Exam 1
CHEMISTRY O 11
February 14,2006
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Chem 1 1
Exam 1
February 14,2006
Choose the best answer for each of the following questions. Fill in the corresponding oval
on the scantron sheet. Be sure to indicate the proper test form on the scantron sheet.
Remember to use the correct significant digits.
1. Write 8,319in standard scientific notation.
[A]8,319
[B] 8.319 x lo3
[C]8.319 x 1000
[Dl 8.319 x
[El 831.9x 10'
2. The number 0.00003007expressed in exponential notation is
[A]3.007 x
.
[B]3.007x lo5
[C]3.7 x
[Dl 3.007
[El 3.007 x
3. The measurement 4.3 x lo3 g also could be written as
[A]4.3mg
[Bl 4.3pg
[C]4.3dg
[Dl 4.3 g
[El 4.3kg
4. Using the rules of significant figures, calculate the following: 14.8903- 2.14 =
[A]12
[B] 12.7503
[C]12.75
[Dl 13
[El 12.750
[Dl 23
[El 4
[Dl5.0
[El 4.8
5. How many significant figures are in the number 6.022x
[A1 27
[Bl 3
[CI 1
6. The number 4.89rounded to two significant figures is
[A]4.9
[B]4.90
[cl 5
7. How many significant figures are there in the result of the following calculation?
(4.32112.8)x (6.9234x
[A1 1
8. 423 K equals
lo5)
[Bl 2
[A] 696.OC
[CI 5
[El 3
[Dl4
[B] 150.0~ [C]'
150.0C
.
[Dl273,"F
[El 696.OF
9. If 1.000kg equals 2.205 lb, what is the mass in pounds of a human who weighs 75.0kg?
[A]34.10 1b
[B]75.05 lb
[C]145.91b
[Dl 165.41b
[El none of these
10. Water has a density of 1.0 g/mL. Which of the objects will float in water?
Object I: mass = 50.0 g; volume = 60.8 mL
Object 11: mass = 65.2 g; volume = 42.1 mL
Object 111: mass = 100.0 g; volume = 20.0 mL
[A] 11,111
[C] I, 111
[Bl 1
[Dl 111
[El 11
1 1. Helium is an example of
[A] a compound
[B] a homogeneous mixture
[Dl an element
[C] a heterogeneous mixture
12. The amount of energy needed to heat 2.00 g of carbon from50.0°C to 80.0°C is 42.6 J. The specific heat
capacity of this sample of carbon is
[A] 1.42 J/g "C
[B] 2556 J/g "C
[C] 639 J/g "C
[Dl 0.710 J/g OC
[El 0.355 J/g "C
13. A 6.75-g sample of gold (specific heat capacity = 0.130 J/g "C) is heated using 50.6 J of energy. If the original
temperature of the gold is 25.0°C, what is its final temperature?
[A] 5 7 . 7 " ~
[B] 43.4"C
[C] 82.7OC
14. Heat is typically measured in
[A] joules
15. The symbol for beryllium is
[A] Be
16. The symbol for manganese is
[A] Mg
[Cl
[Bl grams
[C] B1
[B] Ber
[B] Mn
[El 2 4 . 4 " ~
[Dl 32.7"C
[C] Mo
[Dl
"F
[El
[Dl B
[Dl Ma
"c
[El
Br
noneofthese
17. A substance composed of two or more elements combined chemically in a fixed proportion by mass is
[A] a mixture
[B] an atom
[C] a compound
[Dl a solid
[El
none of these
18. The total number of oxygen atoms indicated by the formula Fe2(C03)3 is
[A1 6
[Bl 3
[CI 12
[Dl 18
[El 9
19. Which of the following contains the largest number of oxygen atoms?
[Bl 3C02
[A]
[Cl
Al(N03)3
LEI
H2S04
[Dl proton
[El
none of these
[Dl i p t
[El :;Xe
[Dl 0 3
20. Which atomic particle determines the chemical behavior of an atom?
[A] neutron
[B] electron
[C] nucleus
21. An atom that has 54 protons, 54 electrons, and 78 neutrons is
[A]
Cs
[B] '::~e
[C] ';:~t
22. The number of neutrons in one atom of ':,6~g is
[A] 124
[cl 82
[B] 288
[Dl 206
[El none of these
[Dl Sc
[El Na
23. Which of the following elements is an alkali metal?
[A1 Fe
[Cl
[Bl Cu
Ca
24. Which of the following elements is most similar to chlorine?
25. Choose the false statement.
[A] 1 mol of carbon atoms weighs 12.0 g
[B] 6.02 x
hydrogen atoms weigh 1.008 g
[C] Fluorine is a diatomic gas.
[Dl 6.02 x
atoms = 1 mol of atoms
[El 1 rnol = 6.02 x
amu
26. Calculate the molar mass of a sample if a single molecule weighs 5.34 x
g.
[C] 5.34 x lo-23 glmol
[A] 12.0 glmol
[B] 32.2 glmol
[Dl 1.13 x 1o~~ glmol
[El none of these
27. A 20.0-g sample of Ca contains how many calcium atoms?
[A] 6.02 x
[C] 0.500 atoms
[B] 40.1 atoms
atoms
[Dl 20.0 atoms
[El 3.0 x
atoms
28. A mole of sulfur trioxide molecules contains how many oxygen atoms? (50 3 )
[A] 1.807 x
[C] 3.01 x
[B] 32
[Dl 1.204 x
[El 6.02 x
29. The distance between two successive peaks or troughs in a wave is called
[A] the amplitude
[B] the frequency
[Dl the speed
[El none of these
30. The
[A] wavelength
[C] the wavelength
indicates the number of waves that pass a given point per second.
[B] amplitude
[C] frequency
[Dl speed
[El none of these
Chem 11 USEFUL INFORMATION
(A PERIODIC TABLE IS ATTACHED TO THIS EXAM)
Where,
Q is energy (heat) required
s=specific heat capacity
m=rnass of sample
AT = change in temperature
Specific heat of water = 1 caVgPC
1 cal = 4.184 J
-
T(OC)
+ 273 = T (K)
T('F) = 1.80 (T'c)
+ 32
PERIODIC TABLE of the ELEMENTS (2003)
MAIN GROUPS
M A N GROUPS
1A
1
1
8A
18
2
3
2A
2
4
Li
Be
6.941
9.012
11
12
H
1.00s
3A
13
5
TRANSITION METALS
22990
Mg
3B
24.305
19
20
21
Na
B
10.811
46
4
22
58
5
23
68
6
24
78
7
25
8B
8
26
86
9
27
86
10
28
18
11
29
13
26
A1
l2 28.982
30
31
4A
14
6
5A
15
7
6A
16
8
O
,
7A
He
l7 4.003
10
9
C
N
12.011
14.007
15.999
F
18.998
N
20.180
e
14
15
16
17
18
S/
P
S
CI
Ar
28.086
30.974
32066
35.453
39.948
32
33
34
35
36
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
39.098
40.078
44.956
47.867
50.042
51.998
54.938
55.845
58.933
58.693
63.W
65.39
69.723
72.81
74.992
78.96
79.904
83.80
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Rb
Sr
Y
Zr
85.468
87.62
88.908
91.224
55
56
57
72
Nb
92.-
Mo
Tc
Ru
Rh
Pd
Cd
In
Sn
Sb
Te
95.94
[98]
101.07
102.90
108.42
107.87
112.41
114.82
118.71
121.76
127.60
126.90
13129
74
75
76
77
78
79
80
81
82
83
84
85
86
73
Ag
Cs
Ba
La*
Hf
Ta
W
Re
0s
Ir
Pt
Au
132.91
137.33
138.91
178.49
180.95
183.84
188.21
190.23
192.22
195.08
196.97
200.59
87
88
89
104
105
106
107
108
109
110
111
112
Ra Ac** Rf
[m ,
12621
[ a ]
[2721
[rrr]
Fr
12231
[226]
Db
Sg
I-
Bh
Hs
Mt
(2641
[265]
12681
Hg
Xe
TI
Pb
Bi
Po
At
Rn
204.38
207.2
208.98
12091
(2101
116
[=A
118
, [2891
[2931
114
,
I
[2851 ,