Question 5

Give examples to explain the difference between changes that can or cannot be reversed.

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Solution

Examples of Reversible Changes:
- Melting of Ice into water. By freezing the water we can obtain ice again.
- Folding a paper: By unfolding it, we can undo the change.
- Hot milk to cold milk: By boiling milk, we can make it warm.
Example of Irreversible Changes:
- Burning of candle.
- Bursting of crackers.
- Cutting of trees.

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Give examples to explain the differences between changes that can or cannot be reversed.

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Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.

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Rolling of chapatti and baking of chapatti are the changes that
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Question 15

Give one example in each case.
Change which occurs on heating but can be reversed.
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Q. Give an example in the given case:
(a) Change which occurs on heating but can be reversed.
(b) Change that occurs on heating but cannot be reversed.
(c) Change occurs on cooling but can be reversed.
(d) Change occurs on mixing two substances but can be reversed.
(e) Change which occurs on mixing two substances, but cannot be reversed.

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Question 5 Give examples to explain the difference between changes that can or cannot be reversed.

Question 5

Give examples to explain the difference between changes that can or cannot be reversed.