Ozone Formation by UV Light
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3O2 → 2O3
Обзор
Ultraviolet radiation (wavelength < 240 nm) splits O₂ molecules in the stratosphere. The resulting oxygen atoms combine with intact O₂ to form ozone (O₃). This Chapman cycle creates the ozone layer at 15–35 km altitude, which absorbs 97–99% of UV-B and UV-C radiation that would otherwise damage DNA.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Продукт | Ozone O₃ | 2 | (g) |
Пример из жизни
The ozone layer protects life on Earth from harmful UV radiation. Without it, rates of skin cancer and cataracts would skyrocket.
Промышленное значение
The Montreal Protocol (1987) banned CFCs that destroy ozone. Ozone generators are used for water purification and air treatment.
Свойства
- Тип
- Photochemical
- Обратимая
- Да
- Энергия
- Эндотермическая
- ΔH
- 285,4 kJ/mol