1. In class last time, we tried to "take a step back" and look at where we are now as if a narrator were giving us the "big picture" for a play we were watching. Here's your second chance to express a couple of thoughts about the difference between what we did when we looked at the Ideal Gas in Chapter 3 and what we are doing now as we look at the Ideal Gas again. Please write a couple of sentences in your own words to explain what we're now doing, and what this will lead us into.
Enter your answer here:
2. Consider the reversible isothermal expansion example given in the textbook (pp. 171-173): N = 1 x 1022 atoms of 4He, V1 = 103 cm3 = .001 m3; V2 = 2 x 103 cm3 = .002 m3, and T = 300 K.
The book indicates that the change in entropy when the volume is increased from V1 to V2 is given by 0.069 x 1023.
Is this a big change or a small change? (That is, does this change represent a big amount of the total entropy before the expansion?) To answer this question, calculate s1 (before the expansion) and s2 (after the expansion). State the values.
Also, what is F1, the Free Energy of the system before the expansion? Is F2 bigger or smaller? (Why?)
Hints: Remember that s = N[log(nQ/n) + 5/2], that you can actually calculate nQ for this system, and that F = U - t s.
3. The free energy F of an ideal gas system
Check the correct answer: a) increases with concentration and increases with temperature.b) increases with concentration and decreases with temperature.c) decreases with concentration and increases with temperature.d) decreases with concentration and decreases with temperature. Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.): You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.
I received no help from anyone on this assignment. I received help from someone on this assignment (document in comments section).