Chemistry explores how substances react with each other, how they change, how certain forces connect molecules, and how molecules are made are all parts of chemistry. Stretch your imagination to envision molecules that cannot be seen—but can be proven to exist—and you become a chemist.

2 b, c  be prepared to discuss
3 a b be prepared to show results and discuss
4 do a, c or d.  We cover b in session.  Recommend a. waterproofing