Hi its 75E again. Three thing i learned in this chapter were about physical changes and chemical changes. I also learmed about chemical reactions. A physical change is like when you cut a pice of wood. A physical change is when you change the state. A chemical change is when you burn a pice of toast you can not unburn it. A chemical reaction is when you have baking soda and cabage jucie together. I liked the chemical in a bag lab. I liked every thing about  this chapter. I still have questions about chemical reactions....