During chemical change heat is absorbed or released .
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The enthalpy difference between the reactants and the products is equal to the amount of energyabsorbed from the surroundings. ... Because reactions release orabsorb energy, they affect the temperature of their surroundings. Exothermicreactions heat up their surroundings while endothermicreactions cool them down.
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During chemical change any thing can happen there can be gas released .. precipitate formed..or may be heat obserbed....
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