What is the different between physical and
Chemical change ?
Answers
Answer:
a change in the physical composition of material is known as physical change and a change in the chemical composition of the material is known as chemical change.
physical change is mostly reversible while chemical change is mostly non reversible.
example of physical change is melting ice.
example of chemical change is burning of paper.
When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged whereas when a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
Physical change is a temporary change while chemical change is a permanent change.
A physical change affects only physical properties i.e. shape, size, etc. while in chemical change both physical and chemical properties of the substance including its composition.
In a physical change, no new substance is formed while in chemical change is always accompanied by one or more new substance(s).
Physical change is easily reversible i.e original substance can be recovered but chemical changes are irreversible i.e. original substance cannot be recovered.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.
Some examples of chemical change are digestion of food, burning of coal, rusting, etc.