This is a one day activity in which students have to collect their evidence and use it to determine if a chemical change or a physical change has occurred. We then put two big sticky papers on the wall and one is titled "chemical change" and the other "physical change." Then the kids pick one word that they "saw" happen and write it on one of the sticky notes. Example- bubbles- indicated a chemical change. You can then have kids discuss the difference between chemical and physical changes from the sticky notes.
I have this available in a google doc as well.