plumiDeducing orders from graphs and initial rates: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 11.1.3 Deducing orders from graphs and initial rates, 2019–2025, with mark schemes and examiner’s reports where available.
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Q18(a)(iii)
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All 47 questions on Deducing orders from graphs and initial rates, as a list
- June 2025, Unit 4, Q18(a)(iii) (3 marks): Plot a graph of the volume of potassium manganate(VII) solution against time. (3)
- June 2025, Unit 4, Q18(a)(iv) (3 marks): Use your graph to show that the reaction is first order with respect to hydrogen peroxide. You must show your working on the graph. (3)
- January 2025, Unit 4, Q18(b)(ii) (3 marks): Plot a graph of reaction rate against volume of hydrogen peroxide. (3)
- January 2025, Unit 4, Q18(b)(iii) (1 mark): State and justify the reaction order with respect to hydrogen peroxide by using your graph. (1)
- January 2025, Unit 6, Q4(a)(ii) (3 marks): Plot a graph of the concentration of In2– against time. (3)
- January 2025, Unit 6, Q4(a)(iii) (2 marks): Determine two successive half-lives for the concentration of In2–. You must show your working on the graph. (2) First half‑life Second half‑life
- January 2025, Unit 6, Q4(a)(iv) (2 marks): Deduce the order with respect to In2–. Justify your answer. (2)
- January 2025, Unit 6, Q4(a)(v) (2 marks): Explain why the results of this experiment do not allow the overall order of the reaction to be determined. (2)
- October 2024, Unit 4, Q18(c) (1 mark): Sketch a line on the axes to show how the concentration of ethanal affects the rate of this reaction. (1) Rate / mol dm–3 s–1 [CH3CHO] / mol dm–3
- October 2024, Unit 4, Q19(a)(ii) (3 marks): Show that the data in the table are consistent with the SN2 mechanism for this hydrolysis of 2‑bromobutane. (3)
- October 2024, Unit 6, Q2(b)(ii) (2 marks): A group of students investigated the kinetics of the reduction of peroxydisulfate ions by iodide ions in aqueous solution, as shown in Reaction 1. 2–(aq) + 2I–(
- October 2024, Unit 6, Q2(b)(iii) (2 marks): A group of students investigated the kinetics of the reduction of peroxydisulfate ions by iodide ions in aqueous solution, as shown in Reaction 1. 2–(aq) + 2I–(
- June 2024, Unit 4, Q16(a)(i) (3 marks): Calculate the initial rate of reaction, in mol dm–3 s–1, at 1000 K. You must show your working on the graph. (3)
- June 2024, Unit 4, Q16(a)(ii) (2 marks): Deduce the rate equation for this reaction at 1000 K, by determining two half‑lives. You must show your working on the graph. (2)
- January 2024, Unit 4, Q16(b)(i) (3 marks): Use the results in the table to deduce the order of Reaction 1 with respect to hydrogen peroxide, hydrogen ions and iodide ions. Justify each answer by referrin
- October 2023, Unit 4, Q3(a) (1 mark): Which graph shows a reaction that is zero order with respect to reactant Q? (1) [Q] A Time B Rate [Q] [Q] C Time D Rate [Q]
- June 2023, Unit 4, Q18(a)(i) (1 mark): Draw a best-fit line on the graph. (1)
- June 2023, Unit 4, Q18(a)(ii) (1 mark): State how the graph shows that the reaction is not first order with respect to nitrogen monoxide. (1)
- June 2023, Unit 4, Q18(a)(iii) (2 marks): Deduce the orders of reaction with respect to NO and O2 , using the data from experiments 1–6. (2) Order with respect to NO = Order with respect to O2 =
- June 2023, Unit 6, Q3(d)(iii) (1 mark): State the order of reaction with respect to iodine. Justify your answer by referring to your graph. (1)
- June 2023, Unit 6, Q3(e)(i) (2 marks): A graph of the concentration of propanone against time is shown. 0.20 0.15 Concentration of propanone / mol dm–3 0.10 0.05 0 0 5 10 15 20 25 30 Time / s The rea
- January 2023, Unit 4, Q17(a)(ii) (3 marks): The student’s results are shown. [I–(aq)] / mol dm–3 [H2O2(aq)] / mol dm–3 [H+(aq)] / mol dm–3 Rate / mol dm–3 s–1 Run 1 0.0210 0.0198 0.00105 0.00181 2 0.0105
- January 2023, Unit 6, Q2(b)(i) (2 marks): An experiment was carried out using this procedure. The results are shown. Time / s 50 320 750 1200 2050 3180 4020 Volume of HCl / cm3 24.5 22.0 18.5 15.5 11.0
- January 2023, Unit 6, Q2(b)(ii) (2 marks): Determine two successive half‑lives for the reaction. You must show your working on the graph. (2)
- January 2023, Unit 6, Q2(b)(iii) (1 mark): State the order of this reaction. Justify your answer. (1)
- October 2022, Unit 4, Q2(b) (1 mark): Which graph is correct for this reaction? (1) A B [H2] Rate Time [H2] C D [NO] Rate [NO]2 Time
- October 2022, Unit 6, Q4(b)(ii) (2 marks): Explain how the data collected indicates first order kinetics. Show your working on the graph. (2)
- October 2022, Unit 6, Q4(b)(iii) (2 marks): The student concluded that the reaction is first order overall. Explain whether or not this statement is valid. (2)
- June 2022, Unit 4, Q10(a) (1 mark): Which graph shows the rate of reaction on the vertical axis plotted against concentration of the reactant on the horizontal axis for a zero order reaction? (1)
- June 2022, Unit 4, Q10(b) (1 mark): Which graph shows the rate of reaction on the vertical axis plotted against concentration of the reactant on the horizontal axis for a first order reaction? (1)
- June 2022, Unit 4, Q20(a)(i) (2 marks): Deduce the order of reaction with respect to 2‑bromobutane and with respect to hydroxide ions. Justify your answers. (2)
- January 2022, Unit 4, Q18(a)(i) (4 marks): Deduce the rate equation for the reaction. Justify your answer using the data. (4)
- January 2022, Unit 6, Q3(c)(ii) (3 marks): Plot a graph of 1/t against the volume of KBr. Include a line of best fit. (3) 0 0
- January 2022, Unit 6, Q3(c)(iv) (1 mark): State the order of reaction with respect to bromide ions, using your graph. (1)
- January 2022, Unit 6, Q3(d) (1 mark): After investigating the effect on the rate of the concentration of bromate(V) ions and the concentration of hydrogen ions, the student obtained the graphs shown
- October 2021, Unit 4, Q1(c) (1 mark): Which of these graphs represents this zero order reaction? (1) Rate Rate [NH3] [NH3] A B [NH3] [NH3] Time Time C D
- June 2021, Unit 4, Q16(a)(i) (3 marks): Use the results to plot a suitable graph that can be used to show that the reaction is first order with respect to bromate(V) ions. (3)
- June 2021, Unit 4, Q16(a)(ii) (1 mark): State how your graph shows that the reaction is first order with respect to bromate(V) ions. (1)
- June 2021, Unit 4, Q16(b)(i) (2 marks): Use these results and your answer to (a) to deduce the orders with respect to Br– ions and H+ ions. (2) Br– ions H+ ions
- January 2021, Unit 4, Q20(b)(i) (3 marks): Experiment 1 The concentration of Br− ions is determined at different times. − ions and H+ ions are in large excess and The concentrations of BrO3 effectively c
- January 2021, Unit 4, Q20(b)(ii) (3 marks): Experiment 2 − ions and H+ ions are changed and the initial The initial concentrations of BrO3 rate of reaction is determined. The initial concentration of Br−
- October 2020, Unit 4, Q2 (1 mark): The rate of the reaction between two compounds, Y and Z, was investigated. The results are shown. Initial concentration of Y Initial concentration of Z Initial
- October 2020, Unit 4, Q3 (1 mark): The inorganic anti-cancer drug cis-platin, Pt(NH3)2Cl2, is hydrolysed by water to make it active. The reaction is + H3N NH3 H3N NH3 + Cl− Pt + H2O Pt Cl Cl Cl H
- October 2020, Unit 6, Q3(d)(ii) (3 marks): Plot a graph of reciprocal time (1/t) against volume of bromate(V) solution. (3)
- October 2020, Unit 6, Q3(d)(iii) (1 mark): State the order of reaction with respect to bromate(V) ions. Justify your answer. (1)
- October 2020, Unit 6, Q3(f) (2 marks): State the changes that you would make to the procedure to obtain the data needed to determine the overall rate equation for the reaction between bromide and bro
- January 2020, Unit 4, Q14 (1 mark): A reactant Q is converted into two products. Which of these graphs shows that this reaction is first order with respect to Q? Graph 1 Graph 2 [Q] Rate time [Q]
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