Use formal charges to explain why N2 is more stable than CO, even though they have the same number of atoms and valence electrons.

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.

Boiling is the right answer 

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