Chemistry 9701/42 May June 2016 | Cambridge AS Level Past Papers With Mark Scheme

1. Types of bonding in magnesium nitrate hydrates, water arrangement around Mg²⁺, thermal decomposition reactions and mass percentage calculations. Stability trends in Group 2 nitrates and comparative decomposition of silver nitrate.

2. Weak acid concept, pKa and Ka relationship, influence of structural changes on acid strength. Voltage measurement setup in electrochemical cells, pH and Nernst equation applications.

3. Synthesis of methylethylamine and 2-methylpropylamine from 2-bromopropane, basicity comparisons between ethylamine and ammonia. Buffer solutions mechanisms using amines and salts.

4. Isomeric structures of Pt(NH₃)₂Cl₂ as anti-cancer drugs, polarity analysis, and stereochemistry in oxaloplatin and nickel complexes.

5. Stability constants and equilibrium calculations for cadmium complexes, enthalpy, and entropy differences influencing stability.

6. Enzyme specificity and hydrolysis of esters like phenyl ethanoate vs methyl benzoate, distinguishing methods through NMR spectra and chemical conversions.