plumiThe Boltzmann distribution: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 3.2.2.4 The Boltzmann distribution, 2016–2025, with mark schemes and examiner’s reports where available.
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Q18(a)(ii)
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All 16 questions on The Boltzmann distribution, as a list
- June 2025, Paper 1, Q18(a)(ii) (2 marks): Explain how the platinum catalyst increases the rate of reaction. Include a labelled sketch of the Boltzmann distribution on the grid. Number of molecules 0 0 E
- June 2024, Paper 1, Q8 (1 mark): Which row in the table explains how a catalyst affects the activation energy (Ea) and the proportion of molecules with energy > Ea? How the activation Proportio
- June 2024, AS Paper 1, Q12 (1 mark): A mixture of gases is heated in a closed container. The reaction rate increases. Which statement explains why the rate increases? A More molecules have an energ
- June 2024, AS Paper 2, Q4(a) (4 marks): Explain, using a Boltzmann distribution model, why the rate of a reaction increases in the presence of a catalyst. You are provided with the axes below, which y
- June 2023, AS Paper 1, Q13 (1 mark): The Boltzmann distribution showing the activation energy, Ea, for an uncatalysed reaction is shown below. number of molecules Ea energy What is the difference f
- June 2022, Paper 1, Q16(a)(i) (3 marks): Explain how increasing the temperature increases the rate of Reaction 16.1. Include a labelled sketch, using Boltzmann distributions, on the grid below. Label t
- June 2022, Paper 3, Q4(a) (4 marks): The students are supplied with the equilibrium mixture in Equilibrium 4.1 at room temperature. One student heats 20 cm3 of the mixture to 50 °C. • The other stu
- June 2022, AS Paper 1, Q25(b) (3 marks): The Boltzmann distribution model can be used by chemists to explain how the rate of a reaction is affected by temperature. Fig. 25.1 shows the Boltzmann distrib
- November 2021, AS Paper 1, Q11 (1 mark): The Boltzmann distributions below show a gas at two different temperatures. Which Boltzmann distribution shows the dotted curve at a higher temperature? number
- November 2020, Paper 1, Q7 (1 mark): The diagram represents a Boltzmann distribution curve of molecules at a given temperature. number of molecules energy Which statement for this Boltzmann distrib
- November 2020, AS Paper 1, Q24(b) (5 marks): The industrial manufacture of NH3 from N2 and H2 is carried out at an increased temperature and in the presence of a catalyst. Explain, using Boltzmann distribu
- June 2019, Paper 1, Q19(c)(i) (4 marks): Explain how the presence of V2O5(s) increases the rate of reaction. Include a labelled sketch of the Boltzmann distribution, on the grid below. Label the axes.
- June 2019, AS Paper 1, Q12 (1 mark): What is the main reason for the increase in reaction rate with increasing temperature? A The activation energy decreases. B The activation energy increases. C M
- June 2018, Paper 1, Q14 (1 mark): Which statement(s) explain(s) why reaction rates increase as temperature increases? 1 The activation energy is less. 2 Collisions between molecules are more fre
- June 2018, AS Paper 1, Q23(b) (4 marks): Using the Boltzmann distribution model, explain how the rate of a reaction is affected by temperature. You are provided with the axes below, which should be lab
- June 2017, AS Paper 1, Q23(a) (4 marks): Using the Boltzmann distribution model, explain why the rate of a reaction increases in the presence of a catalyst. You are provided with the axes below, which
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