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Calcium oxide reacts with water to form only calcium hydroxide, and the container becomes hot. Which conclusion is most complete?

Answer and explanation

Correct answer: It is both a combination and an exothermic reaction

The reaction is \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\). Since two reactants combine to form one product, it is a combination reaction. The container becoming hot shows that heat is released, so the reaction is also exothermic. In a decomposition reaction, one compound breaks into simpler substances, which does not occur here.

Related tags

ScienceClass10Chemical-ReactionsCombination-ReactionExothermic-ReactionCalcium-Oxide

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