Chemistry - Entropy Changes in Physical Processes

AI Thread Summary
Entropy changes in physical processes are crucial for understanding thermodynamics. In purification, entropy decreases as substances are refined into a single form. Mixing results in increased disorder, leading to an increase in entropy. Freezing decreases entropy due to the transition from a more disordered liquid state to a structured solid state. Evaporation increases entropy as a liquid transforms into a gas, while separation of substances also increases entropy by creating multiple distinct components. Understanding these changes is essential for accurately predicting system behavior in chemistry.
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Homework Statement


Indicate how entropy of the system changes for each of the physical processes shown below.
Entropy increases, entropy decreases, entropy does not change.

1. Purification
2. Mixing
3. Freezing
4. Evaporation
5. Separation


Homework Equations



Entropy increases when it goes from less to more disorder.
Entropy decreases when it goes from more to less disorder.

The Attempt at a Solution



Purification - many to one substance, so entropy decreases
Mixing - many to one substance, so entropy decreases
Freezing - more to less disorder, so entropy decreases
Evaporation - less to more disorder, so entropy increases
Separation - one to many substances, so entropy increases

These are wrong, but I can't think of why. Help is much appreciated.
 
Physics news on Phys.org
Mixing - many to one substance... Do you mean that solution is ONE SUBSTANCE? What do you mean by one substance?
 

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