Chemistry 9701/21 May June 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Group 2 Elements: Explanation of trends in reactivity, ionization energies, and chemical behaviors in Group 2 elements such as calcium, strontium, and magnesium.
2. Element X Chemistry: Comparison of metal X and its compounds with Group 2 elements, including similarities, differences, and reaction behaviors with oxygen and carbonates.
3. Magnesium Silicide: Ionic bonding in Mg2Si, reaction of magnesium silicide with water, structure of SiH4, and polarity of C-H and Si-H bonds.
4. Methane and Silane Reactions: Explaining why SiH4 combusts in air without heating, the role of bond energies in methane combustion, and the reactions of SiH4 with oxygen.
5. Silicon Dioxide Chemistry: Reaction of silicon dioxide with sodium hydroxide, explanation of behavior and product identification in the reaction.
6. Ionization Energy: Understanding ionization energy graphs, predicting successive ionization energies, and explaining their significance with examples.
7. Chlorine Gas and Ideal Gas Law: Calculation of mass and number of atoms in Cl2, behavior of chlorine gas at different pressures and temperatures.
8. Organic Chemistry Reactions: Naming and identifying organic compounds with functional groups, understanding reactions with Tollens’ reagent, iodine, and sodium metal.
9. Nucleophilic Addition Mechanism: Explanation of nucleophiles, drawing stereoisomers, and understanding the product of reactions involving aldehydes and cyanide.
10. Functional Group Identification: Analysis of functional groups in organic compounds, drawing structures, and identifying reaction types, including for ethanal and its derivatives.