Chemistry 9701/43 May June 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Lattice energy, bond enthalpy calculations for magnesium oxide, experimental setup for measuring enthalpy changes, pH changes of oxides with water.
2. Nitrogen monoxide formation, bond enthalpy calculations, and reaction energetics, analysis of reaction order and rate law from experimental data.
3. Mechanism of nitrogen monoxide and hydrogen reaction, rate-determining step identification, reaction stoichiometry, and bond formation in complex reactions.
4. Indigo structure, functional group identification, and reaction types; laboratory synthesis and structural transformations; chemical tests for distinguishing indigo from leuco-indigo.
5. Halide reactions in Group IV elements, solubility and reaction behaviors of chlorides with water, explanation of molecular interactions in ionic compounds.
6. Polymerization of ethene, comparison of LDPE and HDPE structures, effect of side-chains on polymer properties, molecular geometry in conductive polymers, empirical formula determination.