plumiProblem solving, variables and methods: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on P.1.1 Problem solving, variables and methods, 2019–2025, with mark schemes and examiner’s reports where available.
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Q3(b)(i)
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All 14 questions on Problem solving, variables and methods, as a list
- June 2025, AS Unit 3, Q3(b)(i) (1 mark): The filter paper was soaked in tap water prior to the experiment and then gently shaken to remove excess water before use. Suggest the reason that deionised or
- June 2025, AS Unit 3, Q3(b)(iii) (1 mark): Give the reason that the formation of any precipitate in part (b)(ii) will not interfere significantly with the formation of the red precipitate. (1)
- June 2025, AS Unit 3, Q5(d) (4 marks): Justify how the equipment and the procedure could be improved to give a more accurate value for the enthalpy change of the reaction. (4)
- January 2025, AS Unit 3, Q2(f)(ii) (1 mark): The student wanted to reduce the percentage uncertainty by using double the mass of magnesium. Give the reason why the experiment outlined in the procedure coul
- October 2024, AS Unit 3, Q1(b)(ii) (1 mark): Give a reason why the experiment described in (b)(i) may not produce the expected results for all the Group 2 carbonates in a school laboratory. (1)
- October 2024, AS Unit 3, Q2(c)(i) (1 mark): Give an improvement to the experimental method that will increase the accuracy of the calculated titre value. (1)
- October 2024, AS Unit 3, Q2(c)(ii) (1 mark): Give an improvement to the experimental method that will increase the accuracy of the calculated enthalpy change of neutralisation. (1)
- October 2024, Unit 6, Q2(c)(i) (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, AS Unit 3, Q1(c)(i) (2 marks): Give two reasons why the second set of apparatus gives a more accurate measurement of the volume of gas given off. Justify your answers. (2)
- June 2024, Unit 6, Q5(c) (4 marks): Another student carried out the experiment but did not titrate all the contents of the conical flask in Step 6. Instead they transferred the contents of the con
- January 2024, Unit 6, Q3(a)(i) (1 mark): Suggest why only an approximate volume of sulfuric acid was used. (1)
- January 2024, Unit 6, Q3(a)(iii) (1 mark): Give a possible reason why the flask was heated. (1)
- October 2022, Unit 6, Q1(b) (4 marks): Another cobalt salt, CoCl2.xH2O(s), decomposes when heated. CoCl2.xH2O(s) → CoCl2(s) + xH2O(g) Devise an outline procedure to determine the mass of water produc
- October 2020, Unit 6, Q3(d)(v) (2 marks): Another student accidentally measured 8.5 cm3 of potassium bromate(V) rather than 8.0 cm3 in Run 4. Explain whether or not this portion of potassium bromate(V)
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