.2 What does the Periodic Table tell us about the elements?C2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 2

  4. Q8(a)(i)

    June 2024 · Paper 1 Foundation

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

  5. Q7(d)

    June 2023 · Paper 1 Foundation

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 7

  6. Q10(c)(ii)

    June 2023 · Paper 1 Foundation

    1 markC6.1 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 10

  7. Q7(a)

    June 2022 · Paper 4 Higher

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

  8. Q4(a)(i)

    November 2021 · Paper 3 Higher

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

  9. Q7(b)

    November 2020 · Paper 1 Foundation

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 7

  10. Q7(c)(ii)

    November 2020 · Paper 1 Foundation

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 7

  11. Q8(f)(ii)

    November 2020 · Paper 1 Foundation

    1 markC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 8

  12. Q6(a)

    November 2020 · Paper 2 Foundation

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

  13. Q5(b)

    November 2020 · Paper 3 Higher

    3 marksC5.2 How do chemists find the composition of unknown samples?C2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 5

  14. Q10(b)

    November 2020 · Paper 3 Higher

    2 marksC2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 10

  15. Q4(a)

    June 2019 · Paper 2 Foundation

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

  16. Q4(b)

    June 2019 · Paper 2 Foundation

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

  17. Q3(a)(i)

    June 2018 · Paper 1 Foundation

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

  18. Q4(b)(i)

    June 2018 · Paper 1 Foundation

    2 marksC2.2 What does the Periodic Table tell us about the elements?C2.4 How are equations used to represent chemical reactions?
    The whole paper ↗
    The start of question 4
All 18 questions on How are equations used to represent chemical reactions?, as a list
  1. June 2025, Paper 1 Foundation, Q6(a)(i) (2 marks): Complete the balanced symbol equation for the reaction. CuCl2(aq) + NaOH(aq) Cu(OH)2(s) + 2 (aq) [2]
  2. June 2025, Paper 3 Higher, Q3(a)(i) (2 marks): Complete the balanced symbol equation for the reaction. 4Fe(s) + 3 (g) Fe2O3(s) [2]
  3. June 2024, Paper 1 Foundation, Q2(b) (4 marks): Lithium reacts with water to form an alkaline solution and hydrogen gas. Complete the word equation and balanced symbol equation for the reaction. Include state
  4. June 2024, Paper 1 Foundation, Q8(a)(i) (2 marks): Complete the balanced symbol equation for the formation of Fe2O3. Fe + O2 2Fe2O3 [2]
  5. June 2023, Paper 1 Foundation, Q7(d) (1 mark): Molecules of another oxide of nitrogen contain two nitrogen atoms and one oxygen atom. Write the formula of this oxide of nitrogen. [1]
  6. June 2023, Paper 1 Foundation, Q10(c)(ii) (1 mark): A salt called calcium formate is also formed when formic acid reacts with calcium carbonate. The formula of the calcium ion is Ca2+. The formula of the formate
  7. June 2022, Paper 4 Higher, Q7(a) (3 marks): Complete the word and symbol equations for the reaction in the boiling tube by filling in the name of the missing product and the state symbols for each substan
  8. November 2021, Paper 3 Higher, Q4(a)(i) (1 mark): Balance the symbol equation for the reaction of lithium with water. Li + H2O LiOH + H2 [1]
  9. November 2020, Paper 1 Foundation, Q7(b) (1 mark): Amir thinks Salt A is potassium sulfate. Potassium sulfate contains K+ ions and SO4 2– ions. What is the chemical formula of potassium sulfate? [1]
  10. November 2020, Paper 1 Foundation, Q7(c)(ii) (1 mark): Complete the word equation for the reaction. potassium sulfate + barium chloride barium sulfate + [1]
  11. November 2020, Paper 1 Foundation, Q8(f)(ii) (1 mark): Magnesium oxide can be formed by burning magnesium in oxygen. Complete the balanced symbol equation for this reaction. ……… Mg + O2 ……… MgO [1]
  12. November 2020, Paper 2 Foundation, Q6(a) (2 marks): Complete the word equation and balance the symbol equation for the reaction that happens in the crucible. magnesium + magnesium oxide Mg + O2 MgO [2]
  13. November 2020, Paper 3 Higher, Q5(b) (3 marks): Write a balanced symbol equation for the reaction of potassium sulfate (K2SO4) solution with barium chloride (BaCl2) solution. Show state symbols. [3]
  14. November 2020, Paper 3 Higher, Q10(b) (2 marks): Lithium reacts with water to form lithium hydroxide (LiOH) and a gas. Write a balanced symbol equation for this reaction. [2]
  15. June 2019, Paper 2 Foundation, Q4(a) (1 mark): Add the missing state symbols to the equation. [1]
  16. June 2019, Paper 2 Foundation, Q4(b) (1 mark): Write a word equation for this reaction. [1]
  17. June 2018, Paper 1 Foundation, Q3(a)(i) (1 mark): The formula of ammonium sulfate is (NH4)2SO4. Which elements does ammonium sulfate contain? Tick (3) four boxes. Ammonia Hydrogen Nitrogen Oxygen Sodium Sulfur
  18. June 2018, Paper 1 Foundation, Q4(b)(i) (2 marks): Complete word and chemical equations for the reaction that happens. chlorine + potassium bromide + bromine Cl2 + 2 2KCl + Br2 [2]

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