Entropy Changes for Phase Changes

Boltzmann Equation for Entropy: $S = k_{B} \ln W$

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Rita Chen 1B
Posts: 112
Joined: Sat Jul 20, 2019 12:15 am

Entropy Changes for Phase Changes

In Dr. Lavelle's lecture, he stated that phase changes have entropy changes. Can someone explain why?

Naji Sarsam 1F
Posts: 104
Joined: Sat Aug 17, 2019 12:18 am

Re: Entropy Changes for Phase Changes

A phase change affects the entropy of a molecule because intermolecular bonds are either being broken or formed, which affect how ordered the system is. In cases where intermolecular bonds are being broken--melting and boiling--the entropy increases as atoms are freer to move and occupy more energy states. in cases where intermolecular bonds are being formed--freezing and condensation--the entropy decreases as atoms are less free to move and occupy less energy states.

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