Chemical Data ChemBioFinder Wish you had looked up that last value in the CRC before you left school? You may be able to find it here. A database of chemical information (mainly physical and thermodynamic properties) searchable by name, formula, etc. Some structures are also included, but you need appropriate viewers. ChemExper Chemical Dictionary Searchable database of chemical compounds. Gives physical properties and structures as well as links to MSDS and manufacturers. From ChemExper, Switzerland. EMCI Chemical Reference Index Links to MSDS, EPA and other information sources on a very long list of chemicals. Material Safety Data Sheets An extensive list of sources on the WWW provided by Tracy Tipping at Kansas State University. Where to find MSDS on the Internet Yet one more (and last) source of sources for MSDS, provided by Interactive Learning Paradigms, Incorporated. International Critical Tables You have to be of a certain age to remember poring through these looking for some obscure datum. Here they are in a searchable, scanned version. Navigation is a bit awkward but possible. Hazardous chemical database From the Hardy Research Group at the University of Akron. Provides some minimal physical and solubility data on a large number of inorganic and organic compounds. Properties of Organic Compounds Searchable database providing melting and boiling points, refractive indicies, MassSpec peaks, etc. Smell Database for Organic Compounds Yes, you read that right! NIST Webbook of Data Although the government is always threatening to make this a for-fee site, right now it provides a wealth of spectroscopic data (MS, IR) on a large number of organic compounds. Also available are more mundane data like boiling points, etc. Spectra are JAVA-generated. Very slick! NIST Atomic Spectra Databases More NIST data. This section is for radiative transitions and energy levels in atoms and ions. NIST Elemental Data Index Atomic spectroscopic, X-ray and gamma ray, radiation dosimetry, nuclear physics (isotopes), and other data from a nice periodic table interface. Visualization of element spectra The title says it all. For the visually inclined, this is a nifty realization of the data in NIST (above) for the visible emission spectra of the elements (ALL of them). Clicking on a spectrum expands it and adds a wavelength scale. Emission spectra A small number of color photos of emission spectra of gases and some common elements; wavelength scale included. Spectra of gas discharges Includes quite a number of elements and expanded color spectra with wavelength scales. Spectra Online Searchable FTIR and Raman spectra by compound name, formula, etc. Requires sign-in, but is free. Integrated Spectrum Database Searchable and annotated 1HNMR and 13CNMR, MS and IR on many compounds. From the National Institute of Materials and Chemical Research in Tsukuba, Japan. A Guide to Inorganic Qualitative Analysis Extensive guide covering preliminaries, tests and reactions. From Rod Beavon, Westminster School, UK. Common laboratory tests Covers cations, anions, flame tests and some common gases. Chemistry Data Tables From thermodynamic properties to aqueous equilibrium constants and electrode potentials and a nice solubility grid, this section of Tom Stretton's site has a good selection of typical data for the high school student. Physical, chemical and thermodynamic data for chemistry students at the University of York. Table of Exact Masses and Isotopic Abundances From Isotopic Instrument Services. Periodic table of isotopes and their half-lives From the Ernest O. Lawrence National Laboratory Table of nuclides Arranged to show the typical "belt of stability" (albeit on many pages), this table gives stability and decay information on isotopes. Lund/LBNL Nuclear Data Search Joint site from Lawrence Berkeley National Laboratory and the Department of Physics at Lund University in Sweden. Isotope decay data and more. Selected tables of chemical data in the public domain from Oliver Seely at CSU, Dominguez Hills Acid-Base indicators Concentrations of common commerical acids and bases Buffer solution formulas Composition and physical properties of some alloys Synonyms of common chemicals Dissociation constants for common acids and bases Solubility Product constants Standard Reduction Potentials Solubility Products Constants Fairly extensive table from Eni Generalic, Split, Croatia. Complex ion formation constants A table from the 8th edition of Petrucci--from the Prentice-Hall website. For data on individual chemical elements, see the listings in the Elements section of this site.