Like HowStuffWorks on Facebook!

Science | Physical Science | Chemistry

Chemistry is the science of matter and the changes it undergoes during chemical reactions. In this section, learn about everyday chemistry, from chlorine beach to helium, and even why chocolate turns gray.

Chemical Elements

Chemical Elements

Chemical elements are substances composed of only one type of atom and they cannot be broken down further. Chemical elements are the simplest forms of matter and each one is assigned a specific atomic number. Check out these articles on chemical elements. See more »

Chemical Compounds

Chemical Compounds

Chemical compounds are substances that form when two or more elements are joined together. Most of the atoms that form living organisms and the Earth's crust are in compound form. Check out these great articles on chemical compounds. See more »

Chemical Processes and Tests

Chemical Processes and Tests

Chemical processes and tests allow chemists to ascertain the properties of various substances. By utilizing chemical processes and tests, scientists can look at life on the atomic level. Click here to find some articles on chemical processes and tests. See more »