Quiz4Rubric

# Quiz4Rubric - Quiz 4 Rubric 7A-A/B Winter 2011 Quiz...

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Quiz 4 Rubric 7A-A/B Winter 2011 Quiz 4A (Pink) ------------------- Problem 1 (50% of quiz) a) (15%) Q (10): 6 R (8): close to 6 (miscounting) Z (0): wrong. b) (10%) Q (10): 6N/2 R (8.5): 6N or 12N S (6.7): something positively related to the 6 and N T (4): Miss all the above Z (0): effectively blank c) (10%) Q (10): Eb = (6 )(Na/2) (-1.7 ´ 10^-21 J ) » - 3500 J R (9.2): off in PE reading, minor error in calculation and units. S (7.8): sign error, miss the ½ , but still includes the main factors -- 6, N, and the well depth. T (6.5): miss main factors, but still use PE to argue. U (4): miss all the above Z (0): effectively blank d) (15%) Q (10): (1) The second system has fewer nearest neighbors per atom (2) The two systems have the same N (3) The two systems have the same well depth Therefore, the second system has a less negative Eb, and takes less energy to vaporize. R (8.8): Without explicit mentioning all the three points, clearly says that the second system has fewer NEAREST neighbor pairs to break. S (7): Clearly mention the well depths and numbers of bonds in making comparison, but in the wrong way. T (5.5):

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## This note was uploaded on 03/27/2011 for the course PHY 7A taught by Professor Pardini during the Winter '08 term at UC Davis.

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Quiz4Rubric - Quiz 4 Rubric 7A-A/B Winter 2011 Quiz...

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