Chemicals are substances or compounds composed of one or more chemical elements. They can occur naturally or be man-made and are used in a wide range of applications including industrial production, agriculture, medicine, cosmetics and household products.

Chemicals can be classified into different categories such as organic and inorganic chemicals, alkaline and acidic chemicals, hazardous and non-hazardous chemicals and solid, liquid or gaseous chemicals.

It is important to know how to handle and store chemicals to guarantee health and safety and reduce their negative effects on the environment. Some chemicals are toxic, flammable or explosive and can be harmful.