Chemistry 9701/12 May June 2018 | Cambridge AS Level Past Papers With Mark Scheme

1. Silicon Oxide and Reactions: Writing equations for the reaction of silicon with oxygen, explaining why SiCl4 has a low boiling point, and calculating the pH of the solution formed when SiCl4 reacts with water.
2. Thermodynamic Data and Calculations: Using entropy and enthalpy data to calculate the lattice energy of sodium oxide, explaining why the entropy change in its formation is negative, and determining the temperature above which the reaction becomes non-spontaneous.
3. Reaction Rate and Kinetics: Understanding the rate of reaction, determining the rate constant, and calculating the concentration of reactants using experimental data.
4. Electrolysis and Redox Processes: Identifying substances liberated at the anode and cathode during electrolysis, writing ionic equations for redox processes, and explaining the visual observations during electrolysis of molten calcium iodide.
5. Solubility and Decomposition: Understanding the decomposition of Group 2 carbonates, describing how the solubility of sulfates varies, and explaining the visual observations during the heating of calcium nitrate.
6. Transition Metal Chemistry: Analyzing the electronic configuration of transition metals, the structure of complexes, and the reasons for color in transition metal complexes.
7. Organic Reactions and Isomerism: Understanding the electrophilic substitution reactions of cumene, determining the products formed, and explaining how conditions affect isomer formation in aromatic rings or side chains.
8. Nitration of Phenol: Exploring the nitration mechanism of phenol, drawing the intermediate and products, and understanding the chemical reactivity of phenol compared to benzene.
9. Amino Acid Chemistry: Identifying functional groups in asparagine, explaining buffer behavior, and constructing peptide bonds between amino acids.
10. Steroid Chemistry and NMR Spectroscopy: Analyzing the structure of calcitriol, predicting its NMR spectra, and understanding the chemical reactions involved in its transformation.