physical chem exam 4 - Chem142 – Introduction to Physical Chemistry Exam#4(50 minutes Name 100 points May 8 2017 Units and Constants R = 8.314 J/K*mol

physical chem exam 4 - Chem142 – Introduction to Physical...

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page 1 Chem142 – Introduction to Physical Chemistry Exam #4 (50 minutes) Name ______________________ 100 points May 8, 2017 Units and Constants R = 8.314 J/K*mol = 0.08314 L*bar/K*mol = 0.08206 L*atm/K*mol N A = 6.022 * 10 23 mol -1 k B = 1.38 * 10 -23 J/K h = 6.626 * 10 -34 J*s c = 3.00 * 10 8 m/s Ry = 2.180 * 10 -18 J electron mass = 9.109 * 10 -31 kg 1 dm 3 = 1 L K = 273.15 + °C 1 bar = 100 kPa = 0.986 atm 1 atm = 101.325 kPa = 760 torr 1 L*atm = 101.325 J Equations 1/2 1/2 4 2 2 ln2 2 2 ln2 4 h E t RT c M RT c M h E      2 2 0 1 2 1 2 max 1 8 1 2 1 2 2 1 1 2 J n B E BJ J h B Ic I r k c E n m m m m k T J Bch ( ) 6 2 2 2 *10 I N I m N N local o o h m E h E  B B B 2 1 2 J J E B J E BJ  1 _______/22 2 _______/10 3 _______/14 4 _______/27 5 _______/27 total _______/100
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page 2 #1. Short answer questions. (22 points total) a) (6 points) What type of light is required for each type of spectroscopy? Choose from among radio waves, microwaves, infrared, visible/ultraviolet, and x-rays. electronic ___visible/ultraviolet______ rotational ___microwaves__________ NMR ___radio waves_________ vibrational ___infrared__________ Order the types of light (radio waves, microwaves, infrared, visible/ultraviolet, and x-rays) from highest to lowest energy. (highest energy) (lowest energy) ______x-rays____ > ______visible/ultraviolet____ > ____infrared_____ > ______microwave_____ > ___radio wave_____ b) (6 points) Circle one choice in each of the following. An excited state with a short / long lifetime will give a peak with more lifetime broadening in a spectrum. A gas phase / liquid phase sample will give peaks with more pressure broadening in a spectrum. A gas phase / liquid phase sample will give peaks with more Doppler broadening in a spectrum. A gas phase sample at low / high temperature will give peaks with more Doppler broadening in a spectrum.
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