Chemical changes


 
 
Concept Explanation
 

Chemical Changes

 Chemical Change

            1.  When a new substance is formed after the change, it is called chemical change.

            2.  Chemical changes cannot be reversed by simple physical means.

           3.   Many chemical changes are irreversible.

           4.  Examples: Burning of candle, rusting of iron, etc.

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Sample Questions
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Question : 1

  When a new substance is formed after the change, it is called _______________ .

Right Option : B
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Question : 2

A chemical change may involve :

Right Option : D
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Question : 3

When iron rusts, it is an example of:

Right Option : B
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