The reaction you provided, 2 H₂O₂ → 2 H₂O + O₂, is an example of a decomposition reaction. Here's why:

* Decomposition: A decomposition reaction involves a single reactant breaking down into two or more simpler products.

* Reactant: In this case, the reactant is hydrogen peroxide (H₂O₂).

* Products: The products are water (H₂O) and oxygen gas (O₂).

In essence, hydrogen peroxide decomposes into water and oxygen gas.

This reaction is also considered an exothermic reaction because it releases heat.