Posted by richardm on 30th October 2009
We talked a bit more about ideal binary phase diagrams and the associated cooling curves. We then discussed the case of chemical interactions through the use of activity and the activity coefficient. Finally we started a discussion of a model on non-ideality, the regular solution model.
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Posted by richardm on 30th October 2009
Our second exam will be a take-home exam. I will distribute the exam on Monday, November 2 and it must be returned in person at the beginning of class on Monday, November 9.
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Posted by richardm on 28th October 2009
We saw how we can construct an ideal binary phase diagram (lens diagram) from our expression for the free energy of mixing of two ideal components. Our next step is to see what information this type of diagram gives us.
Solutions to Homework #7 have been posted, as well as last year’s Exam 2.
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Posted by richardm on 26th October 2009
We developed the beginnings of an ideal binary phase diagram for a two component system that can exist in the solid and liquid phase.
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Posted by richardm on 23rd October 2009
We explored homogeneous and heterogeneous nucleation of a solid from a liquid phase.
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Posted by richardm on 21st October 2009
We completed two of three practice problems and then began to explore phase transitions in a qualitative manner.
A new homework was also distributed.
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Posted by richardm on 19th October 2009
We derived the Clapeyron Equation to describe the coexistence curve for a single component system. This required a few assumptions which led us to the Clausius-Clapeyron Equation for the equilibrium between a condensed, pure phase and the vapor phase.
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Posted by richardm on 19th October 2009
After finishing up the practice problems from last time, we took a look at phase equilibria in single component systems. This led to the construction of our first (of many) phase diagrams.
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Posted by richardm on 14th October 2009
We looked at equilibria involving condensed phases and then began work on some practice problems. We will finish those up on Friday. Homework #6 was distributed.
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Posted by richardm on 12th October 2009
We derived the van’t Hoff Equation for the temperature dependence of the equilibrium constant. We also saw how to write the equilibrium constant in terms of mole fractions and completed one example.
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