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WHAT IS CHEMICAL CHANGE?
A chemical change is a permanent change in which new substances are formed whose compositions and properties are completely different from those of the original substance 
Example  :  Raw vegetable  heat   > cooked vegetable

Characteristics of  chemical changes 

1.The chemical changes are permanent and cannot be reversed .
2.One or more new substances are formed .
3.The composition and the properties of the substance change .
4 .There is an exchange of energy during a chemical change .This means heat or light or both might be given out or consumed .


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