From: Yuehui Zhou (yuehuizhou$##$hotmail.com)
Date: Sat Mar 11 2000 - 16:08:09 EST
I don't think any basic chemical book has explained why crystallization
occurs. They just put it as a common knowledge.
I think the question deals with the entropy and the total energy of a
system. A mixture system is not a stable one, that means it tend to transfer
into a state with less energy. But that needs some energy to overcome the
certain energy barrier. Heating a solution gives this energy so that the
system can reorganize into the state with minimal energy....crystallization
occurs.
The terms I used here to describe the process may be not suitable, but well,
hope somebody can use more exact language to explain this.
The second question I don't understand.
The third question is actually similar to the first one. The interaction of
the molecules with same polarity is the strongest. That means the system
with such interactions tend to sink the energy to the minimal. If you don't
believe it, try to do multiplying three times among 2,2,3,3,4,4 and add
three productions together. The biggest result is the addition of
self-multiplying of three numbers. Any other combination will produce
smaller result. This makes the system the most stable one. And natural
process always goes to the direction that leads to the stable state.
Yuehui Zhou
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