Chemistry

American Chemical Society — requires registration; provides information for undergraduate and graduate students through the educator and students section; news and articles are available through the enthusiasts section

Chemistry portal with free membership to access journal articles, whitepapers, and the Alchemist newsletter. Contains links to other chemistry sites.

Born in the wake of elevated concern about environmental pollution, EPA was established on December 2, 1970 to ensure environmental protection.

International Union of Pure and Applied Chemistry — provides information on nomenclature and symbols; there are links to websites about chemical elements; a few online publications are also available

National Institute for Occupational Safety and Health (NIOSH), Pocket Guide to Chemical Hazards — this institute is part of the Centers for Disease Control and Prevention (CDC); presents key information and data for about 650 chemicals or substance groups

British site providing free access to articles from chemistry related journals, chemistry blogs, and the Chemsoc section which includes hot topics, chemistry timeline, and more.

Agency for Toxic Substances and Disease and Registry — this institute is a part of the Department of Health and Human Services; gives information on hazardous substances and public health

Chemfinder — provides synonyms, CAS numbers, and physical properties data for thousands of chemicals

The Visual Elements Periodic Table — gives information on each element, such as discovery, origin, and description

WebElements — a periodic table with extensive information about every element; information ranges from the history of the element to common compounds to physical properties