Chemistry 9701/34 Oct Nov 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Sodium Thiosulfate and Acid Reaction: Investigating the effect of iodide concentration on the reaction rate, describing the experimental setup for measuring reaction times, and calculating reaction rates for various volumes of reactants.
2. Preparation of Solutions: Preparing a standard solution of ammonium persulfate, describing the method and apparatus needed, and explaining the use of starch to improve experimental accuracy.
3. Rate of Reaction Calculations: Using experimental data to calculate the rate of reaction, discussing possible improvements to ensure reliable results, and calculating the percentage error in volume measurements.
4. Experimental Errors and Adjustments: Identifying errors, such as incorrect equipment, and explaining how these affect results, and suggesting improvements like using less concentrated sodium thiosulfate.
5. Data Analysis: Plotting graphs to show the relationship between reaction rate and concentration, calculating reaction times for different volumes, and explaining any anomalies observed in the data.
6. Concentration and Rate of Reaction: Designing an experiment to investigate how hydrochloric acid concentration affects the reaction rate, using appropriate variables and measuring methods.
7. Qualitative Analysis of Solutions: Performing tests to identify anions and cations in various aqueous solutions, interpreting the results, and carrying out further tests to confirm identities.