Chemistry 9701/32 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Quantitative analysis for determining the formula of the iodate ion (IOx\\(^-\\)) using redox reactions, iodine-thiosulfate titrations, and stoichiometric calculations.

2. Enthalpy change of solution (\\( \\Delta H_{\\text{sol}} \\)) for hydrated sodium thiosulfate measured by temperature change upon dissolution and Hess's Law cycle application to derive enthalpy changes for hydration.

3. Qualitative analysis for cation and anion identification in solutions using silver nitrate, ammonia, and thiosulfate tests; ionic equations and reaction observations recorded systematically.

4. Tests for redox reactions involving acidified iron(III) chloride and iron(II) sulfate with thiosulfate, potassium iodide, and hydrogen peroxide; color changes and precipitation reactions.

5. Use of Hess's Law in enthalpy determination, emphasizing energy cycles and their application to hydrated and anhydrous compound interconversions.

6. Reaction mechanisms, ionic equations, and product identification reinforced with qualitative and quantitative testing methods to confirm molecular interactions and compound structures.