Give four differences between physical and chemical changes.

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Solution

Physical changes Chemical changes
1. In a physical change no new substance is formed and the chemical composition of substance
remains same but there are changes only in their physical properties and state. 1. In a chemical change new substance with entirely different chemical composition and properties is formed.
2. Temporarily change which can be reversed by simple physical methods generally 2. Permanent change and irreversible
3. Weight of original substance doesn’t change. 3. Weight of original substances may increase or decrease.
4. Energy like heat, light etc. may or may not be absorbed or released. 4. Energy like heat, light etc. are given out or absorbed.
5. Example: Melting of Ice 5. Example: Burning of candle

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Difference between physical change and chemical change with example

Question 1

Write any two differences between a chemical change and a physical change.

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Physical changes	Chemical changes
1. In a physical change no new substance is formed and the chemical composition of substance remains same but there are changes only in their physical properties and state.	1. In a chemical change new substance with entirely different chemical composition and properties is formed.
2. Temporarily change which can be reversed by simple physical methods generally	2. Permanent change and irreversible
3. Weight of original substance doesn’t change.	3. Weight of original substances may increase or decrease.
4. Energy like heat, light etc. may or may not be absorbed or released.	4. Energy like heat, light etc. are given out or absorbed.
5. Example: Melting of Ice	5. Example: Burning of candle