Chemistry 9701/12 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Identification of bonding and molecular properties of carbon allotropes, sulfur atomization enthalpy, and oxidation number changes in redox reactions.

2. Stoichiometric calculations in reactions involving copper carbonate decomposition, butane combustion, and equilibrium constant \\( K_c \\) determination for gaseous systems.

3. Factors influencing volatility of halogens, solubility trends in Group 2 hydroxides and sulfates, and thermal decomposition products of nitrates.

4. Reaction mechanisms for organic transformations, including nucleophilic substitution, electrophilic addition, ester hydrolysis, and dehydration processes.

5. Analytical differentiation between compounds using IR spectroscopy, 2,4-DNPH, and Tollens’ reagent, as well as chemical tests for alcohols and carbonyl compounds.

6. Catalytic converter chemistry involving the removal of CO, NO\\(_x\\), and hydrocarbons, and chemical behavior of HBr and HI under thermal conditions.

7. Synthesis and isomerism in hydrocarbons and polymers, including PVC properties, stereoisomer counts, and alkene hydration and halogenation.

8. Infrared spectroscopy and NMR spectral interpretation for product identification in reactions such as hydrogen cyanide addition and Friedel-Crafts alkylation.

9. General principles of reaction kinetics, activation energy factors, and rate changes with temperature, concentration, and catalyst usage.

10. Theoretical predictions for properties of a Group 1 element in Period 8, ionization energy trends, and implications for atomic radius and reactivity.