plumiEffect of temperature, pressure and catalysts on equilibria and K: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 13.1.2 Effect of temperature, pressure and catalysts on equilibria and K, 2019–2025, with mark schemes and examiner’s reports where available.
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Q13(b)
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Open the full PDFYour answerQ9(b)
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All 26 questions on Effect of temperature, pressure and catalysts on equilibria and K, as a list
- June 2025, Unit 4, Q13(b) (1 mark): Which statement about this equilibrium is correct? (1) A increasing the pressure increases the value of Kp B decreasing the pressure decreases the equilibrium y
- June 2025, Unit 4, Q14(a) (2 marks): A mixture of nitrosyl chloride, chlorine and nitric oxide was placed in a sealed container and allowed to reach equilibrium. Explain what you would expect to se
- June 2025, Unit 4, Q14(b)(iv) (2 marks): When the temperature is reduced, the value of the equilibrium constant, Kc , becomes smaller. Explain what can be deduced about the nature of the reaction. (2)
- June 2025, Unit 6, Q2(c)(iii) (1 mark): The solubility of calcium hydroxide decreases with increasing temperature. Suggest why the mean titre from the experiment in (c)(i) does not agree with the expe
- January 2025, Unit 4, Q10(a) (1 mark): The equation for the reaction between hydrogen and iodine is shown. H2(g) + I2(g) 2HI(g) What is the effect, if any, of an increase in pressure on the appeara
- January 2025, Unit 4, Q10(b) (1 mark): The equation for the manufacture of ammonia by the Haber process is shown. N2(g) + 3H2(g) 2NH3(g) ∆H = –92.2 kJ mol–1 (1) Kp = 6.76 × 105 atm–2 at 298 K Which
- January 2025, Unit 4, Q10(c) (1 mark): The equation for the equilibrium between nitrogen dioxide and dinitrogen tetroxide is shown. N2O4(g) 2NO2(g) A change in conditions results in Kp increasing f
- June 2024, Unit 4, Q4(c) (1 mark): Which change would increase the value of Kp for this reaction? (1) A decreasing the temperature B decreasing the particle size of the catalyst C increasing the
- January 2024, Unit 4, Q3(a) (1 mark): Which of the following statements about the catalyst is not correct? (1) A it lowers the activation energy of the reaction B it has no effect on the equilibrium
- January 2024, Unit 4, Q3(b) (1 mark): Which conditions favour the highest percentage of ammonia in an equilibrium mixture from identical amounts of nitrogen and hydrogen? (1) A a temperature of 400
- June 2023, Unit 4, Q2 (1 mark): The reaction shown occurs at 360 °C and 1 atm. CO + H2O CO2 + H2 ΔH = –41.2 kJ mol–1 What is the type of equilibrium and how is Kc affected by an increase in
- January 2023, Unit 4, Q9(b) (1 mark): What is the effect on the equilibrium constant for this reaction if small pieces of iron are replaced by iron powder and if the temperature is increased? (1) Ir
- October 2022, Unit 4, Q6(a) (1 mark): Which conditions of temperature and pressure would be expected to give the greatest equilibrium yield of NO? (1) A high temperature and high pressure B high tem
- June 2022, Unit 4, Q13 (1 mark): Solid vanadium(V) oxide catalyses the equilibrium shown. 2SO2(g) + O2(g) 2SO3(g) ∆H = −196 kJ mol−1 Which statement is correct? A vanadium(V) oxide is a homog
- June 2022, Unit 4, Q16(a)(iv) (2 marks): When the temperature was reduced to 400 °C at the same pressure, the equilibrium mixture contained 36 % of ammonia. Explain what can be deduced about this react
- January 2022, Unit 4, Q3(a) (1 mark): Which will increase when the temperature is lowered? (1) A the mole fraction of carbon dioxide B the partial pressure of carbon monoxide C the rate of the backw
- January 2022, Unit 4, Q22(d)(iv) (1 mark): State how the Haber Process is made economically feasible at 750 K even though the total entropy change is negative. (1)
- October 2021, Unit 4, Q6(b) (1 mark): What happens to the equilibrium constants of the forward and reverse reactions when the temperature is increased? (1) Kc of forward reaction Kc of reverse react
- October 2021, Unit 4, Q19(b) (3 marks): The manufacture of ethanol is carried out at 230 °C and 70 atm; the overall conversion into ethanol is 95 % . Comment on these conditions in relation to their e
- June 2021, Unit 4, Q20(a)(i) (3 marks): An increase in the total pressure (3)
- June 2021, Unit 4, Q20(a)(ii) (2 marks): An increase in the temperature (2)
- June 2021, Unit 4, Q20(a)(iii) (2 marks): The use of a catalyst (2)
- January 2021, Unit 4, Q18(a)(i) (1 mark): A catalyst of vanadium(V) oxide is used in this reaction. State the effect, if any, of the catalyst on the value of the equilibrium constant, Kp . (1)
- January 2021, Unit 4, Q18(a)(ii) (2 marks): The temperature used for this reaction in industry is 700 K. Explain, in terms of the equilibrium constant and the equilibrium position, the effect of an increa
- October 2020, Unit 4, Q19(a)(v) (6 marks): Explain one advantage and one disadvantage of using a temperature higher than 700 K in the Haber process. Consider the effect of an increase in temperature on t
- October 2020, Unit 4, Q19(b)(iii) (3 marks): The pressure of the system is doubled at constant temperature. Explain the effect of this on the yield of ammonia by considering the change in the Kp expression
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