Chemistry 9701/33 Oct Nov 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Titration and concentration calculation: Procedures for determining hydrochloric acid concentration using sodium hydroxide and methyl orange, including calculations for moles and concentrations.
2. Enthalpy change calculations: Determination of enthalpy changes for reactions of magnesium oxide and magnesium carbonate with hydrochloric acid, using Hess's Law for indirect measurements.
3. Thermochemical calculations: Use of temperature change data to calculate the energy produced, moles of reagents, and enthalpy changes for chemical reactions.
4. Experimental accuracy: Evaluating improvements for more accurate measurements and considering potential errors in the method, such as error in balance readings.
5. Qualitative analysis: Investigating reactions with hydrochloric acid, sodium compounds, and various tests to identify anions, and analyzing observations from chemical tests for the presence of specific ions.
6. Improvement suggestions: Recommendations for improving experimental design to enhance accuracy, including potential procedural adjustments rather than changes to apparatus.