plumiChemical equilibria: reversible reactions, dynamic equilibrium: CAIE A‑Level Chemistry questions
Every CAIE A-Level Chemistry exam question on 7.1 Chemical equilibria: reversible reactions, dynamic equilibrium, June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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Q3(a)
The whole paper ↗![June 2024 Paper 2, question 3(a): Define Le Chatelier’s principle. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970121-jun24-03-a-qp.webp)
Q3(b)
The whole paper ↗
Q3(c)(i)
The whole paper ↗![June 2024 Paper 2, question 3(c)(i): Calculate the initial amount, in mol, of Fe3+(aq) added to SCN–(aq) to produce this mixture. initial amount of Fe3+(aq) = mol [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970121-jun24-03-ci-qp.webp)
Q3(c)(ii)
The whole paper ↗![June 2024 Paper 2, question 3(c)(ii): Calculate Kc for reaction 1 and state its units. Show your working. Kc = units [2] [Total: 9]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970121-jun24-03-cii-qp.webp)
All 8 questions on Chemical equilibria: reversible reactions, dynamic equilibrium, as a list
- June 2024, Paper 1, Q13 (1 mark): An alcohol, ROH, reacts reversibly with ethanoic acid to produce an ester. ROH(l) + CH3COOH(l) CH3COOR(l) + H2O(l) 3.0 mol of ROH, 2.0 mol of ethanoic acid and
- June 2024, Paper 1, Q14 (1 mark): Graphs can be drawn to show the percentage of ammonia at equilibrium when nitrogen and hydrogen are mixed at different temperatures and pressures. Which diagram
- June 2024, Paper 2, Q3(a) (2 marks): Define Le Chatelier’s principle. [2]
- June 2024, Paper 2, Q3(b) (3 marks): Reaction 1 describes the reversible reaction between yellow Fe3+(aq) and colourless SCN–(aq) to produce red FeSCN2+(aq). reaction 1 Fe3+(aq) + SCN–(aq) FeSCN2+(
- June 2024, Paper 2, Q3(c)(i) (2 marks): Calculate the initial amount, in mol, of Fe3+(aq) added to SCN–(aq) to produce this mixture. initial amount of Fe3+(aq) = mol [2]
- June 2024, Paper 2, Q3(c)(ii) (2 marks): Calculate Kc for reaction 1 and state its units. Show your working. Kc = units [2] [Total: 9]
- Specimen, Paper 1, Q12 (1 mark): Methanol can be produced from hydrogen and carbon monoxide. 2H2(g) + CO(g) ⇌ CH3OH(g) What is the expression for Kp for this reaction? 2 p 2 p # H CO A K = 2 p
- Specimen, Paper 1, Q15 (1 mark): A mixture of gases consists of 12.0 g of hydrogen, 42.0 g of nitrogen and 4.0 g of helium. What is the mole fraction of hydrogen in the mixture? A 0.21 B 0.60 C
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