Ozone Decomposition by UV
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2O3 → 3O2
概要
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.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Ozone O₃ | 2 | (g) |
日常の例
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.
産業上の重要性
オゾンの光化学を理解することは、オゾンホールの監視や世界的な紫外線被曝量の予測に不可欠である。
特性
- タイプ
- Photochemical
- 可逆的
- いいえ
- エネルギー
- 発熱性
- ΔH
- -285.4 kJ/mol
関連する反応
Photochemical Smog Formation (NO₂ Photolysis)
Photochromism of Spiropyran
Chlorophyll Fluorescence
Photodegradation of Methylene Blue by TiO₂
Photodissociation of Chlorine Gas
Silver Bromide Photodecomposition
Cis-Trans Isomerization of Retinal
Photosynthesis
Ozone Formation by UV Light
Dye-Sensitized Solar Cell (Grätzel Cell)
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.