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

1. Isomerism of Methylpropane and Butane: Explaining why methylpropane and butane are isomers and identifying the type of isomerism they exhibit.
2. Effect of Temperature on Equilibrium: Analyzing how increasing the temperature affects the equilibrium composition of a reaction between butane and methylpropane.
3. Dynamic Equilibrium in Butane Reaction: Interpreting experimental data to determine the concentration of butane and methylpropane at equilibrium, and calculating the equilibrium constant (Kc).
4. Trend in Volatility of Halogens: Describing the trend in volatility of chlorine, bromine, and iodine down Group 17, and explaining the effects of temperature and molecular forces.
5. Reaction of Hydrogen with Halogens: Stating the conditions required for chlorine to react with hydrogen, and providing the equation for the reaction between iodine and hydrogen.
6. Brønsted-Lowry Acid-Base Theory: Explaining the concept of Brønsted-Lowry acids and identifying the acid and conjugate base in the reaction between HCl and H2O.
7. Reaction of Period 3 Elements with Chlorine: Understanding the different behaviors of sodium chloride (NaCl) and silicon tetrachloride (SiCl4) when added to water, and explaining the differences based on bonding and electronegativity.
8. Chlorine in Water Purification: Explaining why chlorine is used in water purification and discussing its reactions with water, including the formation of HCl and HClO.
9. Reactivity of Alkanes and Alkenes: Discussing the types of reactions alkanes and alkenes undergo with chlorine, and explaining the formation of free radicals in the reaction with alkanes.
10. Viscosity and Polymerization: Describing how the viscosity of poly(phenylethene) solutions can be used to calculate the mean molecular mass, and discussing the effect of temperature on solution flow through a capillary viscometer.