Physical changes happen when you do/mix something that can be reversed. Best example is ripping a paper, you can just tape it back together so it is just an observable thing that changes, which is a physical change. Chemical changes happen when you mix things and they make a new substance and can’t be reversed. The best example of this is the Statue of Liberty, which changed in color due to the chemical change between the oxygen and copper, which created a new substance (rust) which made it green instead of copper.
Sorry for the long answer but hope this helps!
Explanation:
oh shi sorry I wish I could help but I'm stupid
Answer: A new model of the atom that described electrons as being in a cloud
Explanation:
Combustion=heat and light
decomposition=taking something away
single means one element changes
and double means two elements change l.
