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Formulas: CAIE A‑Level Chemistry questions

Every CAIE A-Level Chemistry exam question on 2.3 Formulas, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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312 questions

  1. Q3(a)

    June 2024 · Paper 4

    1 mark2.3 Formulas
    The whole paper ↗
    June 2024 Paper 4, question 3(a): When a sample of hydrated lithium ethanedioate, Li2C2O4•H2O, is gently heated, two gaseous products are formed and a white solid residue remains. The residue is

  2. Q3(d)

    June 2024 · Paper 4

    1 mark2.3 Formulas
    The whole paper ↗
    June 2024 Paper 4, question 3(d): The anhydrous iron(III) compound K3[Fe(C2O4)3] decomposes on heating to form a mixture of K2[Fe(C2O4)2], K2C2O4 and CO2. Complete the equation for the decomposi

  3. Q2(c)(ii)

    June 2024 · Paper 2

    1 mark2.3 Formulas
    The whole paper ↗
    June 2024 Paper 2, question 2(c)(ii): Magnesium nitride reacts with an excess of water to produce ammonia and magnesium hydroxide only. Construct an equation to describe this reaction. [1]

  4. Q2(d)(i)

    June 2024 · Paper 2

    1 mark2.3 Formulas
    The whole paper ↗
    June 2024 Paper 2, question 2(d)(i): Use Fig. 2.2 to deduce the empirical formula of boron nitride. [1]

  5. Q2(c)(iv)

    Specimen · Paper 2

    2 marks2.3 Formulas
    The whole paper ↗
    Specimen Paper 2, question 2(c)(iv): Use your answers from (c)(ii) and (c)(iii) to deduce the molecular formula of the hydrocarbon, C60H2x. (If you were unable to calculate the amount of hydrogen g

  6. Q2(d)(i)

    Specimen · Paper 2

    2 marks2.3 Formulas
    The whole paper ↗
    Specimen Paper 2, question 2(d)(i): Construct an equation for this reaction. Include state symbols. [2]

  7. Q3(b)(ii)

    Specimen · Paper 2

    1 mark2.3 Formulas
    The whole paper ↗
    Specimen Paper 2, question 3(b)(ii): Deduce the charge on the cation. [1]
All 7 questions on Formulas, as a list
  1. June 2024, Paper 4, Q3(a) (1 mark): When a sample of hydrated lithium ethanedioate, Li2C2O4•H2O, is gently heated, two gaseous products are formed and a white solid residue remains. The residue is
  2. June 2024, Paper 4, Q3(d) (1 mark): The anhydrous iron(III) compound K3[Fe(C2O4)3] decomposes on heating to form a mixture of K2[Fe(C2O4)2], K2C2O4 and CO2. Complete the equation for the decomposi
  3. June 2024, Paper 2, Q2(c)(ii) (1 mark): Magnesium nitride reacts with an excess of water to produce ammonia and magnesium hydroxide only. Construct an equation to describe this reaction. [1]
  4. June 2024, Paper 2, Q2(d)(i) (1 mark): Use Fig. 2.2 to deduce the empirical formula of boron nitride. [1]
  5. Specimen, Paper 2, Q2(c)(iv) (2 marks): Use your answers from (c)(ii) and (c)(iii) to deduce the molecular formula of the hydrocarbon, C60H2x. (If you were unable to calculate the amount of hydrogen g
  6. Specimen, Paper 2, Q2(d)(i) (2 marks): Construct an equation for this reaction. Include state symbols. [2]
  7. Specimen, Paper 2, Q3(b)(ii) (1 mark): Deduce the charge on the cation. [1]

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