Chemistry Textbook - requires login information
The Scale of the Universe - one of the coolest things I've ever seen.
How science works. It's not your grade-school "scientific method."

• Flinn Scientific MSDS list - we get most of our chemicals from here. The MSDS download as acrobat PDF files.
• The Physical and Theoretical Chemistry Laboratory at Oxford University - Chemical and Safety Info - MSDS links and safety info for chemicals commonly used in HS laboratories
• The Chemical Database at the University of Akron
• MSDS Database - choose from several; just type in the name of the chemical
• Merck Catalog Database: first look up the catalog number of the chemical, then type or paste the catalog number into the search engine to get the MSDS in PDF form
• Online NIOSH Pocket Guide to Chemical Hazards - this source does not have everythihng we work with, but it has many of them.
• SIRI MSDS database
• Chemexper.com
• MSDS sources 
• MSDS from Oxford University 
• Ohio State University MSDS list

• Triple Beam Balance tutorial from Ohaus - you need to add the estimated digit.
• Balance practice - this process does not take into account the estimated digit
• Reading a Graduated Cylinder - be sure to estimate one place past the exact measurement.
• Measuring Volume - again, add the final, estimated digit.

• Ptable - interactive, visual, very complete
• A printable, color periodic table - needs Acrobat to open; very complete
• The Comic Book Periodic Table
• Periodic Table 
• PeriodicTable.com 
• Periodic Table Song - Tom Lehrer version
• Periodic Table Song - Daniel Radcliffe version
• The Periodic Table of Rock - marginally entertaining.
• The Periodic Table of Videos - cool stuff about each element (humor)

• This is not our lab!
• Chemical Safety presentation

• Significant Figures Practice
• Scientific notation
  
• Practice Problems Online - type in your answer and get immediate feedback

• Complex Ions - The aim of this experiment is to teach you something of the aqueous chemistry of common metal ions belonging to the first transition series

• Elementary Particles - from the University of Oregon
• Origins of Atomic Lines - comprehensive and understandable description of the ODG who did the experiments
• Light and Energy - yes, this is from Wikipedia. It's good.
• Electromagnetic Spectrum - a series of 5 minute videos from NASA, explaining the electromagnetic spectrum.
• Absorption Spectra - Click an element on the periodic table to see its absorption spectrum
• Rutherford's Goild Foil Experiment, explained
• Grand Orbital Table - representations of the way orbitals would look if we could see them.

• Preso on balancing equations - tutorial
• Balancing Equations - interactive game

• How big is a mole? Calculations to verify.

• Molecular Modeling Activity - a 3D look at molecules
• Shapes of Molecules - using Chem 3D
• Making Molecular Models - using a kit
• Building an Icosahedron - using a paper template

• Oxygen - reactivity and bonding (humorous)
• Oxygen - Periodic Table Videos (humorous)
• Graham's Law - a tutorial

• Dissociation of Salt

• Radiation Dose Chart

• EPA - what substances are being discharged near you?
• Animal Testing - Companies that still do testing on animals
• Chemistry of Lots of Stuff - videos from NBC

• As if you didn't need something to mess with your mind.
• Do you get it?
• Jokes With Einstein