Chem 212
Quiz 1i
p.1
NAME__________________________________
Lewis Structures, VSEPR, Functional Groups (20 pts)
1.
(6 pts) Write a reasonable Lewis structure for the following molecules o r ions, showing lone
pairs and formal charges where necessary:
a. N2O, nitrous oxide (one of the nitrogen atoms is central!)
There are three different resonance structures; any one of them would be an acceptable answer
+
O
or
N
+
N
-
: :
: :
:
:
:
+
N
2-
N
:
or
:
O
O
:
:
+
N
:
N
:
b. SO3
:
O
-
: :
+
O
:
S
:
:O
2. (3 pts) Write the chemical formula for the structure below: ___C10H16O2____________
O
a
H3C
c
d
OH
b
3. (8 pts) For the structure above, give the geometry (linear, triangular planar, triangular
planar/bent, tetrahedral, tetrahedral/triangular pyramidal, tetrahedral/bent, trigonal bipyramidal,
square planar, or octahedral) and the approximate bond angles around each of the atoms indicated.
Geometry
Angle
a. _______tetrahedral__________________________
___~109.5_______
b. _______triangular planar_____________________
___~120_______
c. _______tetrahedral__________________________
___~109.5_______
d. _______triangular planar_____________________
___~120_______
4. (3 pts) Circle and identify three functional groups in the structure below:
O
ketone
OH
alkyne
o
1 alcohol