Chemistry 9701/41 Oct Nov 2021 | Cambridge AS Level Past Papers With Mark Scheme

1. Calculations involving electrolysis, including determining the number of hydrogen molecules, total electrons, quantity of charge, and the current used in the experiment.
2. Calculation of bond energy and changes in enthalpy (ΔS, ΔH, and ΔG) for the electrolysis reaction of water.
3. Analysis of acid strength and pH in hydrochloric acid and 4-chlorobutanoic acid solutions, including calculations of [H+], pKa, and the ratio of concentrations in the solutions.
4. Calculation of sodium propanoate required for a buffer solution and explanation of the effect of adding dilute sulfuric acid to the buffer.
5. Definitions and equations related to electron affinity, ionization energies, and bond energy in chemical reactions.
6. Discussion of lattice energies and factors affecting them, along with calculations for the formation of calcium oxide and its enthalpy.
7. Predictions for decomposition temperatures and the solubility behavior of calcium and barium carbonates.
8. Mass calculations for CO2 produced during the decomposition of calcium carbonate and comparison with propane combustion.
9. Reactions of transition metal complexes, including equations and observations for cobalt and manganese compounds.
10. Structural isomerism in organic compounds and NMR spectroscopy analysis.
11. Synthesis routes for phenylethanoic acid and analysis of reaction mechanisms.
12. Investigation of acid-base reactions in organic chemistry, including distinguishing between ethylamine and phenylamine, and predicting reaction products.