In this chapter we learned about changes in matter such as physical and chemical changes. In a physical change the object is in a different form but can be changed back. In a chemical change the object completely changes form, it can not be changed back. We also did lots of fun experiments including mixing cabbage juice with baking soda ahd calcium chloride. It felt hot and cold at the same time, it was a chemical reaction. I have a question for you name one example of a chemical reaction?