Chemistry 9701/43 May June 2016 | Cambridge AS Level Past Papers With Mark Scheme

1. Reaction mechanisms and equations for chemical transformations involving limewater, Ba(OH)₂, and Mg(OH)₂ to test for CO₂, with explanations of solubility and reactivity differences in Group 2 carbonates.
2. Electronic configurations of cobalt and its ions, color changes upon reaction with HCl, and geometries of resulting complexes, including structural isomers of transition metal compounds.
3. Equilibrium expressions (Kp) and thermodynamic calculations for reactions involving hydrogen sulfide and methane, including entropy and Gibbs free energy impact on reaction feasibility.
4. Construction and application of electrochemical cells, standard electrode potentials, and Nernst equation-based calculations for varying ion concentrations.
5. Analysis of dicarboxylic acids' pKa values, trends in acidity relative to molecular structure, and buffer action of monosodium salts in food chemistry.
6. Reduction of nitrobenzene to phenylamine, yield calculations, and partition coefficients in solvent extractions, along with comparative basicity of phenylamine and ethylamine.