Chemistry 9701/23 May June 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Bonding and molecular geometry of CS₂ with dot-and-cross diagrams, linear shape, and bond angles of 180°, and complete combustion to CO₂ and SO₂ with enthalpy changes.
2. Le Chatelier’s Principle application to methanol synthesis, emphasizing effects of temperature and pressure on equilibrium yield and reaction dynamics.
3. Equilibrium composition calculations for CO₂-H₂ reaction to CO and H₂O using initial conditions, stoichiometry, and equilibrium constant (Kc) relationships.
4. Identification of Periodic Table elements based on physical and chemical properties, including atomic radius, melting point, and molecular behavior in Period 3 oxides.
5. Structural and thermal properties of oxides (Na₂O, SiO₂, SO₂, Cl₂O₇), their reactions with water, and resultant products from inter-oxide reactions.
6. Reduction and dehydration pathways for heptan-2-one, with reagent conditions for Tollens’, HCN, and K₂Cr₂O₇ reactions, leading to identification of derivatives and isomers.
7. Allyl alcohol's chemical reactions as a primary alcohol and alkene, including oxidation, halogenation, and addition reactions, along with isomerism analysis between allyl alcohol and propanal.