Winter 2007
February 1,2007
Chemistry 122
Exam 1
Oregon State University
Dr. Richard Nafshun
Instructions: You should have with you several number two pencils, an eraser, your 3" x 5" note card, a
calculator, and your University ID Card. If you have notes with you, place them in a sealed backpack
and place the backpack OUT OF SIGHT or place the notes directly on the table at the front of the room.
Fill in the front page of the Scantron answer sheet with your last name, first name, middle initial, and
student identification number. Leave the class section number and the test form number blank.
This exam consists of 25 multiple-choice questions. Each question has four points associated with it.
Select the best multiple-choice answer by filling in the corresponding circle on the rear page of the
answer sheet. If you have any questions before the exam, please ask. If you have any questions during
the exam, please ask the proctdr. Open and start this exam when instructed. When finished, place your
Scantron form in the appropriate stack and present your University ID Card to the proctor. You may
keep the exam packet, so please show your work and mark the answers you selected on it.
1
2
H
He
Hydmsn
Helium
1.0079
4.0026
1
4
5
6
7
8
9
10
Li
Be
B
C
N
0
F
Ne
Lilhium
Beryllium
Boron
Carbon
Nitrogen
Oxygcn
6.941
9.01218
10.81
12.01 1
14.0067
15.9994
18.9984
I1
12
13
Na
Mg
A1
Sodium
Magnesium
Aluminum
22.98977
24.305
26.9815
19.
20
21
22
23
24
25
V
Cr
Mn
Vanadium
Chromium
Manganese
50.9415
51.996
54.9380
n
28
29
'
38
39
40
41
42
Rb
Sr
Y
Zr
Nb
Mo
Rubidium
Strontium
Ymium
Zirconium
Niobium
85.4678
87.62
88.9059
91.22
92.9064
95.94
55
56
57-71
72
73
74
Cs
Ba
Hf
Ta
W
Hafnium
Tanfalum
l'ungsrcn
178.49
180.9479
183.85
IW
105
Ha
Cesium
Barium
132.9054
137.33
87
88
eanhs
89-103
Fr
Ra
Rf
Francium
Radium
'~ctinider Ruthcrfordiurn Hahniurn
(223)
226.0254
(261)
( 2 6 2 )
15
16
17
18
S
Cl
Ar
Silicon
Phosphorus
Sulfur
Chlorine
Argon
28.0855
30.97376
32.06
35.453
39.948
3I
32
33
34
35
36
Ga
Ge
As
Se
Br
Kr
Gallium
Germanium
Amnic
Selenium
Bmmine
Kryplon
78.96
79.904
83.80
72.59
74.9Z16
69.72
-
P
37
30
Neon
20.179
P
l4
Si.
.
Fluorine ,
43
44
45
46
47
48
49
50
51
52
53
54
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I.
Xe
Molybdenum Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Anomony
Tellurium
Iodine
Xenon
98.906
101.07
102.9055
106.4
107.868
112.41
114.82
118.69
121.75
127.M)
126.9045
131.30
75
76
77
78
79
80
81
82
83
84
85
86
0s
k
Pt
Au
Hg
:Tl
Pb
Bi
Po
At
Rn
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
186:ZOl
190.2
192.22
195.09
196.9665
200.59
204.37
207.2
208.9804
(209)
(210)
(222)'
106
107
108
Sg
Ns
'
Re'
Scaborgivm Neilsbohdum
(263)
(262)
Hs
Hassium
(265)
'
r
109
114
Mt
,Stable region?
MciVlcrium
(266)
(269)
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Lanthanium
Cerium
Samarium
Eumpium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutctium
138.9055
140.12
140.9077
144.24
145
150.4
151.%
157.25
158.9254
162.50
164.9304
167.26
168.9342
173.04
174.967
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
Actinium
Thorium
Pmfactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Caiifomium
Einsteinium
Fermium
227.0278
232.0381
231.0359
238.029
237.0482
(244)
(243)
(247)
(247)
(7.51)
(254)
(257)
Praseodymium Nwdymium Promelhiurn
Mendelevium Nobelium
(258)
259
Lamncium
262
Please read each exam question carefully. Terms such as correct,false, unpaired, pairs, H-C-F bond angle, H-C-H
angle, greatest, and smallest are used.
1.
There are
2.
The ground-state electron configuration of a sodium ion (Na') is:
3.
Consider Ba, As, F, Ge, and He. The atom with the largest atomic size is:
4.
Consider M ~ and
~ Mg.
+ Consider F-, and F. Which of the following statements is correct?
(D)
(E)
unpaired electrons in a ground-state oxide ion ( 0 ~ 3 .
l a g e r . t h m M g - a n d X J i ~
smaller than Mg and F- is larger than Fh]
smS1Ter than F.
M ~ is ~larger
+ than Mg and F- is smaller than F.
This question is ambiguous and cannot be answered without a data table.
5.
Ionization energy is:
(A)
(B)
(C)
(D)
(E)
6.
the energy required to push two electrons together
the energy required to form a Noble Gas from a Group 7 element
Consider an oxygen atom in the ground-state. Which of the following statements is false?
(A)
An oxygen atom has 8 total electrons; 2 are core electrons and 6 are valence electrons. T r u ~ (dots). Tr,&
(D)
(E)
There are two unpaired el
The oxygen atom is paramagnetic.
+.,
n_. f. r_
tb
aq
, ,
-
-
,.
.
&
,
.
$2
.
u&\c+%LL
. .a.E,i.~-i .,.:
.
l; r.-lilr..:.._...
Corc
c \
7.
The Lewis Dot Structure of COa depicts:
(A)
(B)
(c)
(D)
8.
2\ 5L
There are no lone pairs of electrons
There is one lone pair of electrons
There are two lone pairs of electrons
There are three lone pairs of electrons
e a r x u r lone pairs of electrons)
xygen bond order in the nitrate ion (NO3-)is:
Th
(A)
(B)
(C)
(D)
(E)
a
1.00
1.50
~ z , o o
3.00
L-
e-
+kc
s"-\\"
++ah
.!).
9.
k
.) proposes the Lewis Dot Structure below for C10i. Determine the formal
A student (
charges on each atom in this structure.
(A)
(B)
10.
The H-O-H bond angle in water, H20, is:
(A)
(B)
(C)
11.
The left oxygen has a formal charge of 0; the chlorine -1; and the right oxygen 0
The left oxygen has a formal charge of -1; the chlorine -1 ; and the right oxygen 0
chlorine - 1;and
180"
120"
109.5"
The molecular geometry of CF4 is:
(A)
(B)
(C)
(E)
bent
trigonal planar
tri onal yramidal
12.
13.
14.
The molecular geometry of NH3 is:
(A)
bent
(E)
octahedral
The H-C-H bond angle in monofluoromethane (CH3F)is:
(A)
(B)
90"
120"
(D)
(E)
A little greater than 109.5"
A itt e ess than 109.5"
The F-S-F bond angle in sulfur hexafluoride (SF6) is:
(a)
(b)
(c)
(d)
(e)
15.
a
120"
109.5"
A little greater than 109.5"
A little less than 109.5"
Consider 0, P, Al, Zn, and Fr. The atom with the greatest electronegativity is:
16.
Consider the following five molecules: NH3, 02, 0 3 , SF6,and COz.
How many of these are polar molecules?
(A)
(B)
(C)
(D)
(E)
One
@j3
Three
Four
Five
polar
F
17.
Consider ethene, C2H4. Ethene contains:
t4
H v
(D)
(E)
three n-bonds
four n-bonds
"/
H
18.
There are
(A)
0
3
'a-
C=C
er
\O0
t.\
resonance forms for the nitrate ion (NO3-).
"o~-QB\Q"
19.
Consider the molecule below and identify the correct statement.
(A)
(B)
(C)
20.
Consider C2H6,C21-14,and C2H2. Which of these has the strongest carbon-carbon bond?
(A)
21.
There is one carbon that has an sp2 hybridization scheme.
There are two carbons that have sp2 hybridization schemes.
There are three carbons that have sp2 hybridization schemes.
C2H6-
C-C
Consider MO (Molecular Orbital Theory). For the 0 2 molecule, there are
electrons in the 02,, bonding orbital?
22.
Molecular orbital theory predicts the Ny ion (a minus one charge) has:
(A)
(B)
(C)
(D)
(E)
+- --
- 2k
three unpaired electrons
six unpaired electrons
pa.k
-...-
.-. -.-.&-+
.- .
%
.""
"...
33
23.
Consider MO (Molecular Orbital Theory). The F2 molecule is:
(D)
(E)
24.
tetramagnetic
gymnasticmagnetic
Molecular orbital theory predicts the 0 z 2 + ion (a positive two charge) has a bond order of:
@
25.
.
r i - - l - * u i P L & < ~ o . > . - ~ -L
Because of Chemistry 122...
(A)
(B)
(C)
I named my cats Linus and Lewis.
I aspire to be a stand up comedian.
I get lots of dates by using pick-up lines that include the words polar, paramagnetic,
(D)
(E)
dipole, lobes, 180 degrees, see-saw, wedge, and orbitals.
My taste in music has improved.
My octahedrals hurt.
[Any response will receive full credit; even no response.]