Chemistry 9701/21 Oct Nov 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Structure and bonding of aluminum, ceramic materials for insulating power cables, empirical and molecular formula calculations for aluminum chloride, sublimation properties.
2. Enthalpy change of formation, Haber process for ammonia synthesis, operating conditions, Brønsted-Lowry acid-base reactions, environmental effects of nitrate fertilizers on rivers and atmosphere.
3. Structural isomers and chirality in heptane, complete and incomplete combustion, free radical substitution mechanism with chlorine, environmental consequences of hydrocarbons.
4. Reactions of ethanol with Cr₂O₇²⁻ and alkalis, product identification, halogenoalkane reactions, intermolecular forces influencing product distillation.