Chemistry 9701/53 Oct Nov 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Preparation of sodium ethanedioate standard solution, calculation of required mass, apparatus selection, and detailed procedural steps for accurate solution preparation.

2. Redox titration to determine potassium manganate(VII) concentration, calculations involving molar ratios, and analysis of titration data for precision and reliability.

3. Analysis of iron content in wire via manganate titration, determination of appropriate titre selection, percentage error calculations, and implications of experimental conditions on Fe²⁺ stability.

4. Determination of alkane molar mass using gas collection data, graphing relationships, anomalous data analysis, and application of the ideal gas law for molecular identification.

5. Experimental accuracy enhancements, including improvements in measurement techniques and addressing contamination effects on molar mass calculations.

6. Safety and reliability measures for experiments involving flammable gases, including consistent temperature equilibration to standardize molar mass determinations.