Chemistry 9701/23 May June 2014 | Cambridge AS Level Past Papers With Mark Scheme

1. Definition and application of the mole concept, including stoichiometric calculations for hydrocarbon combustion reactions.
2. Structural and mechanistic analysis of hydrocarbons reacting with hydrogen bromide, explaining regioselectivity and stereochemical outcomes.
3. Quantitative analysis of hydrated salts through ammonia evolution and titration with sodium hydroxide and hydrochloric acid.
4. Equilibrium analysis of nitrogen dioxide and dinitrogen tetroxide systems, involving calculations for mole fractions, partial pressures, and equilibrium constants.
5. Reactivity trends of halogens with hydrogen and reactions with concentrated sulfuric acid, including observations and equations for halogen halides and sulfur dioxide formation.
6. Structural isomerism and stereochemistry in halogenoalkanes, including optical isomers and nucleophilic substitution mechanisms.
7. Environmental implications of CFCs as refrigerants, addressing their stability and harmful effects on the ozone layer.