Chemistry 9701/43 May June 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Solubility of Group 2 Hydroxides: Describing the variation in solubility of Group 2 hydroxides, with emphasis on Ba(OH)2 and Mg(OH)2, and calculating enthalpy changes for reactions involving CO2 and hydroxides.
2. Enthalpy Changes for Reactions: Calculating standard enthalpy changes for reactions involving CO2, Ba(OH)2, and the formation of bicarbonates, explaining differences in enthalpy changes for Group 2 elements.
3. Cyanic and Isocyanic Acids: Drawing dot-and-cross diagrams for HOCN and HNCO, predicting bond angles, comparing bond lengths, and calculating pH for isocyanic acid solutions.
4. Synthesis and Reactions of Isocyanic Acid: Writing the equation for sodium cyanate preparation, predicting pH changes upon mixing, and analyzing the acid-base reactions in the presence of Ba(OH)2.
5. Cobalt Complexes and Coordination Chemistry: Understanding the formation of cobalt complexes with different ligands, predicting coordination numbers, and analyzing isomerism in transition metal complexes.
6. Organic Isomers and Reactions: Identifying functional groups in organic isomers, drawing structures based on experimental results, and discussing reaction mechanisms such as nucleophilic substitution.
7. Kinetics and Mechanism of Organic Reactions: Analyzing reaction rates for organic compounds, determining the order with respect to reactants, and drawing mechanisms with appropriate electron flow and intermediates.