Chemistry 9701/21 Oct Nov 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of x in the formula ZnSO₄·xH₂O, experimental design for heating and weighing, stoichiometric calculations for zinc sulfate hydration.
2. Reactions of hydrogen iodide and its equilibrium constant Kc, impact of temperature and pressure changes on equilibrium position, relationship between reactant concentrations.
3. The Haber process for ammonia production, essential operating conditions, laboratory preparation of ammonia, reaction mechanisms for ammonia formation.
4. Organic reactions and functional group identification, reactions of alcohols, carbonyl compounds, and carboxylic acids with common reagents like NaBH₄, Fehling's solution, and MnO₄⁻.
5. Functional group analysis of C₄H₈O₂ compound X, molecular structure and stereoisomerism, understanding the reactivity with sodium, bromine, and sodium hydrogencarbonate.