Answer:
physical change is when the physical appearance (shape) of the object changes and the shape can be undone.
- if you have a paper clip, you can bend its shape, and you are able to make it go back to its original form.
chemical change is when the object changes chemically and the change can not be undone.
- if you make a cake from scratch and you bake it, after it is made, you can't separate the cake back into just the milk, or just the eggs.