Fall 07 Exam 1 Key

Fall 07 Exam 1 Key - CHM 2210 Section 4830 Fall 2007 Exam...

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CHM 2210 – Section 4830 Name_______________________________ Fall 2007 Exam 1A UFID_______________________________ 1. (6 points) Circle the strongest acid in each group below (2 points each; no partial credit [NPC]). Group 1 : (consider resonance) Group 2 : (consider electron withdrawing abilities) OH OH OH strongest weakest O OH F O OH F O OH F F strongest weakest Group 3 : (consider periodic trends) H 3 C OH 2 H 3 C NH 3 strongest weakest 2. (6 points) Two trends in boiling points are shown below. Indicate which intermolecular interaction best explains the trend. The possible choices are: dipole-dipole forces, London dispersion forces, and hydrogen bonding. (3 points each; NPC) Trend 1 : OH O H 2 O 100 o C 34.6 o C 78.4 o C Interaction: _Hydrogen bonding _ Trend 2 : butane octane dodecane Interaction: _London Dispersion _ -0.5°C 125.5°C 216.2°C
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3. (15 points) Draw resonance structure(s) for the molecules shown below. Circle the major contributor. If there are no major contributors, do not circle a structure. (5 points each; -1 each missing structure; -1 each incorrect structure; -1 incorrect major contributor; -1 missing charge; -5 nothing correct) NH O NH O NH O NH O O O O C O O no major
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Fall 07 Exam 1 Key - CHM 2210 Section 4830 Fall 2007 Exam...

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