Chemistry 9701/41 May June 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Solubility of Group 2 Hydroxides: Describing the trend in solubility of hydroxides down Group 2, including the relationship between lattice enthalpy and solubility.
2. Enthalpy Calculations: Using provided data to calculate enthalpy changes for reactions involving Ba(OH)2, CO2, and Ba(HCO3)2, and explaining how these values relate to the enthalpy change for similar reactions in other Group 2 compounds.
3. Bonding in Cyanic and Isocyanic Acids: Drawing dot-and-cross diagrams for HOCN and HNCO, analyzing bond angles and comparing bond lengths, and calculating the pH of isocyanic acid solutions.
4. Reaction and Equilibrium Calculations: Understanding the dissociation and hydrolysis of isocyanic acid, calculating pH and concentrations of hydroxide ions, and plotting pH changes over time.
5. Synthesis of Sodium Cyanate: Writing the equation for the reaction between urea and sodium carbonate to produce sodium cyanate, and analyzing the hydrolysis of organic isocyanates.
6. Transition Metal Complexes: Identifying oxidation states, coordination numbers, and drawing isomeric forms of transition metal complexes, and predicting stability constants.
7. Isomerism in Benzene Derivatives: Drawing structures for isomers of C9H11NO, identifying functional groups, and understanding their reactivity, including the mechanism for the conversion of carvone to X.
8. Reaction Mechanism for 1-Chloro-1-phenylethane: Analyzing the rate law, proposing a reaction mechanism, and predicting optical isomerism based on the mechanism.
9. NMR Spectroscopy: Using proton NMR to interpret spectra of 1-phenylethanol, predicting how the spectrum changes with D2O, and identifying the splitting pattern in the proton NMR spectrum.
10. Organic Reaction Pathways: Writing equations and suggesting reagents for reactions, including nucleophilic substitution, and discussing the isomeric products formed during reactions.