Question

it usually happens during a chemical change
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Answer 1

Answer:

(≧▽≦)(≧▽≦)(≧▽≦)(≧▽≦)

Explanation:

optics, science concerned with the genesis and propagation of light, the changes that it undergoes and produces, and other phenomena closely associated with it. There are two major branches of optics, physical and geometrical. Physical optics deals primarily with the nature and properties of light itself.

Answer 2

Answer:

Na new substance is formed and it cannot be changed

Explanation:

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