When you enter in the experimental world of chemistry, you can forget some easy rules learned some years ago. It’s for that I have searched about a website which summarizes all about we need, or remember.
1. Measurement in science
5. Atomic structure
6. Periodic table
8. Acids and bases
Don’t have any doubt, click on the link you need, it’s the best choice to make when we want keep in mind our knowledges and applicate them in our own chemistry !!!