Question

question 3 of 27
the thermochemical equation for the reaction in which calcium carbonate breaks down is shown below. how can the reaction be described?
caco₃(s)+179 kj→co₂(g)+cao(s)
a. it is exothermic.
b. it is endothermic.
c. it has a low activation energy.
d. it has a high activation energy.

Explanation:

In an endothermic reaction, heat is absorbed. The given thermochemical equation shows that 179 kJ of energy is on the reactant side, meaning heat is absorbed for the reaction to occur. Exothermic reactions release heat. Activation energy is not indicated by the heat term in this equation.

Answer:

B. It is endothermic.