MIdterm Ex. 2 - Spring'13-Answer Key(2) - Exam 2 Name...

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Exam 2 Name Karlin ANSWER KEY Introductory Chemistry 030.102.02 (Print) Last Name First Name Section 2 Prof. K.D. Karlin March 29, 2013 Student ID # (if you know it) __________ (14 problems, 100 points) SHOW ALL WORK FOR FULL/PARTIAL CREDIT Data attached: Periodic Table Some Information: R = 8.31 J/mole-K = 1.987 cal/mol-K Speed of light = 3.00 x 10 8 m/s 1 nm = 10 –9 m N Avagadro = 6.022 x 10 23 mole –1 Planck’s constant h = 6.63 x 10 –34 J•s m electron = 9.11 x 10 –31 kg 1 J = 1 kg m 2 /s 2 λ = h/p E n = – k [Z 2 /n 2 ] k = 2.18 x 10 –18 J { E n is the energy for the n th energy level of a one-electron system} 1. (8) Which of the following combinations of quantum numbers are allowed for an electron in a one-electron atom and which are not? Circle the correct answer. (a) n = 3, l = 2, m = 1, m s = 0 m s never 0 Allowed or Not Allowed (b) n = 2, l = 0, m = 0, m s = ½ Allowed 2s electron or Not Allowed (c) n = 7, l = 2, m = –2, m s = ½ Allowed or Not Allowed (d) n = 3, l = –3, m = –2, m s = ½ Allowed or Not Allowed l never negative
2 . (6) Is there a difference between stating "The electron is located at a particular point in space" and "There is a high probability that the electron is located at a particular point in space"? And, what Principle (name it) should be part of this discussion?
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