AS & A Level Chemistry (9701) — May–June 2023, Paper 42
9 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Group 2 carbonates decompose when heated to form the metal oxide and carbon dioxide. Suggest a mechanism for the decomposition of the carbonate ion by adding two curly arrows in…
Answer this question and get it marked →State two typical chemical properties of a transition element.
Answer this question and get it marked →Complete Table 3.1 by placing one tick in each row to indicate the sign of each type of energy change under standard conditions: bond energy, enthalpy change of atomisation, and…
Answer this question and get it marked →In aqueous solution, iron(III) ions react with iodide ions: 2Fe³⁺ + 2I⁻ → 2Fe²⁺ + I₂. A series of experiments is carried out using different concentrations of Fe³⁺ and I⁻, as…
Answer this question and get it marked →Methylbenzene can undergo different reactions, as shown in Fig. 5.1: reaction 1 with H₂/Pt; reaction 2 with Br₂/UV light; reaction 3 with Br₂/FeBr₃ (giving two products). Draw…
Answer this question and get it marked →Perindopril is a drug used to treat heart disease (structure shown in Fig. 6.1). State the number of chiral carbon atoms present in one molecule of perindopril.
Answer this question and get it marked →Explain why phenol is brominated much more easily than benzene is brominated.
Answer this question and get it marked →Describe the difference in reactivity between chloroethane and chlorobenzene with OH⁻(aq). Explain your answer.
Answer this question and get it marked →Define standard cell potential, E°cell.
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