11.11.2011 - Lecture 28 Chemistry 260 Lecture 28 November...

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Lecture 28 Chem 260 F11 1 Chemistry 260 Lecture 28 November 11, 2011 11/11/11 Phases. l Thermodynamics is a funny subject… z (Sommerfeld 1949) z Thermodynamics is a funny subject. The first time you go through it, you don't understand it at all. The second time you go through it, you think you understand it, except for one or two small points. The third time you go through it, you know you don't understand it, but by that time you are so used to it, it doesn't bother you anymore z (Sommerfeld (1949) on why he has not wrriten a book on thermodynamics. ) in April of 1951, while wri±ng a book on thermodynamics ( Thermodynamics and Sta1s1cal Mechanics ), and having been nominated 81 ±mes for the Nobel Prize (more than any other physicist), died in a car accident. His book was eventually published following his death as a collec±on of lectures. Another funny quote: l Reversible processes are not, in fact, processes at all, they are sequences of states of equilibrium. The processes which we encounter in real life are always irreversible . z Today in Chemistry 260 • Phase diagrams, phase changes Next Week in Chemistry 260 • MIDTERM TWO: Thu November 17 at 8-10 pm • reading: (Monday) Ch. 5 (A&D), (Friday) Ch. 6 (A&D) • mixtures (Monday) • ConcepTest-athon: connections lecture on Wednesday The Meaning of the Gibbs Energy Δ G of a reaction is the maximum non-expansion work at constant pressure and temperature, • Negative means work producing • Positive is work consuming G = H TS = (q-q rev (for const T,P) ) measure of the energy that can be obtained from the system as heat (H = U + PV) Energy stored in the random motions of molecules; energy stored in a disorderly way Difference (= G) becomes the net energy available to drive a chemical reaction forward (to do the work – an orderly transfer of energy - of a chemical reaction) Gibbs Energy is Dependent on T and P From G = H –TS v dG = dH -
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11.11.2011 - Lecture 28 Chemistry 260 Lecture 28 November...

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