AgCl + light 
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Photographic film consists of a thin layer of silver bromide coated on a celluloid strip. When the film is exposed to light, the silver bromide is converted to elemental silver. The fine particles of elemental silver formed appear as dark areas. This image is then chemically amplified to produce a negative when the film is developed. The darkening of silver bromide upon exposure to light is shown above. A key has placed on a bed of silver chloride (a white powder) and exposed to light. While most of the silver chloride has darkened, the area protected by the key during exposure remains white.
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b. Classify the reaction. c. The image above is very similar to the negatives you receive when you get your film developed. Why is it called a negative? |