Chemistry 9701/42 Oct Nov 2021 | Cambridge AS Level Past Papers With Mark Scheme

1. Understanding the lattice energy of radium sulfide and calculations related to enthalpy changes, including formation and ionization energies.
2. Detailed calculations and explanations on the process of determining lattice energy, enthalpy changes of formation, and factors influencing lattice energy in comparison to sodium chloride.
3. Use of experimental data to calculate partition coefficients and explain changes in partitioning behavior in ethoxyethane-solvent systems.
4. Solubility product (Ksp) calculations and the effect of adding potassium iodide to a solution of lead(II) iodide, including related precipitation and solubility concepts.
5. Electrolysis of hydrogen chloride solution, including calculations for chlorine gas production, charge transfer, and the effect of temperature and spontaneity.
6. Analyzing the thermal decomposition of magnesium and strontium nitrates, including their solubility and reaction properties in water.
7. Using coordination chemistry concepts to describe the formation and properties of metal-ligand complexes, including calculations and mechanisms.
8. Understanding isomerism in organic compounds, particularly dicarboxylic acids, including their synthesis, reactions, and NMR analysis.
9. Electrophoresis of amino acids at different pH values and explaining the behavior and separation of alanine and glutamic acid.
10. Reactions of butylamine, basicity comparisons, and synthesis methods, including the influence of different functional groups and reagents in each case.