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Formulae and equations: Eduqas A‑Level Chemistry questions

Every Eduqas A-Level Chemistry exam question on C1.1 Formulae and equations, 2016–2025, with its mark scheme and examiner’s report.

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1,513 questions

  1. Q10(a)

    June 2025 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2025 AS Component 1, question 10(a): Write an ionic equation for the reaction between hydrochloric acid and magnesium. [1]

  2. Q12(e)(iii)

    June 2025 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2025 AS Component 1, question 12(e)(iii): Sodium amide, NaNH2, is formed from the reaction of sodium and ammonia. Hydrogen is the only other product. Write an equation for this reaction. [1]

  3. Q13(a)(i)

    June 2025 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2025 AS Component 1, question 13(a)(i): Give the oxidation number of chlorine in potassium chlorate. [1]

  4. Q13(a)(ii)

    June 2025 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2025 AS Component 1, question 13(a)(ii): Write an equation for this reaction. [1]

  5. Q10(d)(i)

    June 2024 · Component 2

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2024 Component 2, question 10(d)(i): Balance the equation for this combustion. For simplicity the formula of poly(ethenylnitrate) is given as CH2CH(ONO2). [1] CH2CH(ONO2)(s) + O2(g) CO2(g) + N2(g)

  6. Q11(b)

    June 2024 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2024 AS Component 1, question 11(b): State why this reaction is described as an oxidation reaction. [1]

  7. Q12(a)(i)

    Autumn 2021 · Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    Autumn 2021 Component 1, question 12(a)(i): In step 1 of the process, ammonia is oxidised by oxygen to give nitric oxide, NO, and water. Write an equation for this step. [1]

  8. Q2

    Autumn 2020 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    Autumn 2020 AS Component 1, question 2: What is the oxidation state of sulfur in the SO4 2– ion? [1]

  9. Q6

    Autumn 2020 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    Autumn 2020 AS Component 1, question 6: Balance the following equation. [1] 3 K2CO3 + AlCl3 + H2O KCl + Al(OH)3 + CO2

  10. Q12(a)(i)

    June 2019 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2019 AS Component 1, question 12(a)(i): What is the oxidation state of chlorine in NaClO3? [1]

  11. Q7(a)

    June 2018 · Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2018 Component 1, question 7(a): Balance the equation. [1] … …… Cl2 + … …… NaOH … …… NaCl + … …… NaClO3 + … …… H2O

  12. Q2

    June 2018 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2018 AS Component 1, question 2: Give the oxidation state of chromium in the dichromate ion, Cr2O7 2–. [1]

  13. Q4

    June 2017 · Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2017 Component 1, question 4: When dilute sulfuric acid is added to a solution of barium chloride a white precipitate forms. Write the ionic equation for this reaction. [1]

  14. Q11(a)

    June 2017 · Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2017 Component 1, question 11(a): Phosphorus(V) oxide, P4O10, reacts with water to form phosphoric(V) acid. Balance the equation for this reaction. [1] P4O10 + H2O H3PO4

  15. Q2

    June 2017 · Component 2

    2 marksC1.1 Formulae and equations
    The whole paper ↗
    June 2017 Component 2, question 2: Organic sulfur compounds that are present in petroleum need to be removed before it is refined into fuels. They are removed by passing them, together with hydro

  16. Q8(b)

    June 2017 · Component 2

    2 marksC1.1 Formulae and equations
    The whole paper ↗
    June 2017 Component 2, question 8(b): Another method to produce ethanedioic acid uses propene from the petrochemical industry as the starting material. Propene is reacted with nitric acid to give an

  17. Q6

    June 2017 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2017 AS Component 1, question 6: Give the oxidation state of vanadium in the ion VO3 −. [1]

  18. Q7

    June 2017 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2017 AS Component 1, question 7: Name two substances whose aqueous solutions can be mixed to produce the insoluble compound copper(II) hydroxide. [1] and

  19. Q8

    June 2017 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2017 AS Component 1, question 8: Balance the equation below. [1] 3Cu(s) + HNO3(aq) Cu(NO3)2(aq) + NO(g) + H2O(l)

  20. Q4

    June 2016 · AS Component 1

    1 markC1.1 Formulae and equations
    The whole paper ↗
    June 2016 AS Component 1, question 4: Hydrogen sulfide reacts with sulfur dioxide. 2H2S(g) + SO2(g) 2H2O(l) + 3S(s) Show, using oxidation states, that this is a redox reaction. [1]
All 20 questions on Formulae and equations, as a list
  1. June 2025, AS Component 1, Q10(a) (1 mark): Write an ionic equation for the reaction between hydrochloric acid and magnesium. [1]
  2. June 2025, AS Component 1, Q12(e)(iii) (1 mark): Sodium amide, NaNH2, is formed from the reaction of sodium and ammonia. Hydrogen is the only other product. Write an equation for this reaction. [1]
  3. June 2025, AS Component 1, Q13(a)(i) (1 mark): Give the oxidation number of chlorine in potassium chlorate. [1]
  4. June 2025, AS Component 1, Q13(a)(ii) (1 mark): Write an equation for this reaction. [1]
  5. June 2024, Component 2, Q10(d)(i) (1 mark): Balance the equation for this combustion. For simplicity the formula of poly(ethenylnitrate) is given as CH2CH(ONO2). [1] CH2CH(ONO2)(s) + O2(g) CO2(g) + N2(g)
  6. June 2024, AS Component 1, Q11(b) (1 mark): State why this reaction is described as an oxidation reaction. [1]
  7. Autumn 2021, Component 1, Q12(a)(i) (1 mark): In step 1 of the process, ammonia is oxidised by oxygen to give nitric oxide, NO, and water. Write an equation for this step. [1]
  8. Autumn 2020, AS Component 1, Q2 (1 mark): What is the oxidation state of sulfur in the SO4 2– ion? [1]
  9. Autumn 2020, AS Component 1, Q6 (1 mark): Balance the following equation. [1] 3 K2CO3 + AlCl3 + H2O KCl + Al(OH)3 + CO2
  10. June 2019, AS Component 1, Q12(a)(i) (1 mark): What is the oxidation state of chlorine in NaClO3? [1]
  11. June 2018, Component 1, Q7(a) (1 mark): Balance the equation. [1] … …… Cl2 + … …… NaOH … …… NaCl + … …… NaClO3 + … …… H2O
  12. June 2018, AS Component 1, Q2 (1 mark): Give the oxidation state of chromium in the dichromate ion, Cr2O7 2–. [1]
  13. June 2017, Component 1, Q4 (1 mark): When dilute sulfuric acid is added to a solution of barium chloride a white precipitate forms. Write the ionic equation for this reaction. [1]
  14. June 2017, Component 1, Q11(a) (1 mark): Phosphorus(V) oxide, P4O10, reacts with water to form phosphoric(V) acid. Balance the equation for this reaction. [1] P4O10 + H2O H3PO4
  15. June 2017, Component 2, Q2 (2 marks): Organic sulfur compounds that are present in petroleum need to be removed before it is refined into fuels. They are removed by passing them, together with hydro
  16. June 2017, Component 2, Q8(b) (2 marks): Another method to produce ethanedioic acid uses propene from the petrochemical industry as the starting material. Propene is reacted with nitric acid to give an
  17. June 2017, AS Component 1, Q6 (1 mark): Give the oxidation state of vanadium in the ion VO3 −. [1]
  18. June 2017, AS Component 1, Q7 (1 mark): Name two substances whose aqueous solutions can be mixed to produce the insoluble compound copper(II) hydroxide. [1] and
  19. June 2017, AS Component 1, Q8 (1 mark): Balance the equation below. [1] 3Cu(s) + HNO3(aq) Cu(NO3)2(aq) + NO(g) + H2O(l)
  20. June 2016, AS Component 1, Q4 (1 mark): Hydrogen sulfide reacts with sulfur dioxide. 2H2S(g) + SO2(g) 2H2O(l) + 3S(s) Show, using oxidation states, that this is a redox reaction. [1]

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