What is a chemical reaction that gives off energy?

Apr 20, 2018

The thermite reaction.

$F {e}_{2} {O}_{3} + 2 A l \rightarrow 2 F e + A {l}_{2} {O}_{3}$

Explanation:

The thermite reaction, the reaction of iron oxide with aluminum

$F {e}_{2} {O}_{3} + 2 A l \rightarrow 2 F e + A {l}_{2} {O}_{3}$

gives off a lot of energy. Reactions that liberate heat are called exothermic

A lot of energy is released because aluminum's affinity for oxygen is much stronger than iron's affinity for oxygen.