classes%5Cwinter09%5C171ID38%5CFinalExamCHEM171w08

classes%5Cwinter09%5C171ID38%5CFinalExamCHEM171w08 -...

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Unformatted text preview: CHEM
171,
FINAL
EXAM,
MAR
17
07,
W’08,
YAGHI,
200
points
 NAME:
 
 Signature:
 NOTE:
The
exam
is
12
questions
on
8
pages
onto
which
you
should
provide
your
answers.
A
periodic
 table
of
the
elements
is
attached
on
page
9.
 1. (20
points)
Circle
the
molecules
that
are
Lewis
bases
and
justify
your
choice
in
one
short
 sentence.
 a. SO2

 
 
 b. B(OH)3
 
 
 c. ClO2‐
 
 
 d. SO32‐
 
 
 e. C5H5N
 
 2. (10
points)
a.
List
the
number
and
kind
of
faces
for
a
truncated
icosahedron.
 
 
 
 
 1
 
 
 
 
 
 
 
 
 
 
 
 TA:
 (10
points)
b.
Write
the
chemical
formula
for
a
structure
that
is
based
on
the
truncated
 icosahedron.
 
 
 3. (35
points)

Draw
a
plausible
Lewis‐type
structure
for
each
of
the
following
discrete
molecules
 and
ions:
 a. S3N3‐
 
 
 
 
 
 
 
 b. Te32‐
 
 
 
 
 
 c. S20
 
 
 
 
 
 2
 
 d. N2O3
 
 
 
 
 
 e. F2IO2‐
 
 
 
 
 
 f. 
 
 
 
 
 g. SiO44‐
 
 
 
 
 
 
 3
 
 ClO4‐
(chlorate)
 4. (20
points)
Draw
the
structures
of
two
C
allotropes
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 4
 
 5. (10
points)
Draw
a
possible
structure
for
Al4(OR)12
 
 
 
 
 
 
 
 
 
 
 6. (20
points)
What
do
you
expected
the
geometry
to
be
around
Pt
and
S
in
PtS?
Is
this
a
molecular
 or
extended
structure?

 
 
 
 
 
 
 
 
 
 
 
 
 5
 
 7. (10
points)
Suggest
a
structure
for
Cd(CN)2
 
 
 
 
 
 
 
 
 
 8. (20
points)
TiC
is
a
cubic
close
packed
structure
based
on
packing
of
C
anions.
How
many
 octahedral
holes
would
be
filled
if
all
Ti
cations
are
octahedral
and
how
many
of
the
tetrahedral
 holes
would
be
filled
if
all
Ti
cations
are
tetrahedral?
 
 
 
 
 
 9. (10
points)
What
are
the
important
symmetry
elements
and
point
group
for:
 a. 
 
 
 b. 
 
 6
 
 S 8
 1,3,5‐trichlorobenzene

 10. (10
points)
Determine
whether
the
metal
complex
K3Fe(CN)6
is
high
or
low
spin.
Why?
(Use
no
 more
than
one
sentence).
How
many
unpaired
electrons
does
the
Fe
complex
have?

 
 
 
 
 
 
 
 
 
 11. (10
points)
Circle
those
materials
that
you
expect
to
have
color:
 a. TiO2
 b. Si8O20(CH3)8
 c. Na3CoF6
 d. LiCl
 e. K4OsO4
 
 12. (20
points)
Circle
those
compounds
that
are
likely
to
exist.
For
those
that
you
don’t
believe
exist
 as
written
provide
a
reasonable
chemical
formula
by
altering
the
subscripts
only.
 a. [Cr(NH3)6](NO3)3
 
 b. Mo(CO)4
 
 c. HMn(CO)5
 
 7
 
 d. MgCl2.6H2O
 
 e. B2H3
 
 f. 
 g. (CN)2
 
 h. Mo12O4212‐
 
 i. 
 j. 
 
 
 
 
 P4O10
 KV(CO)6
 B O 2 ‐
 8
 
 
 9
 
 ...
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This note was uploaded on 01/29/2010 for the course CHEM 142725201 taught by Professor Kaner during the Fall '08 term at UCLA.

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