The following Chemthink tutorials can now be found at Simbucket:

The Particulate Nature of Matter
Atomic Structure
Ionic Bonding
Covalent Bonding
Molecular Shapes

http://www.simbucket.com/welcome-to-simbucket/

 

Chemthink is currently not operational.

Chemthink's hosting provider has upgraded its database software and this has caused issues with the code that runs chemthink. I'm working on finding a solution but the code was written 10 years ago and may require a complete rewrite to make it work. If that is the case I will first work to make the site available without the database functionality.