Chemistry 9701/41 May June 2021 | Cambridge AS Level Past Papers With Mark Scheme

1. Thermal stability of Group 2 hydroxides, solubility calculations for calcium hydroxide using \\( K_{sp} \\), and effects of NaOH on solubility.

2. Color formation in chromium complexes, structural diagrams of chromium ions, ligand properties, decomposition of ammonium dichromate with oxidation states, and chromium complex geometry.

3. Transition element definitions, physical properties comparison between calcium and iron, cell potential measurement setups, catalytic mechanisms involving \\( S_2O_8^{2-} \\), reaction energetics, and electron transfer explanations.

4. Reaction outcomes and ionic equations for \\( [Cu(H_2O)_6]^{2+} \\) with NaOH and NH\\(_3\\), identification of copper products in reactions with sulfuric acid, and reaction classification.

5. Rate determination for N\\(_2\\)O\\(_5\\) decomposition using concentration data, order verification with half-life, rate constant calculations, and mechanistic proposals for NO\\(_2\\) and O\\(_3\\) reactions.

6. Acid strength hierarchy and comparative analysis, functional group transformations in carboxylic acids, NMR spectral interpretation for organic compounds, and synthesis of polymers using dicarboxylic acids and diamines.

7. Organic synthesis pathways for amino acids, structural isomers with specified molecular formulas, stereoisomer analysis, and water solubility rationales based on molecular properties.

8. Buffer region explanations during titration of ethanoic acid with sodium hydroxide, equivalence point pH behavior, and stoichiometric calculations for the purity of ammonium vanadate.

9. Sequential organic reaction product identification from compound structures, C-13 NMR peak analysis, and synthetic reaction pathways involving halogenation, iodination, and esterification processes.