1. As always… Lon-Capa assignments Lecture videos Textbook Read
Do text homework

2. Chapter 9: Problem #122

3. We know it should. But why?
Determine q, w
ΔE, ΔH for this
process.
Which helps us
to explain why
this happens?

4. Signs of values Ideal gas expanding into a vacuum: E H q w
b) — + + —
c) 0 0 — + d)
e) I am not sure about this/I didn’t get one of the above answers

5. Laws of Thermodynamics
First Law
The energy of the universe is constant.
Second Law
The entropy of the universe tends toward a maximum.

6. Laws of Thermodynamics
First Law
The quantity of energy is conserved.
“You cannot win, you can only break even.”
Second Law
The quality of energy is not conserved. It’s usefulness decreases.
“You cannot break even.”

7. 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?