Question

short note on chemical change

Answer 1

Chemical changes occur when a substance combines with another to form a new substance, called chemicalsynthesis or, alternatively,chemical decomposition into two or more different substances. These processes are calledchemical reactions and, in general, are not reversible except by further chemical reactions.

Answer 2

A chemical change is a process where one or more substances are altered into one or more new and different substances. In other words, a chemical change is a chemical reaction involving the rearrangement of atoms. While a physical change can often be reversed, a chemically change typically cannot be, except through more chemical reactions. When a chemical change occurs, there is also a change in the energy of the system.