Chemistry 9701/22 March 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Reactivity and Bonding in Nitrogen Compounds: Explaining the unreactivity of nitrogen, writing equations for magnesium and lithium nitride formation, and describing the reaction of Li3N with water.
2. Ammonia Production: Discussing the industrial importance of ammonia, explaining its formation from ammonium chloride and calcium oxide, and identifying the oxidation states in nitrogen oxides.
3. Formation of Nitrogen Oxides: Writing equations for the formation of NO2, explaining the oxidation numbers in NO and NO2, and calculating bond enthalpy from given data.
4. Electrophilic Addition of NOCl: Understanding the mechanism of NOCl's electrophilic addition with ethene, identifying charges, lone pairs, and reaction intermediates.
5. Halogen Compounds and Boiling Points: Comparing boiling points of halogen compounds like F2, HCl, and CaF2, explaining trends, and writing relevant chemical equations for reactions of halogen compounds.
6. Complex Bonding and Reactions: Describing bonding in halogen compounds, including formation of co-ordinate bonds, and discussing the reactivity of different halogens with metals and solutions.