How to differentiate between physical and chemical and biology in hindi?
Answers
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.