Originally Posted by solaris
Have you tried The Elements and Carbon Chemistry by Ellen McHenry?
http://www.ellenjmchenrydownloads.com/The-Elements_c19.htm
http://www.ellenjmchenrydownloads.com/Carbon-Chemistry_c20.htm

I hope this helps!
I did buy The Elements and we received it the other day. So far dd LOVES it! I do too.