Chemistry 9701/34 Oct Nov 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Identifying a metal in a hydrated salt (X•16H2O) through heating and calculating the number of moles of water lost, the number of moles of residue, and the relative atomic mass of the metal in the salt.
2. Determining the effect of heating conditions, such as whether to reheat the crucible, on the accuracy of the results for identifying the metal.
3. Using titration to determine the concentration of an alkali by measuring temperature changes during the neutralization of sulfuric acid with sodium hydroxide.
4. Plotting temperature data, determining the volume of reactants that cause the highest temperature, and calculating energy changes associated with the neutralization.
5. Discussing experimental improvements to increase accuracy, such as using better insulation or more precise temperature measurements.
6. Performing qualitative analysis to identify anions and cations in unknown solutions by testing their reactions with reagents like sodium carbonate, barium nitrate, and ammonia.
7. Writing ionic equations and explaining how to identify specific ions based on their reactions with different reagents.