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Chemistry - Entropy Changes in Physical Processes

  1. Mar 19, 2009 #1
    1. The problem statement, all variables and given/known data
    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

    2. Relevant equations

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

    3. 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.
  2. jcsd
  3. Mar 19, 2009 #2


    User Avatar

    Staff: Mentor

    Mixing - many to one substance... Do you mean that solution is ONE SUBSTANCE? What do you mean by one substance?
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