Chemistry 9701/43 Oct Nov 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Electron configurations for Cr³⁺ and Mn²⁺, explanation of oxidation states in different compounds, effects of acidity on oxidizing power.
2. Manganese reactions with SO₂, changes in oxidation states, the impact of pH on reactions involving MnO₂.
3. Molar calculations for pyrolusite analysis, determining the percentage of MnO₂ in a sample using titration results with KMnO₄.
4. Ligand bonding in transition metals, reaction rate studies, experimental data interpretation, mechanism deduction for ligand substitution reactions.
5. Protein synthesis, hydrolysis, and the formation of zwitterions, buffer solutions, and their role in maintaining pH, with applications in biological processes.
6. Chromatography principles, the use of mass spectrometry and NMR in structural analysis, including the identification of organic compounds based on spectra.