Question

Are chemical changes always permanent changes? Why?

Answer 1

Answer:

The molecules of the substance do not change. New substances are formed always.Physical changes are those where no new substances are formed. ... Therefore, most chemical changes are permanent and irreversible.

Answer 2

When two or more substances undergo chemical change, the bonds between the atoms of the reactants are broken. These atoms rearrange to form a new product or a new substance. This process cannot be reversed by simple methods, so it is irreversible. Hence chemical changes are permanent changes.