Chemistry 11
Fall 2010
Solutions to Problems
Lewis Structures and VSEPR
1.
2.
SN = 4; tetrahedral
polar
4.
3.
SN = 2; linear
nonpolar
5.
SN = 4; tetrahedral
nonpolar
SN = 3; trigonal planar
nonpolar
:
:
Xe
:
6. F
F
SN = 5, 3 lone pairs; linear, nonpolar
C
O
:
7. H
H
SN = 3; trigonal planar, polar
8. H
P
H
H
SN = 4, 1 lone pair; trigonal pyramidal, polar
Se
:
9. F
F
SN = 4, 2 lone pairs; bent, polar
SN = 4, 2 lone pairs
bent, polar Chemistry 11
10. O
Fall 2010
C
O
—
O
O
C
O
O
—
O
C
O
—
O
Note there are 2 lone pairs on each double-bonded O atom and 3 lone pairs on each singlebonded O atom.
SN = 3; trigonal planar, nonpolar
11.
O
H
:
H—C—N—C—H
*
H
H—C—H
H
Specify the geometry at EACH ‘central’ atom (those bonded to more than 1 other atom):
C* : SN = 3; trigonal planar
Other C’s: SN = 4; tetrahedral
N: SN = 4, 1 lone pair; trigonal pyramidal
Polar molecule