key term - Activated Complex

Definition

This is an unstable arrangement of atoms that exists momentarily at the peak of the activation-energy barrier during a chemical reaction. It's the state of transition between reactants and products.

Related terms

Transition State:

Another term for activated complex; it represents the highest energy configuration of atoms during a chemical reaction.

Activation Energy:

The minimum amount of energy required to initiate a chemical reaction.

Potential Energy Diagram:

A diagram that shows the changes in potential energy that occurs during a chemical reaction; it helps visualize activation energy and activated complex.