Chemistry 9701/42 May June 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Enthalpy change of hydration, lattice energy calculation for MgCl₂, factors affecting hydration enthalpy, solubility comparisons between magnesium sulfate and barium sulfate.
2. Carbon monoxide production in internal combustion engines, catalytic converter reactions for CO removal, reaction mechanisms and catalytic properties of ruthenium complexes.
3. NMR and X-ray crystallography techniques, interpretation of spectra, identification of functional groups in compounds like lawsone and trihydroxynaphthalene.
4. Halogen reactivity trends and boiling point differences, molecular shape explanations for SF₆, and functional group analysis for organic acids and their acidities.
5. Liposome drug delivery systems, solubility enhancements with PEG, and functional group breakdown in drug molecules, particularly Sirolimus.