While you are doing it — using this program (click if you want it to open in a full-width window, not in Learn@UW) — read these tips (that hopefully are helpful), plus directions for how you should answer questions 2 and 4a:
• 10 points (or 20): As usual, to avoid heavy late-penalties, you must submit it before the deadline. It's due M (not W, as in Fall 2011) and I won't be able to remind you T or W, so put it on your list of things to do. I recommend giving it to me F, Nov 9, unless (when you see the lecture slides, when they are available) F's lecture will be relevant and useful. After the deadline, you WILL lose points, because Dr Larson has granted her TAs no "flexibility with honesty-and-integrity" for deducting the deadline-points.
• For #2, please read carefully and think logically. [a comment: In 2011, even with this warning and clear explanations in the directions (but be careful with your interpretation of "In contrast,...") many students still missed this, so I'll emphasize more strongly that — as with any problem dealing with a "double negative" kind of logic — you should read very carefully and think very logically.]
• For #3a, you should draw pictures of CO2 as drawn & described in CiC, pages 120-121, if you want full credit. These same drawings have been used in lectures, and on Exam 3 for Fall 2011. Look at the animated motions in the program, so you can build a "mental model" of what the pictures (Fig 3.16) look like during actual movements. There is a logical reason, which is explained in pages 120-121, for showing only one stretching mode. But instead of showing only one bending mode (you can see the C moving left-and-right) the program should also show the other bending mode, with the C moving up-and-down; you cannot see this up-and-down mode on the screen, but you can imagine it.
• For 4a, interpret the question as "What other greenhouse gases in the list are only human-made?" { In 4b, "what they want" is clear, but not in 4a. } You'll know some of these from lectures/CiC, and you'll know that some do have natural sources; but if you're in doubt about others you can google to discover if a molecule has one or more natural sources. Be careful about nitrous oxide, which is not the chemical that produces nitric acid in acid rain.
• 4b-4c: The important concept of "windows" is explained in 4b/4c, and it makes sense if you read-and-think about it carefully. / Here are two comments about the directions: When it defines windows as "where there are no absorptions" don't take the "no" literally because a window doesn't have to have zero absorption, since "almost zero" also qualifies as a window. (use common sense for this; on a test hopefully the window-regions will be clear, but you can ask questions) And there is a small typo-error: "regions where IR light is can escape" should be "regions where IR light can escape."
• 5: (no comment)