I learned that a compound molecule is two or more atoms put together.Then I learned that stuff you use everyday is an acid.Like soap.Then I learned that stomach acids are kinda dangerous.My favorite thing we did in science was the lab with the baking soda and calcium chloride.I liked it because when we put the stuff in the bag the bag started to inflate and the stuff turned purple because of the cabbage juice.I didn't like ripping the paper into smaller pieces because it was boring just ripping paper in small pieces.Now here is my question,how do you abreviate hydrogen and other ones?