9701/42 · May/June 2025

Thermal decomposition of Group 2 nitrates and the pH of a strontium hydroxide solution.

Reactions and colours of cobalt(II) complexes, d-orbital splitting in a tetrahedral complex, and using E⦵ values for hydrogen peroxide as oxidant and reductant.

What entropy is, entropy changes at melting and boiling, and ΔG for reducing iron(III) oxide.

Orders of reaction, rate-determining steps and mechanisms, and finding a rate constant from a rate graph.

Conjugate acid-base pairs, Ka calculations for a weak acid, and buffers.

Nitration of methylbenzene, why phenol reacts more easily, reactions of 2-nitrophenol, relative acidities, and functional groups in a drug.

Enantiomers of an amine, basicity of amines, forming amides, and addition vs condensation polymers.

Carbon-13 and proton NMR of an ester: reference, solvent, number of peaks and splitting.

A dipeptide from serine and lysine, isoelectric points and separating amino acids by electrophoresis.