Chemistry 9701/32 May June 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Enthalpy change determination for sodium carbonate and sodium hydrogencarbonate reactions with hydrochloric acid, including graphical extrapolation of temperature data.
2. Heat energy and enthalpy change calculations for reactions of Na₂CO₃ and NaHCO₃ using temperature change and mole ratios.
3. Error analysis in weighing and volume measurements, calculating percentage errors and evaluating experimental accuracy.
4. Identification of cations and anions in salts using qualitative analysis methods with sodium hydroxide and ammonia.
5. Gas evolution testing for CO₂ during reactions with carbonates and identification of H⁺ ions using suitable chemical tests.
6. Experimental refinement recommendations, assessing volume and mass adjustments for improved precision in calorimetric experiments.