plumiDetermination of rate equation: AQA A‑Level Chemistry questions
AQA A-Level Chemistry past-paper questions on 3.1.9.2 Determination of rate equation, 2008–2025, with mark schemes and examiner’s reports where available.
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Q09.5
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All 61 questions on Determination of rate equation, as a list
- June 2025, Paper 2, Q09.5 (1 mark): The rate equation for the reaction between a different bromoalkane (R2CHBr) and an aqueous solution of KOH is rate = k [R2CHBr] Which of these is a correct mech
- June 2025, Paper 3, Q02.1 (3 marks): The amount of thiosulfate is the same in each experiment. To allow the order of reaction with respect to each reactant to be calculated, several other variables
- June 2025, Paper 3, Q02.2 (3 marks): Deduce the order of reaction with respect to each reactant. Explain how you deduced the order of reaction with respect to iodide ions. [3 marks] Order with resp
- June 2025, Paper 3, Q02.4 (3 marks): In each experiment, 1.00 cm3 of 1.00 × 10–3 mol dm–3 sodium thiosulfate solution is used to react with the iodine initially produced. I2(aq) + 2 S2O32–(aq) → 2
- June 2025, Paper 3, Q02.5 (1 mark): The total uncertainty in the times recorded for each experiment is ±0.5 s but the stopwatch used has a measurement uncertainty of ±0.01 s Suggest why, in each e
- June 2025, Paper 3, Q02.6 (1 mark): Calculate the percentage uncertainty in the time recorded in experiment 3. [1 mark] Percentage uncertainty
- June 2025, Paper 3, Q02.7 (2 marks): The five experiments are repeated with the same stopwatch and the same concentrations and volumes of H2O2, I– and H+ Suggest and explain how the method can be c
- June 2024, Paper 2, Q01.1 (1 mark): Sketch a graph on the axes provided to show how, at constant temperature, the concentration of bromine changes during this reaction. [1 mark]
- June 2024, Paper 2, Q01.2 (5 marks): Table 1 shows the initial rate of this reaction for experiments using different mixtures containing propanone, bromine and hydroxide ions. Table 1 Experiment [C
- June 2024, Paper 2, Q01.3 (4 marks): Figure 1 shows an incomplete mechanism for this reaction. Figure 1 Complete the mechanism in Figure 1 by adding four curly arrows and any relevant lone pair(s)
- June 2024, Paper 2, Q01.4 (1 mark): Use evidence from the rate equation to explain why Step 1 is the rate determining step. [1 mark]
- June 2024, Paper 3, Q02.2 (1 mark): 20 g of large marble chips is a large excess of calcium carbonate. Suggest why using a large excess of calcium carbonate means that the rate is only affected by
- June 2024, Paper 3, Q02.3 (2 marks): The mass of carbon dioxide produced in time t is equal to mt. The total mass of CO2 produced during the reaction is equal to mtotal. Explain why (mtotal – mt) i
- June 2024, Paper 3, Q02.4 (3 marks): Table 1 shows the rate of reaction, calculated from the gradient of the curve, at five different times. (mtotal – mt) is proportional to the concentration of un
- June 2024, Paper 3, Q02.5 (1 mark): State how the graph in Figure 2 confirms that the rate equation for this reaction is Rate = k[HCl] [1 mark]
- June 2023, Paper 2, Q02.1 (3 marks): Complete Table 1 by calculating the missing values. [3 marks]
- June 2023, Paper 2, Q02.2 (2 marks): A suggested mechanism for the reaction is shown. Step 1 B + H+ → BH+ Step 2 BH+ + B → B2H+ Step 3 B2H+ + A → C + D Deduce the rate-determining step for this rea
- June 2022, Paper 2, Q01.4 (1 mark): An experiment was done to measure the time, t, taken for a solution of iodine to react completely when added to an excess of an acidified solution of butanone.
- June 2022, Paper 3, Q04.2 (2 marks): The graph in Figure 1 shows how the concentration of hydrogen peroxide changes with time in this experiment. Figure 1 Tangents to the curve in Figure 1 can be u
- June 2022, Paper 3, Q04.3 (2 marks): The concentration of hydrogen peroxide solution at time t during the experiment can be calculated using this expression. [ ] [ ] max 2 2 2 2 initial max H O H O
- June 2022, Paper 3, Q04.4 (2 marks): Plot the data from Table 5 on the grid in Figure 2. Draw a line of best fit. [2 marks] Figure 2
- June 2022, Paper 3, Q04.5 (2 marks): Use Figure 2 to determine the order of reaction with respect to H2O2 State how the graph shows this order. [2 marks] Order How the graph shows this order
- November 2021, Paper 2, Q10.1 (2 marks): Suggest why the 1.0 cm3 portions of the reaction mixture are added to an excess of NaHCO3 solution. [2 marks]
- November 2021, Paper 2, Q10.2 (2 marks): Suggest why the order of this reaction with respect to propanone can be ignored in this experiment. [2 marks]
- November 2021, Paper 2, Q10.3 (3 marks): Use the results in Table 5 to draw a graph of volume of sodium thiosulfate solution against time. Draw a line of best fit. [3 marks]
- November 2021, Paper 2, Q10.4 (2 marks): Explain how the graph shows that the reaction is zero-order with respect to iodine in the reaction between propanone and iodine. [2 marks]
- November 2020, Paper 2, Q01.1 (3 marks): Use the graph in Figure 1 to determine the initial rate of reaction for this experiment. State its units. Show your working on the graph. [3 marks] Rate Units
- November 2020, Paper 2, Q01.2 (2 marks): Another student reacted different initial concentrations of phosphinate ions with an excess of hydroxide ions. The student measured the time (t) taken to collec
- November 2020, Paper 2, Q01.3 (1 mark): Complete the diagram in Figure 2 to show how the hydrogen gas could be collected and measured in the experiments in Questions 01.1 and 01.2. [1 mark] Figure 2 T
- November 2020, Paper 3, Q04.4 (3 marks): During the experiment the concentration of cisplatin is measured at one-minute intervals. Explain how graphical methods can be used to process the measured resu
- June 2019, Paper 2, Q04.1 (1 mark): Complete Table 2 to show the initial rate of reaction of P in each experiment. [1 mark] Table 2 Experiment Initial rate / mol dm 3 s 1 1 1.6 × 10−4 2 3
- June 2019, Paper 2, Q04.2 (2 marks): Determine the order of reaction with respect to P and the order of reaction with respect to Q. [2 marks] Order with respect to P Order with respect to Q
- June 2018, Paper 3, Q01.1 (2 marks): Explain why the use of a large excess of H2O2 and I– means that the rate of reaction at a fixed temperature depends only on the concentration of H+(aq). [2 mark
- June 2018, Paper 3, Q01.2 (2 marks): Samples of the reaction mixture are removed at timed intervals and titrated with alkali to determine the concentration of H+(aq). State and explain what must be
- June 2018, Paper 3, Q01.3 (2 marks): A graph of the results is shown in Figure 1. Figure 1 Explain how the graph shows that the order with respect to H+(aq) is zero. [2 marks]
- June 2018, Paper 3, Q01.4 (3 marks): Use the graph in Figure 1 to calculate the value of k1 Give the units of k1 [3 marks] k1 Units
- June 2018, Paper 3, Q01.5 (1 mark): A second reaction mixture is made at the same temperature. The initial concentrations of H+(aq) and I–(aq) in this mixture are both 0.500 mol dm–3 There is a la
- June 2018, Paper 3, Q01.6 (1 mark): Draw a line of best fit on the grid in Figure 2. [1 mark]
- June 2018, Paper 3, Q01.7 (2 marks): Calculate the rate of reaction when [H+] = 0.35 mol dm–3 Show your working using a suitable construction on the graph in Figure 2. [2 marks] Rate mol dm–3 s–1
- June 2018, Paper 3, Q01.8 (6 marks): A general equation for a reaction is shown. A(aq) + B(aq) + C(aq) → D(aq) + E(aq) In aqueous solution, A, B, C and D are all colourless but E is dark blue. A re
- June 2018, Paper 3, Q13 (1 mark): A series of experiments was carried out to find the order of reaction with respect to reactant X. In these experiments, only the concentration of X was changed.
- June 2017, Paper 2, Q02.1 (1 mark): Draw a tangent to the curve at t = 0 [1 mark
- June 2017, Paper 2, Q02.2 (1 mark): Use this tangent to deduce the initial rate of the reaction. [1 mark Initial rate mol dm−3s−1
- Specimen, Paper 2, Q01.1 (3 marks): 3
- Specimen, Paper 2, Q02.1 (1 mark): Draw a tangent to the curve when the concentration of butadiene is 0.0120 mol dm–3. [1 mark] 0 2 . 1
- Specimen, Paper 2, Q02.2 (5 marks): 8
- June 2016, CHEM4 (old spec), Q6(a) (2 marks): Deduce the order of reaction with respect to D and the order with respect to E. [2 marks] Order with respect to D Order with respect to E Space for working
- June 2016, CHEM4 (old spec), Q6(b) (1 mark): Suggest why initial rates of reaction are used to determine these orders rather than rates of reaction at other times during the experiments. [1 mark]
- June 2016, CHEM4 (old spec), Q6(c) (2 marks): State how the initial rate is obtained from a graph of the concentration of the product against time. [2 marks]
- June 2016, CHEM4 (old spec), Q7(a) (1 mark): Suggest why the order with respect to iodine is zero. [1 mark]
- June 2015, CHEM4 (old spec), Q1(c) (1 mark): The reaction is zero order with respect to B. State the significance of this zero order for the mechanism of the reaction. [1 mark]
- June 2014, CHEM4 (old spec), Q3(a)(i) (1 mark): Deduce the order of reaction with respect to A. Tick () one box. [1 mark] Order of reaction with respect to A Tick () 0 1 2
- June 2014, CHEM4 (old spec), Q3(a)(ii) (1 mark): Deduce the order of reaction with respect to B. Tick () one box. [1 mark] Order of reaction with respect to B Tick () 0 1 2
- January 2013, CHEM4 (old spec), Q1(c)(i) (1 mark): Deduce the rate-determining step in this two-step process. (1 mark)
- January 2013, CHEM4 (old spec), Q1(c)(ii) (1 mark): Outline a mechanism for this step using a curly arrow. (1 mark)
- June 2011, CHEM4 (old spec), Q6(b) (2 marks): Using the rate equation and the overall equation, the following three-step mechanism for the reaction was suggested. X and Y are intermediate species. Step 1 NO
- January 2011, CHEM4 (old spec), Q1(b) (2 marks): Compound A reacts with compound B as shown by the overall equation A + 3B → AB3 The rate equation for the reaction is rate = k[A][B]2 A suggested mechanism for
- June 2010, CHEM4 (old spec), Q1(d)(i) (2 marks): Using the rate equation, predict which of the three steps is the rate-determining step. Explain your answer. Rate-determining step Explanation (2 marks)
- January 2010, CHEM4 (old spec), Q3(d) (2 marks): The following mechanism for the overall reaction has been proposed. Use the rate equation to suggest which of the four steps could be the rate-determining step.
- June 2008, CHM4 (2008 spec), Q2(a) (2 marks): 2 (a) The table below shows the results of three experiments to investigate the rate of reaction between compounds A and B. All three experiments were carried o
- June 2008, CHM5 (2008 spec), Q5(a) (2 marks): 5 (a) Use these curves and the dotted lines to deduce the order of the reaction with respect to iodide ions. Explain how you deduced the order. Order Explanatio
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