Chemistry 9701/11 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Oxidation-reduction reactions, hybridization and molecular bonding in organic compounds, combustion of ethane, and energy changes associated with bond formation and atomization.

2. Periodic trends in melting points, lattice structures, and stability of oxidation states; thermal decomposition of nitrates and gas volume calculations under standard conditions.

3. Identification of alkenes, alcohols, and carbonyl compounds using qualitative tests like Tollens' reagent and Fehling's solution, with predictions based on structural features.

4. Mechanisms of halogenoalkane elimination reactions, polymer bond angles in poly(propene), and reactivity trends in halogens and halides with ammonia and acids.

5. Organic product identification from ester hydrolysis, diols formed via alkene oxidation, and bond energy analysis for catalytic processes.

6. Environmental implications of chlorofluoroalkanes in ozone depletion, polymerization sequences in dichlorinated ethene isomers, and radical generation by ultraviolet radiation.