Chemistry 9701/13 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Bonding and structural analysis of molecules, including carbon dioxide and silicon dioxide comparisons, buckminsterfullerene properties, and delocalized electron effects in carbon allotropes.

2. Reaction enthalpy calculations, pH determination for strong and weak acids, and periodic trends in Group 2 and 17 elements' properties such as solubility and volatility.

3. Mechanisms and stability in organic reactions, including electrophilic addition, substitution, and hydrolysis, with emphasis on product identification using IR and NMR spectroscopy.

4. Structural isomerism and stereoisomerism in alkenes, carbonyl compounds, and esters, including hydrolysis pathways and chiral center identification.

5. Thermodynamic principles in equilibrium constants, enthalpy of atomization, and catalytic reaction energy profiles, with industrial implications such as in the Haber process.

6. Analytical techniques for functional group identification using Tollens’ reagent, 2,4-DNPH, and acidified potassium dichromate for alcohols and carbonyl compounds.

7. Organic synthesis routes including alkyl halide transformations, nitrile hydrolysis, and carboxylic acid formation, focusing on intermediate reaction steps and reagent roles.

8. Combustion analysis of hydrocarbons for empirical and molecular formula derivation, and volumetric stoichiometry in gas-phase reactions involving alkanes and alkenes.

9. Role of catalysts in reducing activation energy, heterogeneous versus homogeneous catalysis distinctions, and their effects on oxidation states in chemical processes.

10. Trends in the reactivity, ionization energies, and atomic radii of elements in Groups 1, 2, and 17, highlighting periodicity and bonding variations in oxides and halides.