How do the resonance structures for ozone, O3, differ?
A. They have different numbers of atoms.
B. They have atoms in different positions,
C. They have different numbers of electrons.
D. They have electrons in different locations,

I believe it’s A because they would have different number if oxygen molecules

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

The formula is (nh4)2co3