# What are thermal decomposition reactions?

Reactions that occur when heat triggers the breakdown of a chemical compound.

#### Explanation:

A thermal decomposition reaction occurs when heat is applied to a compound causing it to decompose (break down) into multiple different chemical substances.

An example is when baking soda (sodium bicarbonate) is heated

$2 N a H C {O}_{3} \left(s\right) \rightarrow C {O}_{2} \left(g\right) + {H}_{2} O \left(g\right) + N {a}_{2} C {O}_{3} \left(s\right)$

Here is a video discussion of this reaction

video from: Noel Pauller