Web

http://www.webelements.com/

Chem

https://en.wikipedia.org/wiki/Chem

Guide
http://www.chemguide.co.uk/

Help
http://www.chemhelper.com/

Show
http://www.chemshow.com/

Chemical
http://www.chemicalelements.com/

Tube
https://www.youtube.com/results?search_query=Chem

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Chem