Chemistry 9701/52 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Determining the molecular mass of a soluble acidic gas, X, by measuring the mass of a known volume of gas, using different methods of gas collection.
2. Identifying the variables involved in the experiment, such as the independent and dependent variables, and discussing the importance of precise measurement techniques.
3. Calculating the number of moles of gas X in a given sample using the ideal gas law and determining the molecular mass (Mr) based on the collected data.
4. Discussing the effects of incomplete absorption of gas by soda lime on the accuracy of molecular mass calculations.
5. Exploring experimental conditions that may affect the calculation of Mr, including temperature and pressure variations, and suggesting improvements for reliability.
6. Identifying the formula of iron chloride produced through reactions with chlorine and hydrochloric acid, and explaining the differences in products based on electrode potentials.
7. Handling experimental errors, such as percentage errors in mass measurements, and suggesting modifications to improve the accuracy of results.
8. Analyzing the differences in chlorides of iron produced by two methods based on reaction conditions and electrode potential values.