PLEASE HELP
Freezing and melting are two different physical changes that involve the same amount of energy.
Compare and contrast the potential energy diagrams that would represent each of these processes. Be specific in your comparison.

Question

PLEASE HELP
Freezing and melting are two different physical changes that involve the same amount of energy. 
Compare and contrast the potential energy diagrams that would represent each of these processes. Be specific in your comparison.

aaronq · Answer

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$H_2O$ molecules are attracted to one another by electrostatic forces. In ice, the stronger attraction that results in closer/shorter bonds (though the overall density increase due to the highly ordered structure) than in liquid water so the potential energy is lower.