Chemistry 9701/42 Oct Nov 2009 | Cambridge AS Level Past Papers With Mark Scheme

1. Hydrolysis reactions of magnesium chloride, aluminum chloride, and silicon tetrachloride, producing hydroxides and oxides.
2. Chloride ion titration in meat products with silver nitrate, including mole calculations and ionic equations for sodium and potassium chlorides.
3. Iodination of benzene, enthalpy change calculations for iodine formation, and oxidation state changes of iodine and nitrogen.
4. Nitrogen oxide catalysis in acid rain formation, explained with chemical reactions.
5. Copper complex formation, Cu²⁺ electronic configuration, orbital splitting, and ammonia’s effect on color change.
6. Curcumin structure, functional group analysis, and reactions with bromine and KMnO₄ for product identification.