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ICSE Class 8 Chemistry Question 3 of 5

Physical and Chemical Changes — Question 5

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Question 5

Give four differences between physical and chemical changes.

Answer
Physical ChangeChemical Change
In a physical change, no new substance is formed and the chemical composition of the substance remains the same. These are changes only in physical properties and state.In a chemical change a new substance with entirely different chemical composition and properties is formed.
The change can be reversible or irreversible.The change is permanent.
The change can be reversed by simple physical methods.The change cannot be reversed by simple physical methods.
Heat or light energy may or may not be released or absorbed.Heat or light energy are given out or absorbed.