Chemistry 9701/22 Oct Nov 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Subatomic particle behavior in electric fields, orbital energy distributions for Kr and Si, first ionization energy trends in d-block elements, and isotopic variation in hydron ions.

2. Acid-base behavior of Period 3 oxides, trends in maximum oxidation numbers, reactions of sodium and phosphorus oxides with water, and differences in melting points explained by bonding types.

3. Reactions and structures of Group 15 halides (PCl5, PCl3, NCl3), including bonding, hydrolysis reactions, optical isomerism, and the decomposition of NCl3 with gas pressure calculations.

4. Organic reaction types (e.g., oxidation, reduction, elimination), tests distinguishing structural isomers, NaBH4 reduction roles, and identifying organic products in multi-step synthetic pathways.

5. Infrared spectral analysis for functional group identification, structural elucidation of esters, and reaction mechanisms involving hydrocarbon chains and unsaturation testing with oxidation products.

6. Practical applications of chemical trends, bonding principles, and reaction observations in determining molecular structures, reaction mechanisms, and oxidation products in both inorganic and organic chemistry.