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Chemistry Subject Guide — Chemical Information

Chemical Identifiers

Substances can have multiple different names and formulae. To find all information about a substance, use the CAS Registry Number, a unique ID. However, remember that CAS RN's are not perfect--to be comprehensive, search by CAS RNs as well as substance names.

Look for a CAS Registry Number:

Chemical Terminology

IUPAC Compendium of Chemical Terminology (aka the 'Gold Book")


Chemical Safety

Toxicology Information


These are online tools for searching for chemical properties.

Chemical Data

Spectroscopy Databases