Give an example 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.
Example of irreversible changes: Burning of paper: When paper is burnt, it turns into ash. The ash cannot be turned back into paper.

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Similar questions

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

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.

Question 15

Give one example in each case.
Change which occurs on heating but can be reversed.
Change which occurs on heating but cannot be reversed.
Change which occurs on cooling but can be reversed.
Change which occurs on mixing two substances but can be reversed.
Change which occurs on mixing two substances but cannot be reversed.

Q. Explain the difference between the atom and the molecule of an element. Can a molecule of an element be the same as its atom? Give an example.

Q. Explain the difference between physical and chemical changes, giving one example of each.

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

Examples of reversible changes: Melting of ice into water: By freezing the water, we can obtain ice again. Example of irreversible changes: Burning of paper: When paper is burnt, it turns into ash. The ash cannot be turned back into paper.

Examples of reversible changes: Melting of ice into water: By freezing the water, we can obtain ice again.
Example of irreversible changes: Burning of paper: When paper is burnt, it turns into ash. The ash cannot be turned back into paper.