The reaction you've provided is actually incomplete: it's missing the products. The full reaction is:

2 H₂O₂ (aq) → 2 H₂O (l) + O₂ (g) (with MnO₂ as a catalyst)

This reaction is a decomposition reaction, where one reactant (hydrogen peroxide, H₂O₂) breaks down into two or more products (water, H₂O, and oxygen, O₂).

Here's a breakdown:

* Reactant: Hydrogen peroxide (H₂O₂)

* Products: Water (H₂O) and Oxygen (O₂)

* Catalyst: Manganese dioxide (MnO₂)

The Role of the Catalyst

Manganese dioxide (MnO₂) acts as a catalyst in this reaction. Catalysts speed up the rate of a reaction without being consumed themselves. In this case, MnO₂ helps break down hydrogen peroxide into water and oxygen more quickly.

Important Note: The decomposition of hydrogen peroxide is an exothermic reaction, meaning it releases heat.