This is a really cool article that shows the uses of activated carbon other than as a catalyst, and actually talks about biochemical breakdowns and Van Der Waals forces.
This site links to chemistry classroom management and activity resources. It also has a lot of fun links that relate chemistry to other subject areas from history to poetry.
This looks like a great website. It covers around twelve general chemistry topics and includes teacher resources, activities, videos, and labs for students.
This is an Amazing resource for modeling science topics with simulations! Run by the University of Colorado at Boulder, there are tons of interactive simulations including ones I've used in my classes that are very helpful in visualizing certain topics. The website also has shared activities from teachers across the country including lesson plans, homework, demos, and labs for all grade levels!
This website has a lot of fun easy science experiments. I found this website because my cooperating teacher uses it in her study hall classroom. The experiments relate to many different types of science. Most of them require minimal materials!
Talking Science is a great resource for Teachers Parents and Students. The Teachers section has activities and even lesson plans from all disciplines to use or draw ideas off of.
This site is maintained by a high school biology teacher. It includes notes / study guides, interactive quizzes, online activities, and numerous science links relating to all biology topics.