This reaction has reached chemical equilibrium.

He received an official notice.

We achieved our goal and achieved success.

He is an expert in chemistry.

He said it's important to keep a balance between body and mind.

He lost his balance and fell.

He has the ability to change into a wolf.

This chemical reacts when heat is added.

This chemical reaction is very dangerous.

Thermochemistry is a branch of chemistry that studies the interaction of heat and matter.