Chemistry 9701/21 Oct Nov 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. VSEPR theory application for molecular shapes and bond angles, including dot-and-cross diagrams and geometrical structures for TeF6.

2. Bond angle predictions for alkenes, reaction mechanisms for halogenation of alkenes, and identification of structural isomers formed in reactions with cyclopropane.

3. Electrolysis of brine in a diaphragm cell with half-equations for electrode reactions, material selection for electrodes, and chemical reactivity of chlorine with sodium and phosphorus.

4. Quantitative titration for weak diprotic acids, molecular mass calculations, identification of molecular structures, and interconversion between stereoisomers and their reactions with sodium and carbonates.

5. Combustion reactions of alkanes, enthalpy change definitions, energy calculations using experimental data, and boiling point trends in hydrocarbons influenced by molecular structure and branching effects.