Chemistry Screencasts is a collection of mini-lectures on various chemistry topics with pictures and sound by Mark Ott of Jackson (MI) Community College — an interesting example of online multimedia in chemistry education. You have a choice of first-semester and second-semester topics.
Michelle Francl of Bryn Mawr College has prepared an extensive set of blogs, webcasts and podcasts. Some of these support first- and second year courses, others are for a wider, non-technical audience. All are thoughtful and engaging examples of ways to make Chemistry more interesting, and of how non-traditional media can be incorporated into a course. Some of the more interesting collections include Culture of Chemistry: The Who, What, When, Where and Why of Chemistry, and Chemistry 104 Lecture summaries
UC Berkeley offers webcast/podcast archives of lectures in certain courses, including the first-semester course Chem1a.
Distance Education Clearinghouse website at the University of Wisconsin offers articles, bibliographies, conferences, distance education web links and many additional resources.
CMU on-line Chemistry course - as part of an "Open Learning Initiative", Carnegie Mellon University offers what appears to be a demonstration course on chemical stoichiometry that illustrates several innovative approaches, including a simulation-based Virtual Laboratory. The "open and free" version is available to anyone; an Academic Version is also available that can be used in connection with existing courses.
Online Chemistry & Lab Courses - Oregon State U. now offers "Ecourses" in General-, Organic-, and Inorganic Chemistry.
MIT Principles of Chemical Science - Fall 2008 - This MIT OpenCourseWare course provides an introduction to the chemistry of biological, inorganic, and organic molecules. The emphasis is on basic principles of atomic and molecular electronic structure, thermodynamics, acid-base and redox equilibria, chemical kinetics, and catalysis.
MIT Kitchen Chemistry course - This course, given in 2006 by Patricia Christie, was designed to be an experimental and hands-on approach to applied chemistry (as seen in cooking). The materials are available by download.
ChemWiki - This site (at UC-Davis) offers an Open Textbook environment for topics beyond General Chemistry, such as physical, inorganic, and analytical chemistry.
Alkali metals in water - Demonstrates the reactions of Li, Na, K, Rb and Cs with water - UTube ****
Explosive Chemical Reaction: Potassium metal and Bromine - UTube *
Bromine and alcohol - "Here's an example of what happens when you mix BROMINE and alcohol." ***
Chemistry Video Tutorials - A large collection of short YouTube videos on Chemistry topics by high school teacher Mark Rosengarten. (This link leads to a YouTube piece on voltaic cells; to see the complete list, click on "Accelerated/Enriched Chmistry" in the right-hand panel.)
Contemporary Chemistry Multimedia Project - This site has a large collection animations, some quite good. In its present state, navigation is a bit awkward, and I consider it more useful as a source of ideas and links than as something for students to go through on their own.
Food Science videos by Kirsten Sanford - "Sometimes the art of cooking isn’t an art at all, it’s all about science." a nice collection of short videos, many of chemical interest.
Frostbite Theater - a collection of science videos relating to liquid nitrogen and electrostatics produced by Jefferson Lab.
Glassware and Apparatus Videos - show students the best way to assemble glass jointware. A variety of different examples are provided, with variations that demonstrate some of the more complicated assemblies that are often used in inorganic synthesis. Includes reflux, vacuum distillation, various three-necked flasks setups. This is one component of the VIPEr project for inorganic chemistry education.
Molecular Movies - "A portal for cell and molecular animation" - these excellent videos include organic reaction mechanisms, solids and polymerizations.
Organic Chemistry Reaction Mechanisms and Stereochemistry - This rather crudely-constructed Web site from Massey U. (New Zealand) currently offers eight videos on such topics as nucleophilic and electrophilic substitutions, the aldo reactions and the Claisen reaction.
Organic Chemistry Music Video "Resistant to Base" - "An organic chemistry-themed music video parodying Robert Palmer's 1985 "Addicted to Love." *
Shakhashiri Video DVD - Contains 49 of Bassam Shakhashiri's well known chemical demonstration videos.
SciTalks - Chemistry-related video lectures (many of them Nobel lectures).
The Periodic Table of Videos - click on an element, and watch a two-minute video from U. of Nottingham that describes the element and its uses.
Thermite - applied to an old car, and to liquid nitrogen ****
"Water-as-fuel" - "Stan Meyer developed a water "splitter" that separates hydrogen from oxygen, and burns the hydrogen as fuel in an internal combustion engine." Sure!

