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

2. If interested… My First Chemistry Exam Did Not Go Well, Now What?
Come join us for a discussion on how to improve your exam scores! We will chat about the differences between high school and college chemistry classes, study skills to develop moving forward, and time management.  
Thursday, October 11 4:00-5:20 PM, 1028 Lincoln Hall  

3. Clicker Question
What is the smallest number of ice cubes at 0°C, each containing one mole of water, necessary to cool g of liquid water initially at 20°C to 0°C at 1.00 atm? Assume for this problem that H and Cp are temperature independent.
ΔHf° = kJ/mol of H2O(l)
ΔHf° = kJ/mol of H2O(s)
Cp = 75.3 J/molK for H2O(l)
a) b) c) d) e) 126

4. OWL Question #1
In a coffee-cup calorimeter, 110.0 mL of 1.3 M  NaOH and mL of 1.3 M  HCl are mixed.
Both solutions were originally at 26.2°C. After the reaction, the final temperature is 34.9°C.
Assuming that all the solutions have a density of 1.0g/cm3 and a specific heat capacity of 4.18 J/°C·g, calculate the enthalpy change for the neutralization of HCl by NaOH.
Assume that no heat is lost to the surroundings or to the calorimeter.

5. Chapter 9: Problem #122

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

7. Signs of values Ideal gas expanding into a vacuum: E a) + b) — c) 0
d) I am not sure about this.

8. Signs of values Ideal gas expanding into a vacuum: H a) + b) — c) 0
d) I am not sure about this.

9. Signs of values Ideal gas expanding into a vacuum: w a) + b) — c) 0
d) I am not sure about this.

10. Signs of values Ideal gas expanding into a vacuum: q a) + b) — c) 0
d) I am not sure about this.

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

12. 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.”

13. 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?

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