Chem 251 Final Exam Worksheet - 2005
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9CHEM 251 (Fall-2005)
Final Exam (100 pts)
Name: ------------------------------------------------------------------------------, Student Clid # --------------------
LAST NAME, First
(Circle the alphabet segment of your LAST NAME): A-C
D-H
I-L
M-S
T-Z
Please answer the following questions:
Part I: Multiple Choices (30 pts: 10 @ 3 pts each). Circle the ONE best answer:
1. Consider the following two half reactions:
-
I
(aq) + 2 e
2 I
(aq)
E° = + 0.54 V
2
2+
Zn
(aq) + 2 e
Zn (s)
E° = - 0.44 V
Which of the above four species is the best oxidizing agent?
-
2+
a) I
b) I
c) Zn
d) Zn
2
2. The best explanation for the fact that nitrogen forms only NF
with fluorine while phosphorus
3
forms PF
, and PF
is that
3
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a) nitrogen is more electronegative than sulfur.
b) nitrogen is smaller than phosphorus.
c) phosphorus has d orbitals available for bonding
d) only nitrogen forms hydrogen bonds
3. Which of the following statements is false?
-
a) IF
possesses a distorted octahedral structure.
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b) HClO is a weak acid in aqueous solution.
c) ClO
is used to bleach flour and wood pulp and for water treatment.
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-
d) I
possesses an angular structure.
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4. Which of the following ions contribute greatly to the hardness of water?
-
2+
2+
3+
a) NO
b) Ca
c) Cu
d) Al
3
2-
5.
Consider the species Cl
SO, XeOF
and F
IO
, what is the hybridization of the central atom,
2
4
5
respectively?
2
3
3
2
3
3
2
3
3
a) sp
, sp
d, and sp
d
b) sp
d, sp
d
, sp
d
3
3
2
3
3
3
3
3
2
c) sp
, sp
d
, and sp
d
d) sp
, sp
d, and sp
d
6.
In the above problem, what is the molecular shape of the species, respectively?
a) trigonal planar, trigonal bipyramid, and octahedral
b) trigonal pyramid, trigonal bipyramid, and distorted octahedral
c) T-shaped, square pyramid, and octahedral.
d) trigonal pyramidal, square pyramid, and distorted octahedral.
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