Chemistry 9701/42 Oct Nov 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Reaction of halogens with hydrogen and methane, bond energy calculations for chlorine and bromine, differences in ΔH values, and reaction mechanisms for halogenoalkanes.
2. Acetal formation with ethanal and methanol, reaction rate order determination, rate equation, and equilibrium constant calculations for the acetal reaction.
3. D-orbital theory in transition elements, color change in complexes due to ligand field splitting, and X-ray crystallography for atomic distance measurement.
4. Analysis of cracking conditions for hydrocarbons, reactions involving but-2-ene and its isomers, and polymerization to form poly(butene).
5. Identification of functional groups in organic compounds, reactions of alcohols, aldehydes, and ketones, and determination of molecular structures based on chemical tests.