Oregon State University
Dr. Richard Nafshun
Winter 2007
March 1,2007
Chemistry 122
Exam 2
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 proctor. 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.
M = mol1L
b
= nRT
II
lOOOmL=lL
H Y ~ ~ O K C ~
1.W9
m = mollkg
ATb=ikbm
kb(H20)= 0.5 12 "elm
1 atm = 760 mm Hg
ATf = i kf m
kf ( R O ) = 1.86 "Urn
In[-] A = -kt
R = 0.0821 L*atm/mol*K
2
He
Helium
4
-
4.0026
3
4
5
6
7
8
9
10
Li
Be
B
C
N
O
F
Ne
Lithium
Beryllium
Boron
Carbon
Nioogen
Oxygen
6.941
9.01218
10.81
12.011
14.0067
15.9994
Fluorine ,
18.9984
Neon
20.179
11
12
13
14
15
16
17
18
Na
Mg
A1
Si
P
S
C1
Ar
Sodium
Magnesium
Aluminum
Silicon
Phosphorus
Sulfur
Chlorine
Argon
22.98977
24.305
26.9815
28.0855
M.97376
32.06
35.453
39.948
-
19
20
21
22
23
24
25
K
Ca
Sc
Ti
V
Cr
Mn
Pofxsium
Calcium
Scandium
Titanium
Vanadium
Chromium
Mangancsc
39.0983
40.08
44.9559
47.88
50.9415
51.996
54.9380
27
28
29
30
31
32
33
34
35
36
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Iron
Cobalt
Nickel
Coppcr
Zinc
Gallium
Germanium
Amic
Selenium
Bromine
55.847
58.9332
58.70
63.546
65.38
69.72
72.59
78.96
79.904
Wpton
83.80
26
.Fe
'74.9216
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Rubidium
Soontium
Ymium
Zirconium
Niobium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
85.4678
87.62
91.22
92.9064
95.94
98.906
101.07
102.9055
106.4
107.868
112.41
114.82
118.69
121.75
127.60
126.9045
131.30
55
56
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
Cs
Ba
Hf
Ta
W
Re
0s
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Cesium
Barium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
lridium
Platinum
Gold
Mercury
Thallium
Lcad
Bismuth
Polonium
Astwine
Radon
1329054
137.33
178.49
180.9479
183.85
186.207
190.2
192.22
195.09
196.9665
2WJ9
204.37
207.2
208,9804
(209)
(210)
(222)
87
88
104
105
106
107
108
109
110
Fr
Ra
Rf
Ha
Sg
Ns
Hs
Mt
*
Ill
RuthcrfoFdium
Hahnium
Hassium
Meitnerium
(261)
(262)
(265;
(266)
Francium
Radium
(223)
226.0254
88.9059
57-71
'Rarceanhs
89-103
'Actinides
Molybdenum Technetium
Scsborgium Ncilsbohrium
063)
(262)
*
114
(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
hthanium
Cerium
Samarium
Ewopium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
YtIerbium
Lutetium
138.9055
140.12
140.9077
144.24
I45
150.4
151.96
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
Proractinium
Uranium
Neplunium
Plumnium
Americium
Curium
Bekclium
227.0278
232.0381
231.0359
238.029
237.0482
(244)
(243)
(247)
(247)
Pmcodymium Neodymium Promethium
Californium Kinstcinium
(251)
(254)
,
Fermium
(Z7)
Mendel~vium Nabelium
(258)
259
Lawrencium
262
1.
Consider the phase diagrams below. Which diagram could correctly describe water?
2.
The reaction below will produce:
H
(A)
(B)
(C)
Quartz
A network covalent compound
An ionic compound
(E)
A polymer
3.
Consider the phase diagram below for compound Smashingpumpkinsarebackium. The normal
boiling point is:
(A)
(B)
(C)
(D)
(E)
0 "C.
50 "C
75 "C
100°C
200 "C
1 atm
4.
Lithium fluoride melts at 848 "C. Lithium oxide melts at 1570 "C. The difference in melting
points can be attributed to:
(A)
(B)
(C)
(D)
(E)
-dipole, hydrogen bonding)
Network covalent compounds
One is a molecule (attractions by intermolecular forces), one is an ionic compound
(attractions by charges)
5.
Sodium fluoride melts near 993 "C. Sodium chloride melts near 804 "C. The difference in
melting points can be attributed to:
(A)
(B)
(C)
(D)
(E)
Different intermolecular forces (dispersion, dipole-dipole, hydrogen bonding)
The sheet-like structure
T p f i i ~
cempornd
~ ~ [ L c
1~ w . ~
6.
Ethane, CH3CH3,melts at -172 "C. Lithium oxide melts at 1570 "C. The difference in melting
points can be attributed to:
(A)
(B)
(C)
(D)
(E)
7.
Different intermolecular forces (dispersion, dipole-dipole, hydrogen bonding)
Different ionic charges (+I, +2, +3, -1, -2, -3...)
Different distances between nuclei (ionic size)
-=Eawar;r------
ctions by intermolecular forces), one is an ionic compound
Which of the following is false?
(A)
(B)
(C)
(D)
(E)
Quartz is a network covalent compound.
Network covalent compounds typically melt at higher temperatures than molecules.
8.
Consider CH3CH20Hand CH30CH3. Which of the following statements is false?
(A)
9.
Both compounds exhibit dispersion forces.
//d
Lowest mu
(D)
(E)
10.
/
J
/
vConsider LiF, Ne, H20, diamond, CH3CH2CH3,Li20, LiC1, and A1203. Arranged in increasing
melting point, these are:
Hiphest mp
Ne < CH3CH2CH3< H 2 0 <LiF < LiCl< Li20 < A1203 < diamond
LiF < Ne < H 2 0 < diamond < CH3CH2CH3< Li20 < LiCl< A1203
Which of the following has a hydrophilic end (polar, water-loving end) and a hydrophobic end
(non-polar, water-fearing end) and has the ability to bridge water molecules to non-polar
molecules?
(B)
(A)
(C)
(D)
(E)
lithium chloride
helium
diamond
11.
Which of the following compounds cannot undergo free radical polymerization?
(B)
12.
CC12CC12
Which of the following molecules will p
&
H
H
H
H
I l
I HI
H
l
I
H
1
I H
H-C-C-C-
form hydrogen bonds?
H
C-0-H
'fL5
I
H
H
I
H
H
I
H
H
H
I -ye5
H
H-F
13.
The intermolecular forces that are most significant in accounting for the high boiling point of
liquid water relative to other substances of similar molecular weight islare the:
(A)
(B)
(C)
(Dl
(E)
Dispersion forces
ole interactions
ces
Ionic charges
14.
Compounds with relatively high vapor pressure have:
(D)
15.
Which of the following best describes the properties of a typical metal?
(A)
(B)
(C)
(D)
16.
Lustrous, low melting point, low density, malleable
The equivalent number of atoms in the BCC unit cell is:
(B)
(C)
(D)
(E)
17.
high boiling points and strong intermolecular forces
b
2
3
4
6
The structure below [from a Co
(A)
(B)
(C)
(D)
(E)
rhheet] represents:
A stem unit cell
An anterior lens epithelial unit cell
- \
18.
(A)
(B)
(C)
(D)
(E)
19.
(-3
The boiling point of 2.450 m aqueous MgC12 is:
+107.5 "C.
+ 7.53 "C.
@ 8 3
+102.5 "C.
-9.1 14 "C.
\
D%=
kb
\
M
A student dissolves 5.66 g of an unknown protein in 1750 mL of water at 300 K. She measures
the osmotic pressure to be 0.71 1 mm Hg. What is the molar mass of the protein?
+---
9
ma,
(C)
(D)
(E)
6.65 x
glmol.
1.17~10~g/mol.
2.08 x lo4 glmol.
5,bC3
From
problcn
=/
tt-vyr\PT
n=
=! =
\?l-
20.
----
Why is molality used as the unit of concentration rather than molarity for colligative property
calculations?
(D)
(E)
Molarity can only be used with network covalent compounds.
Molarity can only be used with hydrophobic molecules.
2 1.
The half-life is:
The amount of time required for the entire sample to decay
(A)
(B)
(C)
(D)
(E)
y a few atoms remain
The 20 minute period between the second and third quarters of a football game
:!)'
22.
.
(A)
(B)
(C)
(D)
(E)
23.
(p
A student
.
) obtains a 10.00 gram sample of 14c(tin = 5750 years). How many grams
of I4cwill remain after 11,500 years?
10.00 grams
5.00 grams \o 9
-g
2.00 grams
1.25 grams
(7
A student
) obtains a 10.00 gram sample of "C (tm = 5750 years). How long will it take
so that only 2.00 grams of 13'1remain?
(A)
(B)
E
i;
(El
5750 years
11,500 years
c:
3,351
years
years3
years
0C ~ \ C\C
\
t h y =-kh&
- 0.69).= '
(5350.0
-'4
k = \ ,2\ x\o
J
3
24.
The data below were obtained for ethyl acetate. Estimate by interpolation the temperature when
the vapor pressure is 700 torr.
ethyl acetate
Temp. ( O C )
V.P. (tom]
10
45
20
74
30
118
40
? 85
50
282
60
417
70
80
S!
L
B
L
2
9
P
tm
.d
-E
4%-
90
3
?I24
Temperature
(C)
(D)
(E)
75.1 "C.
75.4"C.
78.7 "C.
C
597
$ 3 3 ~
t o
+wr
c
- - \oa
-
r t
X
( 0 3h r r
25.
x=
L\,'IZ~L
T=7 0 4 C + q,qpc=79 &q0CL
The Chemistry 122 final exam is Monday, March 19,2007 at 7:30am; yes, this is only three
hours after my ordinary bedtime. After the chemistry final I will be.. .
(A)
(B)
(C)
(Dl
(El
Sleeping
Hosting the best Spring Break Party ever
Two words: You Tube
sox (because it will be
ames in Ft. Myers, Florida)
-,
[Any response will receive full credit; even no response.]