Chemistry 9701/31 May June 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Titration experiment to determine the concentration of sulfuric acid, using sodium hydroxide, phenolphthalein, and the reaction of NaOH with H₂SO₄, including calculations for moles of reactants.
2. Investigation of enthalpy changes using Hess' Law, reactions of magnesium with sulfuric acid and magnesium oxide with sulfuric acid, and heat energy calculation.
3. Reactions and tests for identifying anions and cations in solutions, including observations of precipitates and gas formation during tests with reagents like barium chloride, silver nitrate, and sodium hydroxide.
4. Stereoisomerism in organic compounds, analysis of functional groups, and prediction of molecular structures using reaction data.
5. Solubility experiments and graphical analysis of solubility data, prediction and explanation of exothermic vs. endothermic reactions, and the application of graphs for solubility behavior prediction.