1. As always… Lon-Capa assignments Lecture videos Textbook Read
Do text homework
Video for Wednesday (10/18): Reversible Processes

2. Questions To Consider
How can we predict which reactions are spontaneous (and what do we mean by spontaneous)?
How can we provide support (mathematical and qualitative) for observations?
Ice cream melts
Coffee cools
Why do systems reach equilibrium? That is, why doesn’t the ball go all the way down the hill?

3. Clicker Question
Is the “pop bottle reaction” spontaneous or not spontaneous?
a) Spontaneous
b) Not spontaneous

4. How to Think About Entropy
Entropy is related to heat/temperature.
ΔS = qrev/T
Entropy as “disorder”.
S = k●logW

5. Temperature: measure of KEavg

6. From the videos and text…
…show how probability plays into all of this.
…show that thermal equilibrium is preferred when two bodies of different temperatures are put in contact with one another.
…see why entropy is related to the logarithm of the number of configurations or microstates.
…discuss what “reversible” means when we say the change is entropy equals qrev/T?

7. Clicker Question
How many different configurations are there for the most probable distribution when the stopcock is opened?
a) d) 20
b) e) 64
c) 15