Question

In which of these reactions is energy released? A. endothermic reactions B. no reactions C. exothermic reactions D. all reactions

Answer 1

Exothermic reactions release energy. Exo = out thermic = thermal (heat) energy

Answer 2

Answer is: C. exothermic reactions.

For example, the Haber process is procedure for the production of ammonia, in this process atmospheric nitrogen (N₂) is converted to ammonia (NH₃) and energy is released:

N₂ + 3H₂ ⇄ 2NH₃ ΔrH = -92 kJ/mol.

There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).