Chemistry 9701/35 May June 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Sulfur Peroxodisulfate and Iodine Reaction: The experiment to investigate the reaction rate between potassium peroxodisulfate and iodide ions, explaining the methods for measuring the reaction rate using sodium thiosulfate and starch indicator.
2. Reaction Rate and Concentration: Understanding how the volume of potassium peroxodisulfate (FA 1) affects the reaction rate, calculating the rate of reaction for each experiment and plotting results to analyze the relationship between concentration and rate.
3. Error Analysis and Improvements: Discussing the errors in measuring reaction time, calculating percentage error, and evaluating how changing the concentration of sodium thiosulfate affects the reaction time.
4. Volume Calculation for Reactions: Calculating the required volumes of reactants to achieve specific concentrations, and explaining how dilution and mixing affect the reaction rate.
5. Qualitative Analysis: Identifying cations and anions in unknown solutions by performing tests with reagents, and interpreting the results to deduce the chemical formulas of unknown salts.