What is meant by chemical raection?
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The reaction in which new substance is formed with new property is called chemical reaction.
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A reaction or chemical reaction is a chemical change which forms new substances. In other words, reactants react to form products that have a different chemical formula. Indications a reaction has occurred include temperature change, color change, bubble formation, and/or precipitate formation.
Always a new substance is formed. It cannot be back into previous stage, irreversible.
Like burning of paper into ashes.
Ashes can't form paper again.
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