differentiate between physical and chemical change
Answers
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
Differences Between Physical and Chemical Change
Physical change
1.When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.
2.Physical change is a temporary change.
3.A Physical change affects only physical properties i.e. shape, size, etc.
4.A physical change involves very little to no absorption of energy.
5.Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.
Chemical change
1.When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
2.A chemical change is a permanent change.
3.Chemical change both physical and chemical properties of the substance including its composition
4.During a chemical reaction, absorption and evolution of energy take place.
5.A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
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