How do reactants change into products during a chemical reaction?

Reactants change into products during a chemical reaction by change in a bond between atoms.

Explanation:

The chemical reaction starts with the reactants and when the chemical reaction ends we get the products. The reactants consist of atoms that are bound. This bond is broken and it gives rise to a new bond. This new bond gives rise to the product. The reactants are processed and finally we receive the product.

There are large number of chemical reactions. These reactions help us in understanding the matter and the various features associated with it.