Chemistry 9701/21 May June 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Quantitative determination of ammonium sulfate percentage in a fertilizer using acid-base titration, including environmental impacts of nitrogenous fertilizers (eutrophication).
2. Equilibrium principles for the catalytic oxidation of ammonia in the Ostwald process, with Kp calculations and reaction condition effects on yield.
3. Elemental and oxide properties in the Periodic Table: ionization energy trends, oxide reactivity with water, and amphoteric behavior identification.
4. Reaction mechanisms in organic chemistry: substitution, elimination, hydrolysis, and the corresponding reagents for specific transformations.
5. Crotonaldehyde reactivity analysis with Br₂, PCl₃, H₂/Ni, NaBH₄, and K₂Cr₂O₇/H⁺, with stereoisomer identification and structural representations.
6. Oxidation product analysis of organic compounds under cold/dilute and hot/concentrated manganate(VII) conditions.