Chemistry 9701/12 March 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Atomic Structure and Ionization: Identifying common and distinct subatomic particles in isotopes of Ar, K, and Ca, explaining trends in ionization energy across Period 3, and using ionization energy data to predict the group of an element.
2. Isotope Abundance Calculation: Determining the percentage abundance of sulfur isotopes, using relative atomic mass data for calculations.
3. Electron Configuration and Ionization: Analyzing electron configurations in sulfur and phosphorus, explaining ionization processes, and identifying orbitals from which electrons are removed during ionization.
4. Chemical Bonding and Molecular Shapes: Understanding bonding in sulfur and iodine compounds, including descriptions of lattice structures and co-ordinate bonding, and identifying redox reactions with reference to oxidation states.
5. Reactivity of Group 2 Elements: Investigating reactions of magnesium and strontium with oxygen, explaining the behavior of magnesium oxide in acid-base reactions, and understanding the solubility trends of Group 2 hydroxides.
6. Environmental Chemistry: Discussing the formation of sulfur dioxide and sulfuric acid from combustion reactions, the role of NO2 in SO2 oxidation, and the environmental impact of acid rain.