We understand that matter can undergo both physical and chemical changes. We understand the difference between physical and chemical changes.
The mystery potion is a chemical reaction because the mixtures have bonded.
The baking soda bombs are being made which is a chemical reaction. The baking soda and vinegar are bonding making pressure.
the baking soda bombs explode, releasing pressure. This is a chemical change because the bottle releases all the pressure and gas.
Cracking your skull open is an example of a physical change. Because your head has not changed it is physical.
Even if you hit your head on the mail box, your head is still your head. all your head hasent changed, its just all over the floor.,
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