12:45 Exam II Key; SPRING 2020 Dr. Williamson (note: the valence electrons on both for the salmon test was updated about 10:30pm on 3/5)

Green, Exam II, v1 Salmon, 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 (A= 3PTS) E 1 B
C A 2 C
E E 3 B
A B 4 A
A (D= 3PTS) D 5 C
A C 6 D
B A 7 C (B= 3PTS)
C E (A= 3PTS) 8 C
C D (B= 4 PTS) 9 D (E= 3PTS)
A B 10 E
A (C= 4 PTS) A 11 D
A A (B= 3PTS) 12 B (D= 4 PTS)
D E 13 C
B C 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 MC 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 2 pts if you did NOT bubble your name and UIN correctly)

For short answer, if you gave both the electronic and molecular geometry, BUT did not indicate which was the shape, then 1 pt for shape. The shape, hybridization, and polarity must match your drawing for credit on those. Answers are in the glass case in the hallway near 123 HELD.

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

shape of molecule
2pt

hybrid.
2pt		 Polar or nonpolar
2pt

Dissolve H2O or CCl4
2pt

Green XeF2 22 2 single bonds and 3 lone e- pairs on central atom --- linear sp3d nonpolar CCl4
Green NH2- 8 2 single bonds and 2 lone pair on central atom yes bent sp3 polar --
Salmon OCl2 20 2 single bond and 2 lone e- pair on central atom --- bent sp3 polar water
Salmon IF4- 36 4 single b. and 2 lone e- pair on central atom with a neg. charge yes square planar sp3d2 nonpolar --
Lavender SeO2 18 1 single bonds, 1 double bone, and 1 lone electron pair on central atom --- bent sp2 polar water
Lavender I3- 22 2 single bonds and 3 lone pairs on cental atom yes linear sp3d nonpolar --