Ozone Decomposition by UV
2O3 → 3O2
Обзор
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.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Реагент | Ozone O₃ | 2 | (g) |
Пример из жизни
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.
Промышленное значение
Understanding ozone photochemistry is critical for monitoring the ozone hole and predicting UV exposure levels worldwide.
Свойства
- Тип
- Photochemical
- Обратимая
- Нет
- Энергия
- Экзотермическая
- ΔH
- -285,4 kJ/mol
Связанные реакции
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.