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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