Question

What are physical and chemical changes ? What is the difference between them?

Answer 1

Physical changes are the changes that change the physical traits of the substance, without making any change in their internal structure.

chemical change is one that affects the internal structure of the substance.

Comparison Chart BASIS FOR COMPARISON PHYSICAL CHANGE CHEMICAL CHANGE

Meaning	Physical change refers to a change in which the molecules are rearranged but their internal composition remains same.	Chemical Change is a process in which the substance transforms into a new substance, having different chemical composition.
Example	Tearing of paper, melting/freezing of water, cutting of trees, etc.	Burning of wood/trees/paper, rusting of iron, setting of curd, etc.
Nature	Reversible	Irreversible
Original matter	Can be recovered	Cannot be recovered
Involves	Change in physical properties of the substance, i.e. shape, size, color etc.	Change in chemical properties and composition of the substance.
Product Formation	No new product is formed.	New product is formed.
Energy	Absorption and evolution of energy do not take place.	Absorption and evolution of energy take place, during reaction