1:50 Exam II Key; FALL 2017 Dr. Williamson (Note: the 1:50 key was changed about 3:30 on 10/23 for G #13, W #10, L #13)

Green, Exam II, v1 White, Exam II, v2QUESTION Lavender, Exam II, v3
5.5 pts each unless noted 5.5 pts each unless noted 5.5 pts each unless noted
B D 1 A (D=2.5 pts)
D C 2 D
A C (A=2.5 pts) 3 A (B=3.5 pts)
B A 4 B (D=2.5 pts)
B D (B=2.5 pts) 5 E
B C (A=3.5 pts) 6 A
D C 7 D
B (E=2.5 pts) B 8 D
D A 9 D
A C, B 10 C
B B 11 D
E (C=3.5 pts) E 12 E
B, C A 13 D, B
D (B=2.5 pts) A 14 C

(14 MC x 5.5 pts each) = 77 pts + short answer 23 pts = 100 pts on the total exam
To find your grade: (the number of multiple-choice questions you got totally correct x 5.5) + any partial points = the total multiple choice out of 77. Later you will add to this your short answer grade (deducting 1 pt if you did NOT bubble your name and UIN correctly)

See the total key posted in the glass case outside room 123 HELD. For short answer, if you gave both the electronic and molecular geometry, then 1pt for shape. The shape, hybridization, and polarity must match your drawing for credit on those three.

  Species val. e-
1pt
drawing
3pt
brackets & ion charge 1pt

shape of molecule
2pt

hybrid.
2pt
Polar or nonpolar
2pt

Dissolve
2pt

Green OCl2 20 2 single bonds and 2 lone electron pair on central atom --- bent sp3 polar water
Green IF4- 36 4 single b. and 2 lone e- pair on central atom with a neg. charge yes square planar sp3d2 nonpolar --
White BrCl5 42 5 single bonds and 1 lone e- pair on central atom --- square pyramid sp3d2 polar water
White NO2 - 18 1 single bond, 1 double bond, and 1 lone e- pair on central atom with a neg. charge. yes bent or angular sp2 polar --
Lavender SeO2 18 1 single bond, 1 double bond, and 1 lone e- pair on central atom OR 2 double bonds and 1 lone e- pair --- bent or angular sp2 polar water
Lavender I3- 22 2 single b and 3 lone e- pair on central atom with a neg. charge yes linear sp3d nonpolar --