Silver Chloride Photodecomposition
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2AgCl → 2Ag + Cl2
개요
Silver chloride darkens upon exposure to light as photons provide enough energy to reduce Ag⁺ to metallic silver. This photosensitivity of silver halides is the fundamental chemistry behind traditional photography. The released chlorine atoms combine to form Cl₂ gas.
참여 물질
| 역할 | 물질 | 계수 | 상태 |
|---|---|---|---|
| 반응물 | Silver Chloride AgCl | 2 | (s) |
| 생성물 | Silver Ag | 2 | (s) |
일상 속 예시
Traditional black-and-white photography relied on this reaction — light hitting AgCl-coated film created a latent image of metallic silver.
산업적 중요성
할로젠화 은 사진은 150년간 영상을 지배했습니다. AgCl은 햇빛에 검게 변하는 광변색 렌즈에 여전히 사용됩니다.
성질
- 가역 반응
- 아니오
- 에너지
- 흡열
- ΔH
- 254.0 kJ/mol
관련 반응
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 Silver Chloride Photodecomposition?
The balanced equation is: 2AgCl → 2Ag + Cl₂.
What type of reaction is Silver Chloride Photodecomposition?
Silver Chloride Photodecomposition is a photochemical reaction.
Is Silver Chloride Photodecomposition exothermic or endothermic?
Silver Chloride Photodecomposition is endothermic (absorbs energy). The enthalpy change (ΔH) is 254.0 kJ/mol.