Reversible and Irreversible Change


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

Which of the following statements are correct:

(a) We see different types of changes, every day in our surrounding.

(b) Growth of tree, rising of sun, setting of sun, different shape and size of moon, burning of coal are examples of changes

(c) The Growth of tree is an example of irreversible change. .

Right Option : D
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Question : 3

Milk gets spoiled when not refrigerated, particularly in summers. This is called curdling or souring of milk, which is an __________________________ .

Right Option : C
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