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When water is added to calcium oxide, the container becomes hot. Which conclusion is correct from this observation?

Answer and explanation

Correct answer: Heat was released in the reaction.

A hot container shows that heat is released to the surroundings during the reaction, so it is an exothermic reaction. Calcium oxide reacts with water to form calcium hydroxide: \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2 + heat}\). It is not merely a physical change because a new substance, calcium hydroxide, is formed.

Related tags

ScienceClass-10Chemical-ReactionsExothermic-ReactionCalcium-OxideCalcium-Hydroxide

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