Chemistry 9701/41 May June 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Copper reactions: Reactions of copper(II) with sodium hydroxide and concentrated hydrochloric acid, including ionic equations, reaction types, and resulting colors/products.
2. Chloride analysis: Calculation of empirical formula for a sulfur chloride based on titration data with silver nitrate.
3. Thermal decomposition: Decomposition of Group 2 nitrates, explaining trends in thermal stability across elements like strontium and calcium.
4. Amide decomposition: Predicting decomposition behavior of calcium and barium amides and writing corresponding equations.
5. Electron-pair repulsion: Predicting bond angles in NH2– ions, with explanations based on VSEPR theory.
6. Chlorate reduction and disproportionation: Reactions involving chlorate(V) ions, including disproportionation and ionic half-equations.
7. Electrochemical cells: Half-equations and overall reaction for lithium-iodine electrochemical cells, along with calculations for cell potential and time for lithium consumption.
8. Atomic orbitals and electron configurations: Identification of atomic orbitals (s, p, d), and explanations regarding cadmium's electronic configuration and its non-transition element status.
9. Ligand interactions: Understanding methylamine as a monodentate ligand and interpreting the structure of cadmium complexes.
10. Complex stability: The effect of temperature on stability constants, and prediction of complex formation based on stability constants.
11. Hydration and pH: Writing equations for methylamine’s behavior in water, and determining the Ka for benzoic acid.
12. Mass spectrometry: Using mass spectrum data to deduce molecular structure, fragmentation patterns, and identify compounds like C5H10O2.
13. Polymerization and reactions: Reactions of benzene with sulfur trioxide and other reagents, including reactions forming polyamides, co-polymers, and biodegradation behavior.
14. Alkene synthesis: Reactions to synthesize phenylethene from benzene, with suggested reagents, conditions, and reaction steps.