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Entropy Changes for Phase Changes

Posted: Sun Feb 09, 2020 1:11 pm
by Rita Chen 1B
In Dr. Lavelle's lecture, he stated that phase changes have entropy changes. Can someone explain why?

Re: Entropy Changes for Phase Changes

Posted: Sun Feb 09, 2020 1:22 pm
by Naji Sarsam 1F
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.