Chemistry 9701/04 May June 2008 | Cambridge AS Level Past Papers With Mark Scheme

1. Determining the electrochemical cell potential (E°cell) for the reaction between chlorine gas and iron(II) ions, calculating the electron flow through the voltmeter, and identifying components of the electrochemical cell.
2. Using enthalpy data to calculate the standard enthalpy change (ΔH°) for the dissolution of iron(III) chloride and calculating the E° for a reaction involving copper.
3. Studying the properties and reactions of Group IV oxides, such as CO₂, SiO₂, and SnO₂, and explaining differences in melting points and stability.
4. Understanding the structure of silicon tetrachloride (SiCl₄), its molecular shape, and the trends in volatility for Group IV chlorides.
5. Analyzing the properties and reactions of halogens, including the decomposition of chlorine dioxide, industrial production of chlorine, and environmental consequences of sulfur dioxide emissions.
6. Exploring the formation of biodiesel from triglycerides, including chemical processes, structural formulas, and the environmental benefits of biodiesel production.
7. Comparing the reaction mechanisms of ethene and benzene with bromine, highlighting differences in intermediates and reaction types.
8. Investigating the synthesis of various polymers and understanding the differences between addition and condensation polymerization methods.
9. Understanding the properties of proteins, including primary, secondary, and tertiary structures, and explaining how amino acid substitution affects protein function.
10. Discussing techniques like electrophoresis, NMR spectroscopy, and mass spectrometry for identifying molecules, including the analysis of bromomethane traces and the impact of drugs like insulin on patients.