Question

State the four basic differences between a physical change and a chemical change.

Answer 1

PHYSICAL CHANGE	CHEMICAL CHANGE
In Physical Change no new substance or product is formed.	In a chemical change always new substances or products are formed.
Physical change brings a change in physical properties of matter only like shape size etc. i.e, melting of wax or candle.	In a chemical change, the molecular composition is completely altered and a new product is formed i.e, burning of wax.
It is generally a reversible change that can be reversed easily, for example, ice into vapours.	It is generally an irreversible change that cannot be reversed. for example cooking, baking, and burning.
A physical change does not involve high changes in energy.	A chemical change involve high changes in energy.