chm2045 exam 2 fall07 key

chm2045 exam 2 fall07 key - CHM 2045 Exam 2(Form Code A...

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CHM 2045 Exam 2 (Form Code A) October 18, 2007 Instructions: On your scantron sheet enter your name, UF ID number (start on the first space and leave the last space blank), Discussion Section No. and Form Code (see above). This exam consists of 25 multiple choice questions each worth 10.0 points for a total maximum of 250 pts. Keep your exam sheet (mark your answers on it and the scantron sheet). Turn in only the scantron. Any bubbling error will count as an incorrect response . Possibly Useful Info : (h = 6.626x10 -34 J·s) (c = 3.00 x 10 8 m/s) (R = 1.097 x 10 7 m -1 ) 1. The lowest frequency light that will produce the photoelectric effect is called the “threshold frequency”. The threshold frequency for platinum is 1.3x10 15 s -1 . What is the energy of a photon of this radiation? (1) 8.6x10 -19 J (2) 1.96x10 48 J (3) 5.1x10 -49 J (4) 8.6x10 19 J (5) 2.3x10 -7 J 2. If energy is absorbed by an H atom in its ground state, the atom is excited to a higher energy state. For example, the excitation of an electron from n = 1 to n = 3 requires radiation with a wavelength of 102.6 nm. Which of the following transitions would require radiation of longer wavelength than this? (a) n = 2 to n = 4 (b) n = 1 to n = 4 (c) n = 1 to n = 5 (d) n = 3 to n = 5 (1) (b) and (d) (2) (b) and (c) (3) (a) and (d) (4) (a) and (c) (5) (a) and (b) 3. A line in the Balmer series of the H atom has a wavelength of 486 nm and results from an electron transition from some upper level to the n = 2 level. The principal quantum number
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