1. As always… OWL Lon-Capa assignments Lecture videos Textbook Read
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2. Clicker Question
The following chemical reaction is exothermic: A2 + B2  2AB. This means:
more stable higher average bond energies
a) Reactants Reactants
b) Reactants Products
c) Products Products
d) Products Reactants
e) I do not know.

3. Clicker Question
Consider the process: H2O(g)  H2O(l). Are Ssurr and S thermodynamically favorable or unfavorable?
Ssurr S
a) favorable favorable
b) favorable unfavorable
c) unfavorable favorable
d) unfavorable unfavorable
e) I do not know.

4. A Question to Consider
You have your freezer set at ‒15C. You open the freezer, grab some ice, and place it on your kitchen counter (your house thermostat is set at 25C). You get distracted and let the ice sit on the counter all day.
What happens to the ice?
How can you use thermodynamic principles to prove this will happen?

5. A Question to Consider
Calculate Suniv when you take 1 mole of ice at ‒15C. and let it sit in a room at 25C, 1 atm.
Hfusion for ice is 6.02 kJ/mol at 0C, 1 atm
Cp for water is 75.3 J/Kmol
Cp for ice is 37.5 J/Kmol
Assume Cp is constant over the temperature range in question.