Chemistry 9701/41 Oct Nov 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Reactions of SiCl₄ and PCl₅ with water, including equations and observations.
2. Quantitative determination of Fe²⁺ concentration via titration with KMnO₄, mass of dissolved Cu calculation, and enthalpy changes for reactions involving Si₂Cl₆.
3. Catalysis: homogeneous vs. heterogeneous catalysis explained with examples, including Fe-based systems.
4. Analysis of reaction pathways for SO₂, NO₂, and O₂, with reaction diagrams highlighting activation energy and enthalpy changes.
5. Capsaicin structural determination from stepwise reaction data, identifying key functional groups involved.
6. Analysis of compound G: functional group identification, reaction products with sodium metal, bromine, and iodine, and synthetic routes for dye H and compound L.
7. Protein structure and DNA analysis: bonding types in proteins, competitive vs. non-competitive enzyme inhibition, and complementary DNA strand identification.
8. Applications of analytical chemistry in forensic science: DNA fingerprinting, NMR and mass spectrometry analysis for crime scene samples.
9. Polylactide (PLA) properties: fermentation process, stereochemistry, biodegradability challenges, and co-polymerization with glycolic acid.