Includes 51 links covering many topics. Go to homepage. Click on chem is left column. Pick a topic. Cursor down to questions.
Answers follow immediately with explanations for incorrect answers.
Has additional problems for you to solve. Chem comics- periodic table you click on an element to see a cartoon or click on one of the cartoon characters. Science subjects including biology, chem, physics, earth science, computers, ecology and more. Check out the available resources at bottom of page for lessons, chats, mentoring, etc. Fun site where you can order things to learn science and math hands on.