Chemistry 9701/33 May June 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of the relative molecular mass (Mr) of an organic acid (HA) using titration; precise volumetric measurements, stoichiometry of acid-base neutralization, and data-driven calculations.

2. Enthalpy change of neutralization experiment; volumetric additions, temperature changes, graphical extrapolation of temperature data, and calculations involving heat energy and moles.

3. Qualitative analysis of salts; identification of ions via precipitation reactions, color changes, solubility behavior, and gas evolution tests with systematic observation recording.

4. Use of standard cation and anion reaction tables to deduce ion identities based on precipitate formation, dissolution in excess reagent, and specific gas tests.

5. Techniques for reducing experimental errors in thermochemical and volumetric analyses; insulation improvements, use of calibrated equipment, and detailed observation protocols.

6. Practical application of redox reactions and qualitative tests for ion identification, including the role of indicators, reagent selection, and inference from observed chemical behavior.