Top exam scores

Class,

Incidentally, I should have mentioned that the top score on the final was 174/200. In addition, there was at least one perfect answer submitted for every problem.

MSS

Final exam and course grades

Dear CHE110A,

We have finished grading your final. Your course grades have been determined and will be posted to the egrades system shortly.

Here are some statistics for you:

Final:
60% average
14% standard deviation

Course grade counts:
3 A+
3 A
3 A-
3 B+
9 B
5 B-
2 C+
5 C
3 C-
3 D+
1 D
3 F

I have posted plots of the grade distributions at:
www.engr.ucsb.edu/~shell/che110a/finalgrades.pdf

If you would like your graded exam back or want to discuss your grade, please stop by my office. I will be here most of the week, including all of this afternoon 2-5pm. We won't post solutions, but in correcting your finals, we have made an effort to indicate the correct strategy.

Lastly, as for the elective I did not take as an undergrad -- that was art history.

Good luck in your future studies!

Cheers,
MSS

Pre-Final

Hi Class,
If you're looking for me today, I'll be between my office and the office-hour room (3301).
-Avi

Odds and ends

Dear class,

Solutions to HW8 and 9 are posted on the course website. In addition, solutions to the problems worked in the review session last night are posted there. If you have not received your graded HW8, please see Avi (Engineering II 3218). Due to HW9's due date of last Friday, we probably won't be able to get these graded before the final exam, but you should be able to review these problems using the posted solutions.

In preparing for the final, keep in mind this general problem solving strategy:

1. Make diagrams and/or tables to organize problem information.
2. If a problem involves many steps, break it into individual processes.
   
3. To each step, apply the first and second laws, choosing the version (closed or open) as appropriate.
4. Identify any quantities that are constant or zero and use these to simplify the first and second laws.
5. Determine any quantities that you can solve immediately: Q, W, DH, DS, DU, etc.
6. Use substance-specific data to solve for the remaining quantities: charts, steam tables, PVT EOS, Cp models, generalized correlations, etc.

This strategy should carry you through almost any thermodynamics problem and will, at the least, earn you partial credit.

Good luck on the final! I've enjoyed teaching you all this quarter and hope you continue to stay in touch as you progress through the curriculum,

Cheers,
MSS

Review Session

Hi Class,
The problems for the review session have been posted.
-Avi

Review Session

Hi Class,
So as decided today in class, there will be a review session next Tuesday (March 17) between 7-9 pm in room 3301 (the usual classroom in which I hold office hours). In the first hour, I will solve a problem (which will be posted by next Monday). In the second hour, you can ask me anything you want - so come prepared :)
-Avi

HW9

Dear class-

Here are some clarifications / hints for HW9:

Problem 48: You will want to use the tabulated Pitzer correlations in the tables at the back of the book (which we reviewed in class), not the analytical virial coefficient equations (which we did not).

Problem 49: Think about which intensive property you can determine for the final state of the system, after one phase has disappeared. Recall that the book provides values for V, U, H, and S in the steam tables.

Problem 52: Notice that there are no tables for the properties of subcooled water. This is because liquid water at higher temperatures can be modeled to a reasonable degree with analytic equations. Therefore, for the pump part of this problem, you will have to use the equations presented in class for computing enthalpy changes in liquids in the isentropic and general cases. You might beware that there are some typos in eqns 7.25 and 7.26 in the book.

MSS