Exam2A - CHEM
1211K
 Exam
Two
 Spring
2011


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Unformatted text preview: CHEM
1211K
 Exam
Two
 Spring
2011
 1.
What
is
the
best
ground
state
electron
configuration
for
Cu?
 
 
 A)
[Ar]3s23d9
 
 B)
[Ar]3s24d9
 
 C)
[Ar]3s13d10
 
 D)
[Ar]4s13d10
 
 E)
[Ar]4s23d9

 
 2.

How
many
unpaired
electrons
are
in
the
electron
configuration
for
Ge?
 
 
 A)
0
 
 B)
1
 
 C)
2
 
 D)
4
 
 E)
3
 
 3.

Which
theory
best
explains
the
polarity
of
a
molecule?
 
 
 A)
Lewis
theory
 
 B)
VSEPR
 
 C)
Valence
bond
theory
 
 D)
Electronegativity
 
 E)
Electron
affinity
 
 4.

Which
statement
correctly
identifies
whether
NO2+
or
NO2‐
has
the
greater

 O—N—O
bond
angle
and
accurately
explains
why?
 
 
 A)
NO2+
has
the
greater
bond
angle
because
there
are
only
two
areas
of

 
 




electron
density
around
the
central
atom.
 
 B)
NO2+
has
the
greater
bond
angle
because
the
positive
charge
on
the
ion

 
 
 




pulls
the
electron
pair
closer
to
the
central
atom,
increasing
the
bond

 
 
 




angle.
 
 C)
The
two
molecules
have
the
same
bond
angle.
 
 D)
NO2‐
has
the
greater
bond
angle
because
there
are
only
two
bonds,
making
 
 





the
molecule
linear.
 
 E)
NO2‐
has
the
greater
bond
angle
because
the
lone
pair
on
the
central
atom


 
 
 




increases
the
bond
angle.
 
 
 
 
 
 
 1
 CHEM
1211K
 Exam
Two
 Spring
2011
 5.

What
is
the
best
electron
configuration
for
Ni4+
?
 
 
 A)
[Ar]4s2d4
 
 B)
[Ar]3d6
 
 C)
[Ar]4s2d6
 
 D)
[Ar]4s23d104p2
 
 E)
[Ar]4s03d104p4
 
 6.

Which
best
describes
the
number
and
type
of
bonds
in
SiO2?
 
 
 A)
1
Si
to
O
single
bond
and
1
Si
to
O
double
bond
 
 B)
1
O
to
O
double
bond
and
1
Si
to
O
single
bond
 
 C)
1
O
to
O
single
bond
and
1
Si
to
O
double
bond
 
 D)
2
Si
to
O
double
bonds
 
 E)
1
Si
to
O
triple
bond
and
1
Si
to
O
single
bond
 
 
 7.

What
is
the
electron
group
arrangement
around
the
central
atom
in
SF4?
 
 
 A)
linear
 
 B)
trigonal
planar
 
 C)
tetrahedral
 
 D)
trigonal
bipyramidal
 
 E)
octahedral
 
 
 
 8.

What
is
the
formal
charge
the
O
atom
in
the
following
structure?
 
 
 
 
 
 
 
 
 
 
 
 A)
0
 B)
‐1
 C)
‐2
 D)
+1
 E)
+2
 
 2
 CHEM
1211K
 Exam
Two
 Spring
2011
 
 9.

The
following
Lewis
structure
was
drawn
for
a
Period
3
element.

Identify
the
 element.
 
 
 
 A)
Se
 
 B)
S
 
 C)
Br
 
 D)
Cl
 
 E)
Si
 
 
 10.

Which
resonance
structure
is
the
greatest
contributor
to
the
resonance
hybrid?

 
 
 
 
 
 
 
 3
 CHEM
1211K
 Exam
Two
 Spring
2011
 11.

Which
bond
is
most
polar?
 
 
 A)
C—C

 
 B)
C—H
 
 C)
C—O
 
 D)
C—F
 
 E)
C—Br
 
 12.

For
which
molecule
is
the
electron
group
arrangement
the
same
as
the
shape?
 
 
 A)
NF3
 
 B)
H2S
 
 C)
I3‐
 
 D)
SeBr4
 
 E)
HCN
 
 
 13.

Which
of
these
molecules
is
nonpolar?
 
 
 A)
PH3
 
 B)
BH3
 
 C)
SiCl2F2
 
 D)
XeF5+
 
 E)
OCl2
 
 14.

Which
molecule
has
the
strongest
C
to
O
bond?
 
 
 A)
CO2
 
 B)
CO
 
 C)
CH3OH
 
 D)
CH3COOH
 E)
They
all
have
the
same
strength
 
 
 
 15.

Which
statement
regarding
sigma
and
pi
bonds
is
true?
 
 
 A)
All
sigma
bonds
are
composed
of
s
atomic
orbitals.
 
 B)
All
pi
bonds
contain
a
sigma
bond.
 
 C)
All
triple
bonds
contain
three
pi
bonds.
 
 D)
A
sigma
bond
can
be
composed
of
p
orbitals,
but
only
if
they
are
oriented

 

 
 




along
the
internuclear
axis.
 
 E)
All
statements
are
true.
 
 
 
 4
 CHEM
1211K
 Exam
Two
 Spring
2011
 
 16.

Which
of
these
compounds
does
not
exist
(use
Lewis
structures
to
answer
this
 question)?
 
 
 A)
C2H2
 
 B)
C2H4
 
 C)
C2H6
 
 D)
C2H8
 
 E)
All
of
these
can
exist.
 
 
 17. Which statement best explains why the ionization energy of O is less positive than that of N? A) N has fewer p electrons. B) N does not want to gain an electron because it already has a half-full p orbital. C) O is a smaller atom, so its valence electrons are less tightly held. D) O is farther to the right in the same row as N. E) The loss of an electron from O results in a more stable electron configuration whereas the loss of an electron from N results in a less stable electron configuration. 
 

 18.

Which
atom
or
ion
is
smallest?
 
 
 A)
F
–
 
 B)
Mg2+
 
 C)
Na
 
 D)
Al3+
 
 E)
Ga
 
 
 19.

What
is
the
molecular
structure
of
ClF3
and
why?
 
 A)
Trigonal
planar.
The
lone
pairs
in
ClF3
occupy
the
axial
positions.
 B)
Trigonal
bipyramidal.
The
lone
pairs
in
ClF3
occupy
the
equatorial
positions.
 C)
T‐shaped.
The
lone
pairs
in
ClF3
occupy
the
equatorial
positions.
 D)
T‐shaped.
The
lone
pairs
in
ClF3
occupy
the
axial
positions.
 E)
Trigonal
pyramidal.
The
lone
pair
in
ClF3
is
neither
axial
nor
equatorial.
 
 
 
 
 
 
 
 5
 CHEM
1211K
 Exam
Two
 Spring
2011
 20.
What
is
the
shape
of
SO42‐
?
 
 
 A)
tetrahedral
 
 B)
trigonal
planar
 
 C)
trigonal
bipyramidal
 
 D)
trigonal
pyramidal
 
 E)
T‐shaped
 
 
 21.

Which
form
of
the
exam
do
you
have?
(No
points)
 
 
 A)
 
 B)
 
 
 6
 ...
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This note was uploaded on 01/16/2012 for the course CHEM 1211 taught by Professor Ford during the Fall '09 term at Georgia Institute of Technology.

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