The iodination of propanone: Edexcel International A Level Chemistry questions

Edexcel International A Level Chemistry past-paper questions on 11.1.4 The iodination of propanone, 2019–2025, with mark schemes and examiner’s reports where available.

All 15 questions on The iodination of propanone, as a list

June 2023, Unit 6, Q3(a) (1 mark): State why the sulfuric acid and propanone concentrations are both much larger than the iodine concentration. (1)
June 2023, Unit 6, Q3(b) (1 mark): State why sodium hydrogencarbonate is used in Step 3. (1)
June 2023, Unit 6, Q3(c) (2 marks): Name the indicator that would be used for the titration in Step 4, stating the colour change that would be seen at the end‑point of the reaction. (2)
June 2023, Unit 6, Q3(d)(i) (3 marks): Plot a graph of titre against time. (3)
June 2023, Unit 6, Q3(d)(ii) (1 mark): State why the volume of thiosulfate may be used for plotting the graph rather than the concentration of iodine. (1)
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
June 2023, Unit 6, Q3(e)(ii) (1 mark): A graph of the reaction rate against the concentration of sulfuric acid is shown. Rate Concentration of acid Deduce the rate equation for the overall reaction o
June 2022, Unit 4, Q11(a) (1 mark): Which method would be most suitable for following this reaction? (1) A colorimetry B timing how long the solution takes to go cloudy C quenching and titrating w
June 2022, Unit 4, Q11(b) (1 mark): The rate equation for this reaction is: rate = k[H+][CH3COCH3] Two experiments were carried out. In both experiments the concentration of propanone and iodine r
January 2022, Unit 4, Q12(a) (1 mark): The products of the reactions under the stated conditions include (1) Acidic conditions Alkaline conditions CH3I A CH3COO– CH3COCI3 B CH3COO– CH3COCH2I CH3I C C
January 2022, Unit 4, Q12(b) (1 mark): The rate equation for the reaction between propanone and iodine in acidic conditions is rate = k[H+][CH3COCH3] The reaction was carried out at two different pH
January 2021, Unit 4, Q7 (1 mark): Propanone reacts with iodine in the presence of a catalyst of dilute hydrochloric acid. The reaction occurs in aqueous solution. CH3COCH3 + I2 → CH3COCH2I + HI
October 2020, Unit 4, Q4(a) (1 mark): Which of the following is true? (1) A the units for the rate constant are dm3 mol−1 s−1 B the reaction is a first order reaction overall C the units for the rat
October 2020, Unit 4, Q4(b) (1 mark): Which of the following is not true? (1) A the reaction rate increases if the temperature is raised B the rate constant increases if the temperature is raised C

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