Constants and Conversions
Physical constants, SI units, and conversion factors
Structure and Properties
Data on mp, bp, specific gravity, vapor density, solubility, structure, etc.
of more than 60,000 compounds.
Mass spectral, NMR (proton and carbon), and infrared spectra (under construction)
of more than 10,000 compounds.
Primarily Infrared spectra. Search by CAS Number, name, and formula
Thermodynamic data, and infrared and mass spectra. Can search by name, formula,
molecular weight, registry number.
Toxicity/Safety Data Material Safety Data Sheets
180,000 MSDS records.
Contains links and info about many MSDS sites.
One of the most comprehensive periodic tables. Mirror sites at a number of institutions,
Reaction Constants (Ka, Ksp, etc)
Physical constants, atomic masses, thermodynamic properties, Ka for mono and
polyprotic acids, Ksp, Kf, reduction potentials.