Chemistry 9701/43 Oct Nov 2022 | Cambridge AS Level Past Papers With Mark Scheme

1. Calculation of enthalpy changes in ionic compounds, including hydration energies and lattice energies for KCl and MgCl2.
2. Explanation of lattice energy differences between MgCl2 and KCl, and the concept of enthalpy changes of atomisation and electron affinity.
3. Analysis of the solubility of potassium chloride and prediction of solubility changes with temperature using Gibbs free energy.
4. Understanding homogeneous and heterogeneous catalysts, including reaction mechanisms involving Fe2+ ions and peroxydisulfate.
5. Application of rate laws and calculations for reactions, such as determining rate constants and initial rates for the NO and O2 reaction.
6. Understanding complex ion formation, including the effect of ligands on color changes, stability constants, and the reactions involving Ni and Cu complexes.