<p>Perhaps try these?</p>
<p>[Chemistry</a> Virtual Textbook](<a href=“http://www.chem1.com/acad/webtext/virtualtextbook.html]Chemistry”>Chem1 Online Textbook Main Menu)
<a href=“http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Introduction-679.html[/url]”>http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Introduction-679.html</a>
[Chemistry</a> Online](<a href=“http://askthenerd.com/chemistryonline/TOC.html]Chemistry”>Chemistry Online)</p>