Chemistry

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A web resource that contains CAS Registry Numbers for approximately 7,900 chemicals of widespread general public interest. The CAS Registry Number is the universally recognized unique identifier of chemical substances and is often found on packaging and on articles of commerce.

The CAS Source Index (CASSI) Search Tool is an online resource intended to support researchers and librarians who need accurate bibliographic information. Use this complimentary tool to quickly identify or confirm journal titles and abbreviations for publications indexed by CAS since 1907, including serial and non-serial scientific and technical publications.

Save time and effort. Locate the bibliographic details you need quickly and easily. Search by Title, Abbreviation, CODEN, ISBN, or ISSN. Note that there is a limit of 100 answers per search, so it is recommended that you make your search as specific as possible.

A free chemical structure database providing fast text and structure search access to over 26 million structures from hundreds of data sources.

PubChem is an open chemistry database at the National Institutes of Health (NIH). “Open” means that you can put your scientific data in PubChem and that others may use it.
We collect information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety, toxicity data, and many others.
Since the launch in 2004, PubChem has become a key chemical information resource for scientists, students, and the general public. Each month our website and programmatic services provide data to several million users worldwide.

The Web Toolbox features helpful online science research tools and resources for
Analytical Chemistry, Life Science, Chemical Synthesis and Materials Science.

Wolfram Alpha is a computational knowledge engine or answer engine developed by Wolfram Alpha LLC, a subsidiary of Wolfram Research. It is an online service that answers factual queries directly by computing the answer from externally sourced "curated data", rather than providing a list of documents or web pages that might contain the answer as a search engine might. (Wikipedia)