Entropy Changes for Phase Changes

Boltzmann Equation for Entropy:

Moderators: Chem_Mod, Chem_Admin

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

Entropy Changes for Phase Changes

Postby Rita Chen 1B » Sun Feb 09, 2020 1:11 pm

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

Postby Naji Sarsam 1F » Sun Feb 09, 2020 1:22 pm

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.


Return to “Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy”

Who is online

Users browsing this forum: No registered users and 3 guests