Chemistry 9701/12 May June 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Tear Gas Reaction: Nucleophilic substitution of phenacyl chloride with NaOH, determining order of reaction with respect to the reactants, and predicting the rate law.
2. Solubility of Group II Sulfates: Trend in solubility down the group, enthalpy changes related to dissolution of Mg(OH)₂ and Sr(OH)₂, and solubility comparison in hot water.
3. Electronegativity and Dipole Moments: Discussion of why SF₄ has a dipole while SiF₄ does not, predicting dipoles in molecules like BCl₃, PCl₃, and SiCl₄.
4. Reactivity of Boron and Silicon Chlorides: Reactions of BCl₃ and SiCl₄ with water, with equations and reasoning for differences in reactivity.
5. Electrochemical Reactions: Understanding of Fe²⁺ oxidation in acidic solutions and the formation of different iron species under various conditions.
6. Polymerization and Organic Reactions: Polymerization of acrylonitrile, differences in reactivity of vinyl alcohol, and reactions involving acrolein with various reagents.
7. Nucleophilic Substitution Reactions: Analysis of nucleophilic substitution in halogenoalkanes, including bond-breaking and formation of products with NaOH.
8. Isomerism and Product Predictions: Structural isomerism in hydrocarbons and the impact on physical properties such as boiling point, as well as predicting products in organic transformations.
9. Environmental and Recycling Chemistry: Effects of sulfur dioxide emissions from vehicles, methods of reducing pollutants, and understanding of recycling processes for materials like glass, steel, and plastics.