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When water is added to calcium oxide, the container becomes hot. What does this indicate about the reaction?

Answer and explanation

Correct answer: It is an exothermic combination reaction

Calcium oxide reacts with water to form calcium hydroxide: \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\). Heat is released during this reaction, so the container becomes hot. Since two reactants combine to form one product, it is a combination reaction; because heat is released, it is exothermic. In contrast, a decomposition reaction involves one compound breaking down into two or more substances.

Related tags

ScienceClass-10Chemical-ReactionsCalcium-OxideExothermic-ReactionCombination-Reaction

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