Chemistry 9701/23 May June 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Atomic radius trends across Period 3, explanation of covalent and metallic radii, reasoning for differing measurements in noble gases.
2. Ionic radius comparison, explanation of differences in cation and anion sizes, calculation of sodium carbonate titration results, purity determination.
3. Standard enthalpy change definitions, combustion reactions, and thermochemical calculations for DME and methanol.
4. Reaction mechanisms for cracking hydrocarbons, reactions of but-2-ene with various reagents, isomerism in organic compounds.
5. Organic functional group identification in compound F, reactions with sodium bicarbonate and KMnO₄, reaction products, and structural formula predictions for isomers.