Exam 1 Spring 2002 - WebPhysics

Chemistry C101/A944
Spring 2002 KA
Examination 1
Directions:
1.
Both your name and identification number must be included and balloons properly darkened. Any
errors may result in a point penalty.
2.
Choose the best answer in each of the following. Using a #2 pencil, fill in the corresponding balloon on
your scoring sheet.
Potentially Useful Information
5
× (°F – 32°F)
9
q = mC∆T
°C =
1 mile ≡ 5280 ft
°C = K – 273
1 inch ≡ 2.54 cm
1 amu = 1.6606 × 10–24 g
1 mL ≡ 1 cm3
mass of proton: 1.6726 × 10–24 g
c = 3.000 × 108 m/sec
mass of electron: 9.1094 × 10–28 g
1 cal = 4.184 J
mass of neutron: 1.6749 × 10–24 g
The symbol “≡” means “identical to”, that is, with infinite precision (usually because it’s a definition).
s-block
d-block transition metals
p-block
DEPARTMENT OF CHEMISTRY • INDIANA UNIVERSITY -PURDUE UNIVERSITY INDIANAPOLIS
1
18
1A
8A
1
H
2
13
14
15
16
17
1.0079
2A
3A
4A
5A
6A
7A
3
4
5
6
7
8
9
Li
Be
B
C
N
O
F
6.941
9.0122
10.811
12.0107
14.0067
15.9994
18.9984
11
12
13
14
15
16
17
22.990
24.305
19
20
3
Na Mg
K
39.098
Ca
4
5
3B
4B
5B
6B
7B
21
22
23
24
25
Sc
40.078
44.956
38
39
85.468
87.62
88.906
55
56
57
37
Rb
Cs
Sr
Ba
Ti
47.867
La
V
Cr
50.9415
51.996
41
42
91.224
92.906
95.94
72
73
74
40
Y
6
Zr
Hf
Nb Mo
Ta
W
7
8
9
26
27
10
11
1B
2B
26.9815
28.0855
30.9738
32.066
35.4527
28
29
30
31
32
33
34
35
8B
Mn
Fe
54.938
55.845
43
44
Tc
Ru
Co
58.933
45
Rh
Ni
12
Cu
58.6934
Zn
63.546
46
65.39
47
Pd
48
Ag
Cd
79.904
52
53
Te
107.868
112.411
114.818
118.710
121.760
127.60
126.904
79
80
81
82
83
84
85
Re
Os
Ir
Pt
Au
Hg
180.948
183.84
186.207
190.23
192.217
195.078
196.967
200.59
105
106
107
108
109
110
111
112
[227.0]
[261.1]
[262.1]
[263.1]
[264]
[265.1]
[268]
[269]
[272]
[277]
Bh
Hs
Mt Uun Uuu Uub
Tl
204.383
Pb
207.2
Bi
208.980
Po
[208.98]
Lanthanide
series
Actinide
series
Ce
59
Pr
60
61
62
144.24
[144.9]
150.36
151.964
157.25
158.93
162.50
164.930
93
94
95
96
97
98
99
[243.1]
[247.1]
Nd Pm Sm
140.116
140.908
90
91
92
231.036
238.029
Th
232.038
Pa
U
Np
[237.0]
Pu
[244.1]
63
Eu
64
Gd
Am Cm
65
Tb
Bk
[247.1]
66
Dy
Cf
[251.1]
67
Ho
Es
[252.1]
At
[209.99]
4.0026
10
Ne
20.1797
18
Ar
39.948
36
Kr
83.80
54
Xe
131.29
86
Rn
[222.0]
Visit our website:http://www.chem.iupui.edu
f-block transition metals
58
I
78
104
Sg
51
Sb
78.96
106.42
178.49
Db
50
Sn
Br
77
89
Rf
49
In
74.9216
Se
102.906
138.906
Ac
72.61
Cl
76
88
Ra
69.723
As
S
101.07
137.327
[226.0]
Ge
P
75
87
Fr
Ga
Si
[98]
132.905
[223.0]
Al
2
He
68
69
70
167.26
168.934
173.04
174.967
100
101
102
103
[257.1]
[258.1]
[259.1]
[262]
Er
Tm Yb
Fm Md No
71
Lu
Lr
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© 1999, Department of Chemistry,
Indiana University –Purdue University
Indianapolis
Each question is worth 4 points. Choose the BEST answer.
1.
Gold, silver and lead are represented by the symbols:
a.
b.
c.
d.
e.
2.
Which symbol represents a nonmetal?
a.
b.
c.
d.
e.
3.
transition metals.
alkaline earth metals.
alkali metals.
halogens.
rare earths.
Which of the following elements is misspelled?
a.
b.
c.
d.
e.
6.
the weight of the first isotope discovered.
the weight of the most stable isotope.
an average of the weights of all naturally-occurring isotopes.
the weight of the heaviest isotope known.
the sum of the weights of all stable isotopes.
The elements Cr and Mo are examples of
a.
b.
c.
d.
e.
5.
Ni
Cl
Mn
Si
Sr
The atomic weight listed for an element on the periodic table is
a.
b.
c.
d.
e.
4.
Au, Si, Hg
Ag, S, Pb
Au, Sr, La
Au, Ag, Pb
none of the above
silicone
chlorine
potassium
uranium
all are correctly spelled
Which of the following is an alkaline earth metal?
a.
b.
c.
d.
e.
arsenic
strontium
vanadium
rubidium
uranium
7.
An atom with a mass number of 59 that has 28 protons will have _____ neutrons.
a.
14
b.
28
c.
31
d.
59
e.
87
8.
What
a.
b.
c.
d.
e.
is the approximate mass of 10 chromium atoms?
10 amu
24 amu
52 amu
240 amu
520 amu
9.
When
a.
b.
c.
d.
e.
a substance undergoes a physical change
it always undergoes a change of state.
the process cannot be reversed.
a new substance is produced.
its chemical composition remains unchanged.
heat is always given off.
10.
What is the approximate mass in grams of 100 atoms of fluorine?
a.
b.
c.
d.
e.
11.
12.
19 g
190 g
1.6 × 10–22 g
3.2 × 10–21 g
3.2 × 10–24 g
The number 78.6543 should be correctly rounded to what value in order to have exactly 3
significant figures?
a.
80.0
b.
78.6
c.
78.7
d.
78.654
e.
7.86 × 10–3
Which of the following would you expect to be chemically similar to chlorine?
a.
Ar
b.
F and Br
c.
Se and Ne
d.
O and Kr
e.
P and S
13.
A neutral atom with 16 protons and 14 neutrons has
a.
b.
c.
d.
e.
atomic
atomic
atomic
atomic
atomic
number
number
number
number
number
=
=
=
=
=
16,
14,
16,
14,
16,
mass
mass
mass
mass
mass
number
number
number
number
number
=
=
=
=
=
14, symbol: Si
30, symbol: Si
30, symbol: S
30, symbol: S
32.066, symbol: S
14.
A single orbital may, at most, contain
a.
1 proton.
b.
2 protons.
c.
6 protons.
d.
2 electrons.
e.
6 electrons.
15.
The formula for a compound consists of 1 magnesium atom, 1 sulfur atom and 4 oxygen
atoms. Which of the following is the correct formula?
a.
b.
c.
d.
e.
16.
Which of these orbitals has the highest energy?
a.
b.
c.
d.
e.
17.
18.
MgSrO
MgSO
MgSO4
MgS 4 O
MgSFO 4
1s
2s
3s
4s
5s
Which characteristics correctly describe a neutron?
a.
charge of +1; mass approximately 1 amu; located inside the nucleus
b.
charge of –1; mass approximately 1 amu; located inside the nucleus
c.
charge of 0; mass approximately 1 amu; located inside the nucleus
d.
charge of 0; mass approximately 1 amu; located outside the nucleus
e.
charge of 0; mass approximately 1 × 103 amu; located inside the nucleus
How many nanoliters are in 1 L?
a.
b.
c.
d.
e.
103
106
109
10–6
10–9
19.
A property of sodium metal is:
a.
b.
c.
d.
e.
20.
The nucleus is held together by
a.
b.
c.
d.
e.
21.
190 n
75 n
190 n
115 n
114 n
concrete, air
rubbing alcohol, liquid hand soap
salt water, helium gas
anhydrous ammonia, aluminum foil
air, motor oil
How much heat would be required to increase the temperature of 5.0 grams of water by
10.0 °C? The specific heat of water is 1 cal/g⋅°C.
a.
b.
c.
d.
e.
24.
114 p
115 p
75 p
75 p
76 p
Which of the following pairs consists of an example of a mixture and an example of a pure
substance?
a.
b.
c.
d.
e.
23.
electromagnetic radiation.
nuclear strong force.
electrostatic attraction.
gravitational force.
all of the above.
A charged atom (-1) has 76 electrons and has a mass number (A) of 190. How many protons
and neutrons are in the nucleus of this atom?
a.
b.
c.
d.
e.
22.
shiny or silvery appearance
reaction (often violently) with water
reaction with halogens to make 1:1 compounds
all of the above
none of the above
1 cal
5 cal
10 cal
50 cal
500 cal
What is the mass of 2.00 in3 of mercury? Note: The density of mercury is 13.6 g/cm3 .
a.
b.
c.
d.
e.
2.67 g
27.2 g
69.1 g
223 g
446 g
many electrons are in an atom with electron configuration: 1s2 2s2 2p6 3s2 3p6 ?
5
8
10
11
18
25.
How
a.
b.
c.
d.
e.
26.
Which of the following is a physical change or property?
a.
b.
c.
d.
e.
27.
oil floats on water
setting of concrete
iron rusts
digestion of protein
natural gas burns
Suppose 5.0 kcal is absorbed by equal masses of each of the following metals. Which of the
metals would have the smallest temperature increase?
Au: 0.031 cal/g⋅°C
a.
b.
c.
d.
e.
28.
29.
Cu: 0.091 cal/g⋅°C
Fe: 0.106 cal/g⋅°C
Mg: 0.245 cal/g⋅°C
Au
Cu
Fe
Mg
all would have the same temperature increase
The atomic weight of hydrogen from the periodic table is 1.0079 amu. From this
information, what is the likely approximate isotopic composition of naturally occurring
hydrogen on earth?
a.
mostly protium (no neutrons)
b.
mostly deuterium (1 neutron)
c.
mostly tritium (2 neutrons)
d.
equal amounts of protium, deuterium and tritium
e.
equal amounts of protium and deuterium, with a lesser amount of tritium
Which of the following contains exactly 44 neutrons?
a.
Ti-22
b.
I-131
c.
Sc-44
d.
101
e.
78
Ru
Se
30.
Which digit is uncertain in the following mass?
a.
b.
c.
d.
e.
31.
32.
Which of the following is equivalent to 75.0 grams?
a.
7.50 × 10–4 mg
b.
c.
d.
e.
7.50 × 104 mg
7.50 × 107 mg
7500 mg
0.0750 mg
Arrange the following electromagnetic radiation in order of increasing energy:
a.
b.
c.
d.
e.
33.
green
infrared
I
II
III
ultraviolet
IV
blue
V
I < II < V < III < IV
IV < III < V < II < I
II < I < III < V < IV
III < I < II < V < IV
V < IV < II < I < III
1s2 2s2 2p6 3s2 3p6 4s2 3d104p6 5s2 4d10
1s2 2s2 2p6 3s2 3p6 4s2 3d104p6 5s2
1s2 2s2 2p6 3s2 3p6 4s2 3d104p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10
1s4 2s4 2p123s4 3p124s4 3d8
Which is a spherically-shaped region of electron density?
a.
b.
c.
d.
e.
35.
red
What is the electron configuration for an uncharged (neutral) cadmium atom?
a.
b.
c.
d.
e.
34.
54.3210 g
0
1
2
3
4
any orbital in an s subshell
any orbital in a p subshell
3d orbital
4f orbital
none of the above
Benzyl salicylate, a sunscreen, melts at 24°C and boils at 320°C. At which temperature
would benzyl salicylate be a liquid?
a.
0°C
b.
20°C
c.
500°C
d.
0°F
e.
212°F
36.
Add the following numbers (all are mass measurements in g) and ensure the sum has the
proper number of significant figures:
25.34
102.
+
0.055
a.
b.
c.
d.
e.
37.
The density of a solution is 1.19 g/mL. What is the mass of 25 mL of this solution (with
proper attention to correct significant digits)?
a.
b.
c.
d.
e.
38.
40.
0.048 g
21 g
21.0 g
29.8 g
30 g
A calcium atom that has lost two electrons has the same number of electrons as a neutral
atom of:
a.
b.
c.
d.
e.
39.
127
127.395
127.4
127.40
130
Ti
Ar
Mg
K
Be
The temperature 70°F is about the same as
a.
21 K
b.
70 K
c.
294 K
d.
343 K
e.
431 K
Convert 5.0 × 10–8 cm to units of Å. Note that 1 Å is exactly 10–10 m.
a.
0.50 Å
b.
c.
d.
e.
5.0 Å
50 Å
5.0 ×10-2 Å
5.0 ×101 Å

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