Chemistry 9701/35 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Quantitative analysis involving titrations, determining the molarity of potassium manganate(VII), and identifying Group 1 metal ions in ethanedioate salts using stoichiometric calculations.

2. Determination of the water of crystallization (\\(x\\)) in hydrated manganese(II) sulfate, employing mass change measurements upon heating, and calculations involving mole ratios.

3. Qualitative analysis to identify cations and anions in salts using color changes, precipitate formation, solubility, and gas identification tests; reactions involving sodium hydroxide, ammonia, and other reagents.

4. Differentiation and identification of alcohols (butan-1-ol, butan-2-ol, methylpropan-2-ol) using reactions with potassium manganate(VII) and iodine under controlled conditions, along with equations for alcohol oxidation.

5. Analysis of qualitative data to deduce ionic equations, reaction types, and mechanisms, particularly in identifying anions through halide and sulfate tests and confirming gas evolution reactions.

6. Structural determination and confirmation of experimental results using qualitative techniques, stoichiometric calculations, and molecular property comparisons.