Chemistry & Biochemistry

Directory of chemicals, physical properties, and Internet links. Sign up for free access.

The Chemical Thesaurus is a reaction chemistry information system that extends traditional references by providing hyperlinks between related information. The program goes a long way toward meeting its ambitious goal of creating a nonlinear reference for reaction information. With its built-in connections, organizing themes, and multiple ways to sort and view data, The Chemical Thesaurus is much greater than the sum of the data in its database.

ChemSpider is a free chemical structure database providing fast text and structure search access to over 26 million structures from hundreds of data sources.

The Green Chemistry Assistant is a web site and fully functional web application. The overall objective of the site is to help you analyze chemical processes that you are interested in in terms of Green Chemistry and related topics beyond the typical confines of this field.

This is an online guide to chemical nomenclature, terminology, symbols and units as well as terminology definitions from IUPAC recommendations.

The NIST Chemistry WebBook is a comprehensive source for chemical and physical property data for chemical compounds.