Chemistry

From the Royal Society of Chemistry, this table provides a visual interpretation of the Table of Elements.

Periodic table from Chemical & Engineering News that links to stories about each element.

Graphically highlights the various relationships among the elements.

Gas and condensed phase properties, reaction thermochemistry, ion properties, constants of diatomics, spectra.

Provides physical & chemical characteristics, structure, MSDS, IR spectra and more. Search by CAS registry number, molecular formula, chemical name, physical & chemical properties.

NIST database that includes essentially all reported kinetics results for thermal gas-phase chemical reactions.

Thermophysical properties database.

From the Thermodynamics Research Laboratory, University of Illinois at Chicago

Lists recommended databases, handbooks, and websites (data, definition, measurement) for physico-chemical and other material properties.

Melting points, boiling points, density, vapor pressure, or refractive index of chemicals supplied by Sigma, Aldrich, or Fluka.