page 1 Chem142 – Introduction to Physical Chemistry Exam #4 (50 minutes) Name ______________________ 100 points May 8, 2017 Units and ConstantsR = 8.314 J/K*mol = 0.08314 L*bar/K*mol = 0.08206 L*atm/K*mol NA= 6.022 * 1023mol-1kB= 1.38 * 10-23J/K h = 6.626 * 10-34J*s c = 3.00 * 108 m/s Ry = 2.180 * 10-18J electron mass = 9.109 * 10-31kg 1 dm3= 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 Equations1/21/2422ln222ln24hEtRTcMRTcMhE 2201212max1812122112JnBEBJ JhBIcIrkcEnm mmmk TJBch()6222*10INImNNlocalooh mEhEBBB212JJEB JEBJ1 _______/22 2 _______/10 3 _______/14 4 _______/27 5 _______/27 total _______/100
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.