Ozone Formation by UV Light
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3O2 → 2O3
概述
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.
参与者
| 角色 | 物质 | 系数 | 状态 |
|---|---|---|---|
| 产物 | Ozone O₃ | 2 | (g) |
日常示例
The ozone layer protects life on Earth from harmful UV radiation. Without it, rates of skin cancer and cataracts would skyrocket.
工业重要性
了解臭氧形成机制是监测臭氧层健康状况的基础，对气候变化研究和紫外线辐射防护政策具有重要意义。
属性
- 可逆
- 是
- 能量
- 吸热
- ΔH
- 285.4 kJ/mol
相关反应
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
Silver Chloride Photodecomposition
Dye-Sensitized Solar Cell (Grätzel Cell)
Frequently Asked Questions
What is the equation for Ozone Formation by UV Light?
The balanced equation is: 3O₂ → 2O₃.
What type of reaction is Ozone Formation by UV Light?
Ozone Formation by UV Light is a photochemical reaction. It is reversible under certain conditions.
Is Ozone Formation by UV Light exothermic or endothermic?
Ozone Formation by UV Light is endothermic (absorbs energy). The enthalpy change (ΔH) is 285.4 kJ/mol.