Question

Define physical change and chemical change​

Answer 1

Physical Change:-

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

Chemical Change :-

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

Answer 2

Answer:

Physical Changes - When a substance undergoes a physical change, it does not give rise to a different kind of substance or there is no new substance is formed. A physical change is a reversible change. For example; heating of water melting of butter, cutting of paper etc.

Chemical Changes - A change in which one or more new substances are formed is called as a chemical change. Usually a chemical change involves a chemical reaction, which forms new products. For example : Rusting of Iron, or burning wood.