Ozone Decomposition by UV
2O3 → 3O2
Tổng quan
UV-C radiation (< 240 nm) and UV-B (240–320 nm) break ozone back into molecular oxygen and atomic oxygen. This absorption of UV is precisely what protects life on Earth. The steady-state balance between ozone formation and decomposition maintains the ozone layer thickness.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Chất phản ứng | Ozone O₃ | 2 | (g) |
Ví dụ thực tế
Sunscreen with high SPF is needed because not all UV is filtered by ozone — the remaining UV-A and some UV-B still reach the surface.
Tầm quan trọng công nghiệp
Understanding ozone photochemistry is critical for monitoring the ozone hole and predicting UV exposure levels worldwide.
Tính chất
- Loại
- Photochemical
- Thuận nghịch
- Không
- Năng lượng
- Tỏa nhiệt
- ΔH
- -285,4 kJ/mol
Phản ứng liên quan
Cis-Trans Isomerization of Retinal
Silver Chloride Photodecomposition
Luminol Chemiluminescence
Firefly Bioluminescence (Luciferin Oxidation)
Photolysis of Water (Vacuum UV)
Photochemical Smog Formation (NO₂ Photolysis)
Photodegradation of Methylene Blue by TiO₂
Photodissociation of Chlorine Gas
Silver Bromide Photodecomposition
Chlorophyll Fluorescence
Frequently Asked Questions
What is the equation for Ozone Decomposition by UV?
The balanced equation is: 2O₃ → 3O₂.
What type of reaction is Ozone Decomposition by UV?
Ozone Decomposition by UV is a photochemical reaction.
Is Ozone Decomposition by UV exothermic or endothermic?
Ozone Decomposition by UV is exothermic (releases energy). The enthalpy change (ΔH) is -285.4 kJ/mol.