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4. Phase changes always have the same signs for AH and AS. What are the signs for AH and AS for these phase changes? a. vapo

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Answer #1

Melting: The process in which solid changes to liquid
Vapourisation: The process in which liquid changes to gas
Sublimation: The process in which solid changes to gas
In above 3 process, heat is absorbed.
So, delta H is positive.
Entropy is increasing.
So, delta S is positive.


Freezing: The process in which liquid changes to solid
Condensation: The process in which gas changes to liquid
deposition: The process in which gas changes to solid
In above 3 process, heat is released.
So, delta H is negative.
Entropy is decreasing.
So, delta S is negative.

Answer:
a) positive
b) negative
c) negative
d) positive
e) positive
f) negative

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