Chemistry 9701/03 May June 2002 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of metal carbonate concentration: Conducting titrations to determine the concentration of hydrochloric acid (HCl) based on the reaction with sodium carbonate. Using mass data and temperature changes to calculate the relative atomic mass of the metal in the carbonate.
2. Preparation of equilibrium mixtures: Reacting solid carbonate with hydrochloric acid, recording temperature changes, and calculating the energy released. Using this data to determine the amount of heat produced and to calculate the moles of reactants involved in the reaction.
3. Ion identification: Using qualitative analysis methods to identify cations and anions in solution. Testing for precipitates, color changes, and gas evolution to deduce the ions present in the solution, including reactions with sodium carbonate, barium nitrate, and silver nitrate.
4. Complex testing procedures: Conducting tests for various ions in a mixture using reagents like dilute nitric acid, sodium hydroxide, and ammonia, and identifying the corresponding anions and cations based on observable reactions and solubility behavior.
5. Gas analysis: Identifying gases such as ammonia (NH₃), carbon dioxide (CO₂), and others through characteristic tests like color changes in litmus paper, limewater, and oxygen or hydrogen gas reactions.