## Chem 131C. Lec. 04. Thermodynamics and Chemical Dynamics. Entropy (English)

UCI Chem 131C Thermodynamics and Chemical Dynamics (Spring 2012)

Lec 04. Thermodynamics and Chemical Dynamics -- Entropy --

View the complete course: http://ocw.uci.edu/courses/chem_131c_thermodynamics_and_chemical_dynamics.html

Instructor: Reginald Penner, Ph.D.

License: Creative Commons BY-NC-SA

Terms of Use: http://ocw.uci.edu/info.

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Description: In Chemistry 131C, students will study how to calculate macroscopic chemical properties of systems. This course will build on the microscopic understanding (Chemical Physics) to reinforce and expand your understanding of the basic thermo-chemistry concepts from General Chemistry (Physical Chemistry.) We then go on to study how chemical reaction rates are measured and calculated from molecular properties. Topics covered include: Energy, entropy, and the thermodynamic potentials; Chemical equilibrium; and Chemical kinetics. This video is part of a 27-lecture undergraduate-level course titled "Thermodynamics and Chemical Dynamics" taught at UC Irvine by Professor Reginald M. Penner.

Thermodynamics and Chemical Dynamics (Chem 131C) is part of OpenChem: http://ocw.uci.edu/openchem/

Recorded on April 9, 2012.

Index of Topics:

00:05 - Intro Slide: Entropy

00:15 - Announcements

01:00 - Quiz I histogram

01:03 - What's in this Lecture?

01:17 - Six things we have learned about Statistical Mechanics

04:17 - Boltzman Distribution Law Diagram and Definition

04:21 - Things we Have Learned About Statistical Mechanics so Far

04:32 - The Boltzmann Distribution Law Formula (Diagram)

06:34 - Formula/Equation Diagram (the average internal energy of each of N molecules)

08:11 - Equation Diagram ("so q contains information about the averge internal energy of our system.")

09:13 - Diagram: (The NO molecule)

10:01 - Graph (b) the electronic contribution to the molar internal energy at 300K.

11:20 - Graph (b) - Evaluating formula

13:58 - (Does formula and solution make sense?)

15:37 - Chart (On p. 429 of your book, three types of ensembles are discussed as follows:)

16:24 - Chart: Microcanonical Ensembles

16:34 - About Microcanonical Ensembles

17:14 - Graph: Example: NO - it's obvious we're talking about one molecule here...

17:54 - Diagram: The Boltzmann Distribution Law in terms of the molecular partition function, q

18:14 - so q asks the question:

18:47 - Canonical Ensembles

19:38 - Well, consider just two molecules, call them a and b...

21:28 - this is the appropriate expression when the N units are distinguishable.

22:48 - Equations for two States (for two distinguishable units, we CAN tell the difference...)

24:35 - Chart: What if we had three molecules, a, b,c...

25:53 - Chart: Ensemble name| What's Constant | Its Partition Function

27:01 - Experiment: Place 100 nickels into a shoes box, all heads up

29:00 - Experiment: 1. Place 100 nickels into a shoes box, ALL heads up...

30:34 - Experiment Conclusion: "For any isolated assembly, we can always predict...

31:00 - For any isolated assembly...

31:55 - Formula: S = k In W

Required attribution: Penner, Reginald Thermodynamics and Chemical Dynamics 131C (UCI OpenCourseWare: University of California, Irvine), http://ocw.uci.edu/courses/chem_131c_thermodynamics_and_chemical_dynamics.html. [Access date]. License: Creative Commons Attribution-ShareAlike 3.0 United States License.

- Author:
- Reginald Penner
- Title:
- Chancellor's Professor
- Department:
- Chemistry

Chem 131C (Spring 2012): Entropy by Reginald Penner is licensed under a Creative Commons Attribution-ShareAlike Unported 3.0 License