Reversible and Irreversible Change


Physical and Chemical Change I - Concepts
Class - 7th Foundation NTSE Subjects
 
 
Concept Explanation
 

Reversible and Irreversible Change

Reversible Change:

When a change can be reversed easily, it is called reversible change. Examples:  Melting of ice, folding of paper, water turning into vapour, inflation of balloon, etc. The three physical states of water i.e. solid (ice), liquid(water) and gas (water vapour) are reversible and can be changed from one state to another by heating or cooling.

Irreversible Change:

When a change cannot be reversed, it is called irreversible change. Examples: Cooking of food, growth in a living being, burning of paper, etc.

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Sample Questions
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Question : 1

Which of the following are correct ?

(a)  When a change can be reversed easily, it is called reversible change.

(b) The example of reversible change are melting of ice, folding of paper, water turning into vapour, inflation of balloon, etc.

(c)The three physical states of water i.e. solid (ice), liquid(water) and gas (water vapour) are reversible.

Right Option : D
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Question : 2

Which of the following are correct ?

(a) Milk gets spoiled when not refrigerated, particularly in summers is an irreversible change.

(b) Cooking of food is an irreversible change because we cannot get back the ingredients in their original form.

Right Option : B
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Question : 3

The three physical states of water i.e. solid (ice), liquid(water) and gas (water vapour) are _______________  change.

Right Option : A
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