There are many handbooks, dictionaries, and encyclopedias that describe chemical terms, structures, data, etc. If you are not clear about your topic, try establishing its limits with a good definition and some introductory information.
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AccessScience
Covers all of science; much information related to chemistry. Includes a scientific dictionary, images, and biographies of famous scientists. Also includes links to related websites.
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CRC Handbook of Chemistry & Physics
Key reference source for chemical and physical data--constants, properties, etc.
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Dictionary of Chemistry
Contains entries for over 4200 terms related to chemistry.
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Encyclopedia of Life Science
A comprehensive life sciences resource on a variety of topics from biochemistry to virology. Links to relevant news/articles. Also includes illustrations, a glossary, and related web resources, as well as themed collections of articles.
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Kirk-Othmer Encyclopedia of Chemical Technology
Comprehensive encyclopedia covering chemical technology, industrial processes and applications.