Organic chemicals are those that contain carbon atoms, often in combination with hydrogen, oxygen, nitrogen, sulfur or other elements. The antonyms of organic chemicals could refer to inorganic compounds, which do not contain carbon or hydrocarbons. Some examples of inorganic compounds include water, salts, acids, bases and metals. In contrast to organic chemicals, inorganic compounds often lack complexity and diversity in terms of molecular structure and properties. Inorganic substances are commonly found in nature and play essential roles in biological processes, geology, chemistry and various fields of industry. While organic and inorganic substances may differ in their properties, both are important for understanding the nature and behavior of matter.