try to see this site
Connexions :a place to view and share educational material made of small knowledge chunks called modules that can be organized as courses, books, reports, etc. Anyone may view or contribute:
http://cnx.org/
Concept Development Studies in Chemistry
http://cnx.org/content/col10264/latest/
collected learning materials
http://cnx.org/content/m14798/latest/
Connexions :a place to view and share educational material made of small knowledge chunks called modules that can be organized as courses, books, reports, etc. Anyone may view or contribute:
http://cnx.org/
Concept Development Studies in Chemistry
http://cnx.org/content/col10264/latest/
collected learning materials
http://cnx.org/content/m14798/latest/