I guess I won't be able to answer that question until I learn the material in class. I was reading ch 9 in my chemistry txt book so that I would be able to understand some of the stuff in it before we start the chapter. We are behind in class and we haven't started chapter 9 yet. We start it on Monday and have a test on chapter 7,8, and 9 next thursday. And then 4 days after that we have our final exam which is cumulative. I always have to read the chapters before the lecture b/c otherwise I have no idea what our teacher is talking about.