Chemistry 9701/36 Oct Nov 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Reaction kinetics of Fe³⁺ and I⁻ ions, involving iodine production, thiosulfate titration, and time-dependent colorimetric analysis using starch as an indicator.
2. Moles and concentration calculations of reactants and products in redox reactions, rate expressions, and graphical analysis to correlate FeCl₃ concentration with reaction rate.
3. Modifications to reaction conditions (concentration doubling, reagent volume halving) and their effects on reaction time, measurement accuracy, and systematic errors.
4. Identification of ions in FB 4 and FB 5 using qualitative tests with EDTA, KI, NaOH, NH₃, and BaCl₂, alongside solubility and precipitate formation criteria.
5. Organic compound identification through reactions with 2,4-dinitrophenylhydrazine, acidified KMnO₄, and silver nitrate in ammonia solution, with oxidation state analysis of silver.
6. Practical guidance on water bath setup, precise reagent handling, and test-tube preparation for qualitative and quantitative chemical analysis.