Summary:

The NIST Chemistry WebBook provides "...users with easy access to chemical and physical property data for chemical species through the Internet. [The site] is organized by chemical species...." The site offers "...thermochemical, thermophysical, and ion energetics data compiled by NIST [National Institute of Standards and Technology] under the Standard Reference Data Program."

Upon accessing the site, the user will find an area devoted to information on the data's contributors. Below this area, the site's main page features search options and fields. Regardless of the major option selected, the site displays a uniform query page, only slightly altered to reflect this search option. Noted fields within the query page are: (1) a field to enter the major selected option; (2) a desired units field, either SI or calorie-based; (3) data selection fields, offering thermodynamic options and other data options; and (4) an area of searching information. Within the site's main page, users can select from these major search options: (1) formula;(2) name; (3) partial formula; (4) CAS registry number; (5) molecular weight; (6) ionization energy (IE); and (7) proton affinity.

Searching results produce an extended entry, offering: (1) chemical name; (2) formula; (3) molecular weight; (4) CAS registry number; (5) chemical structure; (6) other names for chemical; (7) gas phase thermochemistry data; (8) references; (9) notes/error report; (10) other data, including -- phase change data, reaction thermodynamic data, gas phase ion energetics data, and a switch to calorie-based units. For those topics noted as numbers seven through ten, the site offers multiple links for further information. Users should scroll to view the matching chemical results entry.

Also featured within the site's main page are documentation links: (1) FAQ; (2) site version history; (3) guide to the site; (4) explanation of gas-phase ion thermochemistry; and (5) citation guide for the site. The bottom of the site's main page offers links to the NIST hompage and NIST online databases. The site is sponsored by the National Institute of Standards and Technology (NIST), Gaithersburg, Maryland.

To Search:

Select major search option from main page and fill out fields in displayed query page. Scroll to view chemical entry; links provided for further information for some subtopics.