Question

What is the difference between chemical change and physical change?​

Answer 1

Physical Change

• When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged
• Physical change is a temporary change.
• A Physical change affects only physical properties i.e. shape, size, etc.
• A physical change involves very little to no absorption of energy.
• Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.

Chemical Change

• When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
• A chemical change is a permanent change
• Chemical change both physical and chemical properties of the substance including its composition
• During a chemical reaction, absorption and evolution of energy take place.
• few examples of chemical change are digestion of food, burning of coal, rusting, etc.

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Answer 2

Answer:

A chemical change is a change which causes a substance to change into an entirely new  chemical with a new chemical formula.

A physical change is a type of change that can be seen, it means the substance only changed in the appearance of the substance, not its chemical composition.