Chemistry 9701/22 May June 2017 | Cambridge AS Level Past Papers With Mark Scheme

### 1. Atomic Structure and Isotopic Composition:
- Determining atomic and nucleon numbers for elements, calculating isotopic masses, and understanding the concept of relative isotopic mass.
- Applying the concept of isotopes to calculate relative masses.

### 2. Reactivity of Nitrogen:
- Explaining the unreactivity of nitrogen gas (N₂) and understanding its role in environmental processes such as acid rain and the effects of nitrate fertilizers on water quality.
- Discussing the formation of nitrogen oxides and methods to prevent their release from internal combustion engines.

### 3. Thermal Decomposition and Equilibria:
- Calculating enthalpy changes for reactions like the thermal decomposition of HBr.
- Explaining the effects of temperature changes on the rate of reaction, equilibrium shifts, and the percentage of decomposition based on Le Chatelier’s Principle.

### 4. Organic Chemistry:
- Drawing skeletal structures, identifying hydrocarbons, and explaining their chemical properties.
- Describing organic reactions such as hydrolysis, substitution, and oxidation, with specific focus on alcohols and the formation of products like tricarballylic acid.
- Discussing the mechanisms of reactions such as nucleophilic substitution and electrophilic addition.

### 5. Spectroscopy and Structure Identification:
- Analyzing infrared spectra and using them to identify functional groups in organic compounds.
- Explaining the significance of chiral centers and identifying geometrical isomerism in organic compounds.