plumiInvestigating reaction rates in practice: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 3.2.2.3 Investigating reaction rates in practice, 2016–2025, with mark schemes and examiner’s reports where available.
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Q4(b)(i)
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All 13 questions on Investigating reaction rates in practice, as a list
- June 2024, AS Paper 2, Q4(b)(i) (2 marks): On graph 4.1, draw a best-fit smooth curve of the results and circle the anomalous result. [2]
- June 2024, AS Paper 2, Q4(c) (2 marks): A student plans to compare the rate of decomposition of H2O2 using different metal oxides as the catalyst. Suggest two variables which should be kept constant.
- November 2021, AS Paper 2, Q6(b) (2 marks): A second student suggests that the experiment could be improved by measuring the loss in mass in the conical flask over time. The student places a conical flask
- June 2019, AS Paper 2, Q4(b)(i) (1 mark): On the graph paper in Fig. 4.1, label the x axis and plot the results in Table 4.1. [1]
- June 2019, AS Paper 2, Q4(b)(ii) (1 mark): Circle any anomalous results present in the graph you have drawn in Fig. 4.1. [1]
- June 2019, AS Paper 2, Q4(b)(iii) (1 mark): Draw a best-fit smooth curve on the graph you have drawn in Fig. 4.1. [1] 11 80 70 60 50 volume 40 / cm3 30 20 10 0 Fig. 4.1
- June 2019, AS Paper 2, Q4(c) (2 marks): The student repeats the experiment using: • zinc with the same mass (0.200 g) and same surface area • the same temperature and pressure 40.0 cm3 of 0.125 mol dm
- June 2018, Paper 3, Q2(a)(i) (5 marks): Process the results as outlined below. • On page 5, plot a graph of volume of O2 against time. • Use your graph to find the rate of the reaction, in cm3 s–1, at
- June 2017, Paper 1, Q19(a) (3 marks): Determine the total volume of oxygen, measured at room temperature and pressure, that the student should be prepared to collect in this investigation. Suggest a
- June 2017, Paper 1, Q19(b) (1 mark): Suggest a different experimental method that would allow the rate of this reaction to be followed over time. [1]
- June 2017, AS Paper 2, Q2 (6 marks): 2* A student was asked to carry out an experiment to determine the initial rate of reaction of zinc and hydrochloric acid. The student plans to collect a total
- June 2016, AS Paper 2, Q5(a)(i) (1 mark): Explain why there is a loss in mass during the reaction. [1]
- June 2016, AS Paper 2, Q5(c) (3 marks): Outline a method that could be used to obtain the results that are plotted on the graph. Your answer should include the apparatus required and the procedure for
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