In the Library-Research Project Some chemical changes take place only in the presence of light. The study of such changes is called photochemistry (photo means light), and the changes are called photochemical reactions. Some common and useful chemical changes are described below. Find out about them and answer the questions: unlight and is resnonsible for providi
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In the Library-Research Project Some chemical changes take place only in the presence of light. The study of such changes is called photochemistry (photo means light), and the changes are called photochemical reactions. Some common and useful chemical changes are described below. Find out about them and answer the questions
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