Download 112 Ex II Spring 2013

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page 1
Chemistry 112
Spring 2013
Name__________________________________
CLS
EXAM II
__________________________________________________________________
100 points Show all your work. There are 8 pages to this exam (including reference)
(16 pts) 1] USING VSEPR, Draw and name the molecular shape and predict the bond angles for the following:
MOLECULAR SHAPE - Drawing + Bond Angle
(Drawing - include all electron dots!) Be careful in your
drawing!
XeBr2F2
SI2
IF4+1
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NAME OF
MOLECULAR
GEOMETRY
Use correct spelling
MOLECULAR SHAPE - Drawing + Bond Angle
(Drawing - include all electron dots!) Be careful in your
drawing!
NAME OF
MOLECULAR
GEOMETRY
Use correct spelling
HSO3 -1
(An oxy acid!)
(12 pts) 2]
a) Draw all the resonance structures for NClOS
Given:
b) Assign formal charges
c) Indicate the resonance structure is the most important
and explain why.
page 3
Cl
O
N
S
(56 pts) 3] Use the Valence Bond Theory to explain the bonding in the following molecules:
a.
BrI2 1-
Electron box diagrams/ Energy diagrams
b.
NO2
Electron box diagrams/ Energy diagrams
page 4
c. CH2S
Electron box diagrams/ Energy diagrams
(3) Contour Diagram - Label all the orbitals (s, p, sp2, for example), bond types (
or
), VSEPR name and bond angles
page 5
d.
XeCl2I2
Electron box diagrams/ Energy diagrams
(3) Contour Diagram Label all the orbitals (s, p, sp2, for example), bond types (
or
), and bond angles
page 6
e.
HCP
(1) The hybrid orbitals
(2) Electron box diagrams/ Energy diagrams
page 7
(22 points) 4 ] a. Draw the Molecular Orbital Energy level diagram for
F21-
Label all energy levels (atomic and molecular) – small 2p-2s interaction
b.
(1) Give the electronic configuration for
F21-starting with (1s)
(2)
Give the bond order
(3)
What are the magnetic properities of
(4)
Use the above MO diagram to determine which has the highest Bond energy
F21-or
F2 +1 Explain why.
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F21- ?