Ozone Formation by UV Light
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3O2 → 2O3
نظرة عامة
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.
المشاركون
| الدور | المادة | المعامل | الحالة |
|---|---|---|---|
| منتج | Ozone O₃ | 2 | (g) |
مثال من الحياة اليومية
The ozone layer protects life on Earth from harmful UV radiation. Without it, rates of skin cancer and cataracts would skyrocket.
الأهمية الصناعية
The Montreal Protocol (1987) banned CFCs that destroy ozone. Ozone generators are used for water purification and air treatment.
الخصائص
- النوع
- Photochemical
- قابل للعكس
- نعم
- الطاقة
- ماص للحرارة
- ΔH
- 285,4 kJ/mol