Chemistry 9701/41 Oct Nov 2018 | Cambridge AS Level Past Papers With Mark Scheme

1. Gas Chromatography and Mass Spectrometry: Identifying compounds responsible for peaks in a chromatogram based on intermolecular forces, calculating the percentage composition based on peak areas, and explaining the isotopes responsible for M+2 in halogenoalkanes.
2. Reaction Mechanisms: Drawing mechanisms for the reaction of methylpropene with hydrogen bromide and explaining the major product formed.
3. Partition Coefficients and Extraction: Explaining partition coefficients and calculating the mass of a compound extracted into dichloromethane based on its partition coefficient.
4. Ligands and Complexes: Drawing stereoisomers of a Cr3+ complex with C2O4^2–, explaining solubility product expressions for calcium ethanedioate, and calculating Ksp.
5. Transition Elements and Color: Determining unpaired electrons for transition elements, writing reactions for the decomposition of potassium manganate(VII), and explaining color origins in transition element complexes.
6. Cu Complex Reactions: Identifying products of reactions involving [Cu(H2O)6]2+, including precipitates, complexes, and chemical equations.
7. Isomerism in Pt Complexes: Drawing structures of cis-trans isomers of platinum(II) complexes, explaining why Pt(NH3)2Cl2 has no charge, and describing its anti-cancer role.
8. Solubility and Entropy: Predicting trends in solubility and entropy changes for Group 2 sulfates, writing equations for reactions involving methanol production, and calculating Gibbs free energy for reactions.
9. Electrochemical Cells: Writing overall cell reactions for a methanol-oxygen fuel cell, calculating cell potentials, and predicting effects of temperature on reaction feasibility.
10. Polymer Chemistry and NMR: Discussing the polymerization of polyhydroxyamide, explaining biodegradability, and drawing copolymer structures.