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

Chapter 9: Problem #122

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

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

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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.”

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?