Memorize the Periodic Table
Electron Configuration Chart for the Elements: Look any of them up or figure them out!
Wann hast du Geburtstag? Time Expressions
FREE Printable Periodic Table Of Elements Notecards
a map of German states
MCAT prep: units of concentration for Solution Chemistry
Covalent vs ionic bonds
This must have been posted here a lot of times. It's undoubtedly useful. - Imgur