Chemistry Dictionary! Many important definitions in one handy spot.
Electron configuration help
PhET Simulations
Periodic Table of Videos
Tour of the Periodic Table Video
Interactive Periodic Table
Periodic Table of Uses
Science Geek
Amazing YouTubers:
*Paul Anderson for Honors/CP Classes (launches first video, playlist is on the right)
*Tyler DeWitt
Stated Clearly Chemistry Videos
*CrashCourse with Hank Green