A molecule that speeds up a chemical reaction is called a catalyst.

Here's why:

* Catalyst: A substance that increases the rate of a chemical reaction without being consumed in the process.

* How it works: Catalysts provide an alternative reaction pathway with a lower activation energy, making it easier for the reaction to occur.

Important Note: While catalysts speed up reactions, they do not change the equilibrium point of the reaction. They simply allow the reaction to reach equilibrium faster.