Chemistry 9701/21 May June 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Oxides of Period 3 elements, reactivity trends, acidity and basicity classification.
2. Ammonium sulfate analysis via titration, moles of NaOH and HCl in neutralization reactions, purity calculations for ammonium sulfate.
3. Methanol synthesis from CO₂ and H₂, enthalpy changes, reaction conditions, environmental advantages.
4. Ethene preparation from ethanol, reactions with hydrogen bromide and potassium manganate, structural changes and reaction types.
5. Organic compound analysis, functional group identification based on reactions with NaHCO₃, Na, Fehling's reagent, and 2,4-dinitrophenylhydrazine, oxidation and reduction processes for X.