Propane is one kind of hydrocarbon. Here are four different ways chemists use to show a molecule of propane. In the colored molecule models, carbon is light gray and hydrogen is white.
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Windows to the Universe original artwork by Randy Russell.

Hydrocarbons

There is a group of chemicals called hydrocarbons. The molecules of hydrocarbons are made of hydrogen and carbon atoms.

Most kinds of fuel have hydrocarbons in them. Hydrocarbons store energy. Coal, oil, and natural gas all have hydrocarbons in them.

When we burn fuels with hydrocarbons, we make carbon dioxide (CO2) gas. The carbon dioxide goes into the air. Sometimes the burning makes carbon monoxide (CO), too.

Some hydrocarbons help make air pollution. Some of them are part of chemicals called Volatile Organic Compounds (VOCs). VOCs are some of the chemicals in smog.

Here are some of the hydrocarbons that you may have heard of: methane (CH4), butane (C4H10), propane (C3H8), benzene (C6H6), ethane (C2H6), and hexane (C6H14).

Last modified February 15, 2006 by Randy Russell.

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