Chemistry 9701/43 Oct Nov 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Electrochemical Cells: Discussing materials used in half-cells, calculating electrode potentials using the Nernst equation, and determining the overall cell potential for an electrochemical reaction.
2. Aluminum Production: Calculating the mass of aluminum produced from electrolysis, based on current passed over a given time.
3. Electrolysis of Chromium: Explaining why chromium metal cannot be obtained from dilute aqueous chromium(II) sulfate, based on electrode potential values.
4. Reaction Mechanism for ClNO2 and NO: Drawing and analyzing reaction mechanisms for the interaction between ClNO2 and NO, including the rate equation, units for the rate constant, and experimental data analysis.
5. Rate of Reaction and Concentration: Analyzing the variation in concentration of reactants and products in the ClNO2 and NO reaction over time, using graphs and data interpretation.
6. Entropy and Free Energy: Defining entropy, analyzing entropy changes in various processes, and using the Gibbs free energy equation to predict the temperature at which a reaction becomes spontaneous.
7. Hydrolysis and Reactions of Phenylethanone: Describing the hydrolysis of phenylethanone and identifying reactions and mechanisms for its treatment with various reagents.
8. Polymerization and Chemical Shifts in NMR: Drawing structures of monomers for polyamides and polyesters, and analyzing the C-13 NMR spectra for chemical shift ranges.
9. Electrophilic Substitution and Reactions of Butamben: Analyzing the base behavior and reactions of butamben, including its treatment with different reagents, and interpreting its proton NMR spectrum.
10. Mass Spectrometry of Butamben: Identifying fragments in the mass spectrum of butamben, including m/e values for specific fragments.