plumiChanging the position of equilibrium: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 9.B.2 Changing the position of equilibrium, 2019–2025, with mark schemes and examiner’s reports where available.
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Q11(b)
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All 31 questions on Changing the position of equilibrium, as a list
- June 2025, AS Unit 2, Q11(b) (1 mark): How does the use of a catalyst affect the equilibrium? (1) A only the rate of the forward reaction increases B the position of equilibrium moves to the right C
- June 2025, AS Unit 2, Q17(c)(ii) (4 marks): Methanol can be produced from the captured carbon dioxide by reaction with hydrogen using a copper catalyst. The equation for the reaction is shown. CO2(g) + 3H
- January 2025, AS Unit 2, Q21(e)(iii) (5 marks): A one‑step process is being developed. This is carried out at 101 kPa and 800 °C. CH4 + ½O2 CH3OH ΔH = –164.3 kJ mol–1 Deduce how the reaction conditions coul
- October 2024, AS Unit 2, Q2(a) (1 mark): What would be the effect of lowering the temperature? (1) A rate increases, yield increases B rate increases, yield decreases C rate decreases, yield increases
- October 2024, AS Unit 2, Q2(b) (1 mark): What would be the effect of increasing the pressure? (1) A rate increases, yield increases B rate increases, yield decreases C rate decreases, yield increases D
- October 2024, AS Unit 2, Q19(b)(ii) (2 marks): State and explain what happens to the position of equilibrium when sodium hydroxide solution, NaOH(aq), is added to this equilibrium mixture. (2)
- June 2024, AS Unit 2, Q19(c)(v) (2 marks): Increasing the amount of water in the reaction mixture, without changing the pressure, might also be suggested. Suggest one advantage and one disadvantage of in
- June 2024, AS Unit 3, Q3(a)(i) (3 marks): Explain the observations you would make as the amount of chlorine gas in the U‑tube increases. (3)
- June 2024, AS Unit 3, Q3(b) (2 marks): Explain what you could do to the U‑tube to result in more brown liquid being observed. (2)
- June 2024 (R), AS Unit 2, Q19(a)(i) (2 marks): Explain what you would see on heating the mixture. (2)
- June 2024 (R), AS Unit 2, Q19(a)(ii) (2 marks): Explain what you would see on increasing the pressure. (2)
- January 2024, AS Unit 2, Q24(b)(i) (1 mark): Give the formula of the chlorine-containing species present at highest concentration in household bleach at pH 12. (1)
- January 2024, AS Unit 2, Q24(b)(ii) (3 marks): Explain why mixing strong acid with bleach is dangerous. Justify your answer using the equilibria shown. (3)
- October 2023, AS Unit 2, Q11(a) (1 mark): What is the effect of a decrease in temperature? (1) A rate increases and yield decreases B rate increases and yield increases C rate decreases and yield decrea
- October 2023, AS Unit 2, Q11(b) (1 mark): What is the effect of an increase in pressure? (1) A rate increases and yield decreases B rate increases and yield increases C rate decreases and yield decrease
- October 2023, AS Unit 2, Q12 (1 mark): A mixture of 1.0 cm3 of 0.20 mol dm–3 potassium chromate(VI) and 5.0 cm3 of 1.0 mol dm–3 sulfuric acid forms the equilibrium shown. 2–(aq) + 2H+(aq) Cr2O7 2–(
- October 2023, AS Unit 2, Q20(c) (3 marks): Between 1960 and 2020 the amount of carbon dioxide in the atmosphere rose from 320 parts per million (ppm) to 420 ppm. The recent rapid increase in the atmosphe
- June 2023, AS Unit 3, Q4(d) (2 marks): Dissolving calcium hydroxide in water is an exothermic process. Describe what you would see if the saturated solution of calcium hydroxide was heated from room
- January 2023, AS Unit 2, Q22(a)(i) (1 mark): Give the reason why excess steam is used in the first reaction. (1)
- January 2023, AS Unit 2, Q22(a)(ii) (1 mark): Predict which of T1 and T2 is the higher temperature. Justify your answer. (1)
- January 2023, AS Unit 2, Q22(f) (2 marks): The NO from the first reaction in Stage 3 is cooled and then converted to nitrogen dioxide, NO2 , by reaction with more O2 . 2NO(g) + O2(g) 2NO2(g) Nitric aci
- October 2022, AS Unit 2, Q21(a)(ii) (4 marks): Step 2 is a reversible reaction. 2SO2(g) + O2(g) 2SO3(g) ∆H = −196 kJ mol−1 State the effect on the position of equilibrium when the temperature and pressure
- June 2022, AS Unit 2, Q11 (1 mark): A mixture of hydrogen and iodine is left in a sealed container at 300 °C until equilibrium is established. H2(g) + I2(g) 2HI(g) The equilibrium mixture is the
- June 2022, AS Unit 2, Q18(d) (2 marks): Ethanol can be manufactured by reacting ethene with steam. C2H4(g) + H2O(g) C2H5OH(g) ΔrH = −45 kJ mol−1 This reaction is usually carried out in industry at 3
- January 2022, AS Unit 2, Q18 (1 mark): Which conditions give the highest yield for the forward reaction? NH4Cl(s) NH3(g) + HCl(g) ΔH = +176 kJ mol−1 A high temperature, high pressure B high tempera
- January 2022, AS Unit 2, Q19 (1 mark): Nitrogen dioxide and dinitrogen tetroxide exist in equilibrium. 2NO2(g) N2O4(g) brown gas colourless gas When an equilibrium is set up in a gas syringe, the m
- June 2021, AS Unit 2, Q22(b)(i) (4 marks): State and explain how the reaction conditions could be changed to maximise the equilibrium yield of phosgene in this reaction. (4)
- January 2021, AS Unit 2, Q19(a) (6 marks): Explain the chemical reasons for the conditions used and why such a low initial yield is acceptable in the industrial process. (6)
- October 2020, AS Unit 2, Q17(a)(i) (2 marks): Explain why high pressure is used. (2)
- January 2020, AS Unit 2, Q18(c)(iii) (2 marks): Explain the effect of increasing the pressure on the equilibrium yield of ammonia. (2)
- June 2019, AS Unit 2, Q4 (1 mark): Which equilibrium shifts to the right-hand side when the pressure in the system decreases at constant temperature? A N2(g) + 3H2(g) U 2NH3(g) B F2(g) + H2(g) U
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