Chemically, water is composed of hydrogen and oxygen.

The chemicals used in this experiment are hazardous.

When matter is changed chemically, chemical energy is given off.

Chemical engineering is the branch of engineering that deals with the application of physical and life sciences to create products and processes.

Chemical warfare is a form of warfare that uses chemicals to incapacitate or kill the enemy.

The chemical composition of the substance is still unknown.

Chemical weapons are banned under international law.

Cyanide is a highly toxic chemical compound.

Farmers use chemical fertilizers to increase crop yields.