Chemicals are substances formed by chemical union of two or more elements or ingredients in definite proportion by weight. They are produced by or used in a reaction involving changes in atoms or molecules.
Generally, "chemicals" refers to a much wider class of substances that includes many mixtures of chemical substances that often find application in many vocations. There are two major types of chemicals:
Inorganic Chemicals are compounds that do not contain hydrocarbon groups.
Organic Chemicals are compounds containing hydrocarbon groups.
Chemicals are used to make a wide variety of consumer goods, as well as thousands inputs to agriculture, manufacturing, construction, and service industries.