Chemistry 9701/34 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of water of crystallization (\\(x\\)) in hydrated sodium carbonate using titration with hydrochloric acid and sodium hydroxide, involving stoichiometric and molarity calculations.

2. Identification of Group 2 metal in \\(MSO_4 \\cdot 7H_2O\\) by mass changes upon heating, calculation of molar ratios, and determination of relative atomic mass using experimental data.

3. Reactions of solid ammonium vanadate with sulfuric acid, potassium manganate(VII), and other reagents to investigate redox changes and product formation.

4. Qualitative analysis of cations and anions in solutions using silver nitrate, ammonia, and sodium hydroxide; observations of precipitate formation and gas evolution.

5. Differentiation of aldehydes and ketones (ethanal vs. propanone) using Tollens’ reagent, with expected outcomes including silver mirror formation for ethanal.

6. Systematic observation recording for qualitative tests, emphasizing stoichiometric consistency, precipitate solubility, and gas identification during analytical procedures.