Salt that turns black in sunlight
Take some silver bromide in two dry watch glasses. Wrap one of
them with a black paper. Keep both of them in sunlight for some
What do you observe?
in which watch glass does the colour of silver bromide change?
Which form of energy was responsible for this chemical change?
This was due to the deposition of silver produced as a result of the
decomposition of silver bromide by the absorption of light.
What could be the reason forstoring certain medicines and chemicals
in brown bottles? Think of it
Chemical reactions which liberate or absorb light energy are known
as photochemical reactions
Electrochemical reactions
Let us do an experiment.
Answers
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can I ask what we want to do.
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The glass which is not covered with black paper contains silver bromide of different color.
Solar energy is responsible for this chemical changes.
Silver is very reactive type of metal.
Silver bromide in the presence of sunlight changes into BLACK color silver and bromine gas comes out.
When silver bromide comes in contact with sunlight then decomposition reaction takes place hence, silver bromide is a photosensitive material.
Generally silver bromide is kept in Brown shaded bottles to prevent photo decomposition.
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