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Early Conquests of Ranjit Singh

Physical chan...

Question

Physical changes are mostly reversible. Give an example for its explanation.

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Solution

Most physical changes that involve a change in state are reversible. For example, melting of ice and evaporation are reversible as they involve a change in physical state.

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Q. Give one example for each of the following types of changes:
(a) physical changes.
(b) chemical changes
(c) reversible changes
(d) irreversible changes

Q. Fill in the blanks with the correct words.
1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
4. Breaking of glass is a .................... (physical/chemical) change.
5. .................... (Heating/Cooling) causes steam to change into water.

Q. Most physical changes are reversible. Give reasons with two examples.

Are all physical changes are reversible? if not, give an example of a physical change that is not reversible.

Are all the physical changes reversible? if not, give an example of a physical change which is not reversible.

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