Question

State whether the following reactions are exothermic or endothermic.

1) HCl + NaOH → NaCl + H2
O + Heat

2) CaCO3 → CaO + CO2

3) CaO + H2
O → Ca(OH)2
+ Heat​

Answer 1

Answer:

1.HCl + NaOH → NaCl + H2

O + Heat.....

Heat is released in the product side,as it is mentionedin the above reaction.So, it is an exothermic reaction because heat is evolved in exothermic reaction..

2.CaCO3 + CaO + CO2 is an endothermic reaction.

3.CaO + H2

O → Ca(OH)2

+ Heat

So, It is an exothermic reaction because heat is evolved in exothermic reaction.