BRAINCAKEOzone Layer
The ozone layer is a region of the stratosphere containing ozone, O3. It absorbs much of the Sun's harmful ultraviolet radiation, which can cause skin cancer and cataracts.
Ozone is formed and broken down naturally: O2 → 2O and O2 + O → O3. This balance has been upset by chlorofluorocarbons (CFCs), which were used in refrigerators and aerosols.
In the stratosphere, UV light breaks the C-Cl bond in CFCs to form chlorine radicals, for example CF2Cl2 → •CF2Cl + Cl•
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More in Alkanes
- Combustion
- Polluting the Atmosphere
- Flue Gas Desulfurisation
- Catalytic Converters
- Greenhouse Effect
- Carbon Neutral Activities
- Free-Radical Substitution
- Further Substitution
All 20 lessons in Alkanes · All AQA AS-level Chemistry topics