Exam3Key - EXAM III Name: KEY CHEM 103a Fall Semester, 2007...

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Unformatted text preview: EXAM III Name: KEY CHEM 103a Fall Semester, 2007 Created by Dr. J. Pollard 100 points TWO VERSIONS OF EXAM: Look on the cover sheet - Periodic Table underlined = answers in red Periodic Table not underlined = answers in blue DO NOT REMOVE THIS PAGE /10 /35 /30 /20 /15 /5 /100 Periodic Table (2 7 7) *Lanthanides 58 Ce 140.1 59 Pr 140.9 60 Nd 144.2 61 Pm (145) 62 Sm 150.4 63 Eu 152.0 64 Gd 157.3 65 Tb 158.9 66 Dy 162.5 67 Ho 164.9 68 Er 167.3 69 Tm 168.9 70 Yb 173.0 71 Lu 175.0 1) (27, 3 each) For each of the following, draw the 2-D Lewis structure, label its molecular geometry and list whether the molecule is polar or non-polar. BF 3 B F F F Trigonal planar non-polar XeF 2 Xe F F Linear non-polar CH 2 O C H H O Trigonal planar polar SOCl 2 S O Cl Cl Trigonal pyramid polar BrCl 3 Br Cl Cl Cl T-shaped polar ClF 2 + Cl + F F Bent polar SO 2 S O O Bent polar H 2 O O H H Bent polar C 2 H 2 H C C H Linear non-polar 2) (2) What is the hybridization state of C in CH 2 O / C 2 H 2 ? sp 2 / sp 3) (2) What is the primary intermolecular force in pure SO 2 / C 2 H 2 ? dipole-dipole / dispersion 4) (4) Which would you predict to have a higher / lower boiling point, SO 2 or SeO 2 ? SeO 2 and SO 2 are both bent and polar, but Se is more polarizable than S. SeO 2 has the higher boiling point; SO 2 has the lower boiling point....
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Exam3Key - EXAM III Name: KEY CHEM 103a Fall Semester, 2007...

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