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what is a chemical reaction
When one or more substances (elements or compounds ) undergo a chemical change ,with the absorption or liberation of energy so as to form one or more new products ,then the change so taking place is collectively called a chemical reaction .That is, a chemical reaction is a change in which a new chemical  substance is formed .The substance that undergo chemical changes are called reactants and the new substances formed are called products .
  Example : 
The above reaction is a thermal decomposition reaction .


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