How do changes in state involve exchanges of energy?

1 Answer
anor277
Mar 31, 2018

Well, look at the energy involved in a change of state....

Explanation:

"Liquid"+Deltararr"Gas"...and likewise "Gas"rarr "Liquid"+Delta

And thus "vaporization/boiling" is "ENDOTHERMIC", and "condensation" is "EXOTHERMIC"...and this may be rationalized in that the act of boiling requires that STRONG liquid-liquid bonds be broken.

On the other hand, the transition solid to liquid should be "ENDOTHERMIC" according to the energy transfer..as should liquid to gas...

"Solid"+Deltararr"Liquid"

"Liquid"+Deltararr"Gas"

What do predict with regard to the transition, solid to gas, i.e. "sublimation"?

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