Hi, 58 M here. I wanted to tell you some things about this chapter.  First of all, I learned that  soultions can be made from solid, liquid or gas. Second, I learned that the air we breath is a solution, mostly made of nitrogen.  Third, I learned  that plants are effected by acid.  Acid level can even change their color.  My favorite thing about the chapter was the chemistry in a bag lab. This was my favorite because of our bag made a popping sound when we slowly opened it up. The thing I liked least about this chapter was the study guides because they are hard for me.  Finally, I always mixed up endothermic and exothermic.  How did you keep them straight?