plumiCollision theory and activation energy: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 9.A.1 Collision theory and activation energy, 2019–2025, with mark schemes and examiner’s reports where available.
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All 22 questions on Collision theory and activation energy, as a list
- June 2025, AS Unit 2, Q9 (1 mark): In an experiment to measure the rate of reaction, a sample of magnesium ribbon, of mass 0.24 g, was added to 25 cm3 sulfuric acid, of concentration 1.00 mol dm–
- June 2025, AS Unit 2, Q10 (1 mark): Which change increases the proportion of particles in a reaction that have sufficient energy to react? A an increase in reaction temperature B a decrease in rea
- January 2025, AS Unit 2, Q17(b)(iii) (2 marks): Explain why a rate of reaction is greater at higher concentrations. (2)
- January 2025, Unit 4, Q18(c)(ii) (2 marks): The temperature of the reaction was changed to 75°C. Draw a line on the graph to show the possible results if this was the only change. Justify any similarities
- June 2024 (R), AS Unit 2, Q2 (1 mark): The reaction profile for a reaction is shown. X Products W Enthalpy Y Z Reactants Progress of reaction Which arrow represents the activation energy of the forwa
- June 2024 (R), AS Unit 2, Q3(a) (1 mark): Which change in property will not affect the rate of this reaction? (1) A concentration of hydrochloric acid B particle size of calcium carbonate C pressure of
- January 2024, AS Unit 2, Q13 (1 mark): Which statement best explains why the rate of a chemical reaction increases with increasing temperature? A the activation energy decreases B the number of colli
- January 2024, Unit 4, Q1(a) (1 mark): Some collisions between reactant molecules do not lead to the formation of products. What is the best explanation for this? (1) A the reactant concentrations ar
- October 2023, AS Unit 3, Q2(b) (2 marks): Explain why ethanoic acid is used and not hydrochloric acid. (2)
- January 2023, AS Unit 2, Q22(e)(i) (1 mark): Give one reason why a high temperature is needed in this reaction. (1)
- June 2022, AS Unit 2, Q15(b)(iii) (1 mark): The student repeats the experiment but uses hydrochloric acid with a concentration of 0.250 mol dm−3 . All other variables are kept the same. State what would h
- January 2022, AS Unit 2, Q24(e)(ii) (3 marks): Sketch the reaction profile for the forward reaction on the axes provided. Include labels for ΔH and the activation energy (Ea). Energy Reaction progress (3)
- October 2021, AS Unit 3, Q4(a)(ii) (1 mark): Sketch a line showing how the rate of reaction varies with temperature for this reaction. (1) Rate Temperature
- October 2021, AS Unit 3, Q4(c) (1 mark): State how you would change the conditions to make this chemical clock measure 40 s at 22 °C. (1)
- June 2021, AS Unit 2, Q22(e)(ii) (1 mark): In a closed bottle, the rate of this reaction decreases with time. Give a reason for this. (1)
- January 2021, AS Unit 2, Q1 (1 mark): The energy profile for a reaction is shown. Y X Energy products reactants Progress of reaction What is the minimum energy needed for this reaction to occur? A X
- October 2020, AS Unit 2, Q10(b) (1 mark): Which symbol represents the activation energy of the reaction P → R? (1) A u B v C w D x
- October 2020, AS Unit 2, Q11(c) (1 mark): Which sketch graph shows the rate of the reaction (y‑axis) plotted against time (x‑axis) during the reaction? (1) A B C D
- January 2020, AS Unit 2, Q18(d)(ii) (2 marks): Suggest why it is an advantage to carry out Reaction 1 at a high temperature. (2)
- January 2020, AS Unit 3, Q4(b) (2 marks): Step 2 6.0 g of solid potassium bromide is ground up into a fine powder using a pestle and mortar. The powder is then added to the round-bottomed flask contain
- June 2019, AS Unit 2, Q1 (1 mark): Calcium carbonate reacts with hydrochloric acid. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) Which factor does not affect the rate of this reaction? A con
- June 2019, AS Unit 2, Q2 (1 mark): The rate of a reaction doubles for each 10 K increase in temperature. If the temperature of this reaction is increased from 298 K to 358 K the rate of the react
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