a substance formed from two or more elements that are chemically combined in a fixed ratio

A class of organic compounds made of carbon, hydrogen, and oxygen that are a major source of energy for living things

organic compound; a general term for carbon-containing compounds (excluding simple ones like carbon monoxide and carbon dioxide)

Any organic compound consisting entirely of hydrogen and carbon, such as those found in petroleum and natural gas; also called [[烃|烴|ting1]].

The capacity of an atom or group of atoms to combine with others, measured by the number of hydrogen atoms it can displace or combine with; also called [[原子价|原子價|yuan2 zi3 jia4]].

Chemical compounds that generally do not contain carbon; also includes simple carbon-containing compounds like carbon dioxide

steroid compound

any of a class of chemical compounds, such as benzene, that contain one or more rings of atoms

chemical compounds consisting of a hydroxyl group bonded directly to an aromatic hydrocarbon group

A high-molecular-weight organic compound composed of repeating structural units, including natural examples like proteins and starch, or synthetic ones like plastics and rubber.

A chemical compound that can react as both an acid and a base

flavonoid (chemistry)

chemical compound containing two sulfur atoms per molecule

The state in which a chemical element exists as part of a compound; commonly found in chemically active metals in nature.

a large molecule or macromolecular compound composed of many repeated subunits

chemical compound consisting of carbon, chlorine, and fluorine, commonly used as refrigerants and aerosol propellants

carbamate; any of a class of organic compounds derived from carbamic acid

A general term for chemical compounds composed of nitrogen and oxygen, such as nitric oxide and nitrogen dioxide. These toxic pollutants contribute to smog, reduce visibility, and cause respiratory irritation.