Chemistry 9701/33 May June 2016 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of hydrochloric acid concentration through titration with sodium hydroxide, preparation of diluted solutions, use of bromophenol blue indicator, and calculation of accurate molar concentrations.
2. Identification of metal in a metal carbonate through reaction with hydrochloric acid, measurement of carbon dioxide volume, and calculation of molar mass and metal identity using gas laws and stoichiometry.
3. Qualitative analysis of aqueous organic compounds for functional group identification through reactions with Tollens’ reagent, sodium carbonate, and potassium manganate(VII), observing color changes, precipitates, and solubility.
4. Testing for anions in solids through reactions with sodium hydroxide, aluminum foil, and heat, using observations to deduce the presence of carbonate, nitrate, sulfate, or chloride ions.
5. Assessment of measurement errors and procedural limitations in volumetric analysis with suggested modifications to reduce discrepancies, ensuring precision in gas collection and titration.
6. Evaluation of practical chemistry skills, including data recording, observation accuracy, and systematic deduction of chemical properties and reactions.