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 Compounds
  • Chemical Processes and Tests

Nitrogen, a chemical element that forms compounds that are essential to life. Free nitrogen (nitrogen not combined with other elements) is a gas at ordinary temperatures and pressures, with no taste, odor, or color.

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