Chemistry/Biochemistry

A federal, non-regulatory, environmental public health agency overseen by the U.S. Department of Health and Human Services. ATSDR is the lead federal public health agency for determining, preventing, and mitigating the human health effects of exposure to hazardous substances.

Compound Interest takes a closer look at the chemical compounds we come across on a day-to-day basis, explaining them with easy-to-understand graphics.

The National Institute for Standards to Technology Chemistry WebBook provides users with easy access to chemical and physical property data for chemical species through the internet. The data provided in the site are from collections maintained by the NIST Standard Reference Data Program and outside contributors.

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.