how can you know that the reaction is an exothermic reaction, when water is added to calcium oxide?
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Such a reaction is said to be endothermic if the energy is in the form of heat. The opposite of endothermic is exothermic; in an exothermic reaction, energy as heat is evolved. ... The formation of slaked lime (calcium hydroxide, Ca(OH)2) when water is added to lime (CaO) is exothermic.
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By the chemical changes in it
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