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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. Literature citations are retrieved from PubMed.

Mutual solubilities and liquid-liquid equilibria of binary, ternary, and quaternary systems are presented.

Contains thermodynamic and spectral data for organic and inorganic compounds.

Provided by the National Institute of Standards and Technology. Use "Free Online Reference Data" link

Contains records for printed handbooks and compilations of thermochemical and thermophysical data for chemical compounds and other substances

An extensive online dictionary of chemical terms from all fields with many interactive features.