Reversible and Irreversible Change


Physical and Chemical Change I - Concepts
Class - 7th ISO 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

Cooking of food is an _________________ because we cannot get back the ingredients in their original from .

Right Option : B
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Question : 2

 When a change cannot be reversed, it is ________________________ .

Right Option : A
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Question : 3

Which of the following are correct ?

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

(b) When a change cannot be reversed, it is called irreversible change.

Right Option : C
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