Chemistry

ChemSpider links together compound information across the web, providing free text and structure search access of millions of chemical structures.
ChemSpider mobile available at: http://cs.m.chemspider.com/

Share free info videos and other instruction about various chemistry topics.

Dept of Chemistry, U. of Kentucky

Provides information on the biological activities of small molecules. PubChem is organized as three linked databases within the NCBI's Entrez information retrieval system. These are PubChem Substance, PubChem Compound, and PubChem BioAssay.

Online resources for teaching and learning chemistry.

Videos related to chemistry concepts.

Wolfram|Alpha is an engine for computing answers and providing knowledge.
Wolfram|Alpha introduces a fundamentally new way to get knowledge and answers—
not by searching the web, but by doing dynamic computations based on a vast collection of built-in data, algorithms, and methods. Some free SOME FEE Based.