Question

what happened when water is added to calcium oxide? it is exothermic or endothermic?what other type of reaction is this​

Answer 1

Answer:

When calcium oxide and water react, they do so to give out calcium hydroxide and heat.

Hence, it is an exothermic reaction, since heat is evolved.

CaO(s) + H₂O(l) ----------> Ca(OH)₂(aq) + Heat

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Answer 2

Answer:

• When Calcium oxide (CaO) is added to water, it forms calcium hydroxide ${\sf{[Ca(OH)_2].}}$

Reaction :

${\sf{CaO + H_2O \rightarrow Ca(OH)_2}}$ + Heat

• It is an exothermic reaction as it involves liberation of large amount of heat.

• The above reaction is an example of combination reaction.

• A combination is a type of reaction in which the reactants combine with each other to form products.
• Other type of reactions are : Decomposition reaction, Displacement reaction, Double displacement reaction and Redox reaction.