plumiWJEC A‑Level Chemistry questions by topic
Every question from every WJEC A-Level Chemistry paper, 2016–2025, part by part. Filter by topic, paper or year, open the mark scheme under any question, and download a set as a PDF.
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Calculations
![Summer 2025 Unit 3, question 1: Complete the Arrhenius equation below. [1] k =](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-01-qp.webp)
![Summer 2025 Unit 3, question 2: Give a reason why SiCl4 reacts vigorously with water whilst CCl4 does not. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-02-qp.webp)
Q3(a)
The whole paper ↗![Summer 2025 Unit 3, question 3(a): State what is meant by the term heterogeneous in this context. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-03-a-qp.webp)
Q3(b)
The whole paper ↗![Summer 2025 Unit 3, question 3(b): Give an example of a heterogeneous catalyst and the reaction it catalyses. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-03-b-qp.webp)
![Summer 2025 Unit 3, question 4: Ethanedioic acid, (COOH)2, can be oxidised by acidified manganate(VII) ions. Use the half-equations below to write the ionic equation for the reaction. [1] _ _](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-04-qp.webp)
Q6(a)
The whole paper ↗![Summer 2025 Unit 3, question 6(a): Give the observation(s) expected when aqueous sodium hydroxide is added gradually to aqueous chromium(III) chloride until the sodium hydroxide is in excess. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-06-a-qp.webp)
Q6(b)(i)
The whole paper ↗![Summer 2025 Unit 3, question 6(b)(i): Name parts A and B. [1] A B](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-06-bi-qp.webp)
Q6(b)(ii)
The whole paper ↗![Summer 2025 Unit 3, question 6(b)(ii): Label the diagram to show the direction of flow of electrons in the wire. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-06-bii-qp.webp)
Q7(a)(i)
The whole paper ↗![Summer 2025 Unit 3, question 7(a)(i): Give a reason why all the entropy changes are positive. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-07-ai-qp.webp)
Q7(a)(ii)
The whole paper ↗![Summer 2025 Unit 3, question 7(a)(ii): The minimum temperature for decomposition of calcium nitrate is 1500 °C. Find the standard enthalpy change for this reaction. [3] kJ mol–1 Standard enthalpy cha](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-07-aii-qp.webp)
Q7(a)(iii)
The whole paper ↗
Q7(b)
The whole paper ↗![Summer 2025 Unit 3, question 7(b): Ammonium nitrate is a soluble salt. Suggest the pH of an aqueous solution of ammonium nitrate, giving a reason for your answer. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-07-b-qp.webp)
Q7(c)
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Q7(d)
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Q8(a)(i)
The whole paper ↗![Summer 2025 Unit 3, question 8(a)(i): Write an equation for this reaction. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-08-ai-qp.webp)
Q8(a)(ii)
The whole paper ↗![Summer 2025 Unit 3, question 8(a)(ii): Use oxidation states to show why this reaction can be described as disproportionation. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-08-aii-qp.webp)
Q8(b)(i)
The whole paper ↗![Summer 2025 Unit 3, question 8(b)(i): One method of studying the rate of this reaction is by sampling and quenching. State how you would quench the samples. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/1410u30-jun25-08-bi-qp.webp)
Q8(b)(ii)
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Q8(b)(iii)
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