Chemistry 9701/21 Oct Nov 2009 | Cambridge AS Level Past Papers With Mark Scheme

1. Standard electrode potential, Fe³⁺/Fe²⁺ electrode setup, equilibrium constant (Kc) calculation, and Kc units.
2. Ethyl ethanoate hydrolysis kinetics, first-order reaction confirmation, HCl concentration effect, rate constant derivation.
3. Transition element compound reactions: oxidation, reduction, ligand exchange, acid-base, precipitation processes, catalytic behavior.
4. Aluminum mass percentage in alloys, hydrogen production via reaction with NaOH, stoichiometric calculation.
5. Nitrogen molecule reactivity, NOx formation, environmental effects, comparison of amine basicities with ammonia.
6. Organic intermediates in pharmaceuticals, reaction types, reagents, and conditions for transformations, isomeric structure identification.