How are atoms in molecules being rearranged into different molecules?

We are talking about chemical reaction here. In a chemical reaction, substances that react are called reactants, and substances which are formed are called products. Atoms in the reactants break their bond, rearrange themselves and form new bonds to make the product. So no atoms are added or removed, which is called law of conservation of atoms/mass.

by: JuliettaGlassford

Through absorption

Explanation:

Absorption of light causes a molecule to rearrange its structure in such a way that atoms are lost and it becomes another chemical species. One biologically important photorearrangement reaction is the conversion of 7-dehydrocholesterol to vitamin D in the skin.

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Benjemin