Chemistry 9701/34 May June 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Iodine and Sodium Thiosulfate Titration: Determining the concentration of sodium thiosulfate through redox reactions, iodine production via potassium manganate(VII), and titration with sodium thiosulfate solution.
2. Sodium Thiosulfate Reaction Rate Experiment: Investigating the effect of sodium thiosulfate concentration on the rate of reaction with sulfuric acid, using time measurements to monitor the formation of sulfur.
3. Qualitative Analysis of Cations: Identification of cations using precipitation and solubility tests, utilizing reagents like sodium hydroxide and ammonia to confirm the presence of metals such as aluminum and zinc.
4. Anion Identification and Chemical Reactions: Determining the anion in an unknown sample using various tests, such as reactions with barium chloride and copper sulfate, and understanding reaction mechanisms.
5. Error Analysis and Improvements: Calculating percentage errors in titration experiments, considering the impact of measurement accuracy, and suggesting improvements for increased precision.