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Chem-110, Final exam model
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Useful information:
Speed of light, c = 3.0×108 m/s
Planck’s const., h = 6.626×10-34 J.s
Avogadro’s No., Nav = 6.022×1023 mol-1
Energy const. for H atom B = 2.179×10-18 J
Frequency const. for H atom B/h = 3.289×1015 s-1
Mass of the electron, me = 9.11 x 10-31 kg
Gas constant, R= 0.082 L atm K-1 mol-1 = 8.314 JK-1mol-1
PERIODIC TABLE
1
H
Relative atomic mass to
nearest whole number
Hydrogen
1
7
9
Li
Be
Lithium
Beryllium
3
23
4
24
Key
12
Helium
11
Symbol
Atomic number
C
Carbon
6
Na Mg
4
He
12
14
16
19
2
20
B
C
N
O
F
Ne
Boron
Carbon
Nitrogen
Oxygen
Flourine
Neon
5
27
6
28
7
31
8
32
9
35.5
10
40
Al
Si
P
S
Cl
Ar
Sodium
Magnesium
Aluminum
Silicon
Phosphorus
Sulfur
Chlorine
Argon
11
39
12
40
13
70
14
72.5
15
75
16
79
17
80
18
84
45
48
K
Ca
Sc
Ti
Potassium
Calcium
Scandium
Titanium
19
85.5
20
86
21
89
22
91
51
52
V
Cr
Vanadium Chromium
23
93
Rb
Sr
Y
Zr
Rubidium
Strontium
Yttrium
Zirconium
37
133
38
137
39
139
40
178.5
24
96
Nb Mo
55
56
59
42
184
63.5
65
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
25
(96)
26
101
27
103
28
106
29
108
30
112
31
115
32
119
33
122
34
128
35
127
36
131
Tc
Niobium Molybdenum Technetium
41
181
59
43
186
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
44
190
45
192
46
195
47
197
48
201
49
204
50
207
51
209
52
(210)
53
(210)
54
(222)
Cs
Ba
La
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Cesium
Barium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
55
(223)
56
(226)
Lanthanum
72
(261)
73
(262)
74
(266)
75
(264)
76
(265)
77
(268)
78
79
80
81
82
83
84
85
86
Rf
Db Sg
57
(227)
Fr
Ra
Ac
Francium
Radium
Actinium
87
88
89
Rutherfordium Dubnium Seaborgium
104
105
106
Bh
Hs
Mt
Bohrium
Hassium
Meitnerium
107
108
109
140
141
144
152
157
159
162.5
165
167
169
173
175
Ce
Pr
Nd
Pm Sm Eu
145
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Cerium
Praseodymium
Neodymium
Promethium Samarium Europium
58
59
60
61
150
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
62
63
64
65
66
67
68
69
70
71
(243)
(262)
232
231
238
237
244
(247)
(247)
(251)
(252)
(257)
(258)
(259)
Th
Pa
U
Np
Pu Am Cm
Bk
Cf
Es
Fm Md
No
Lr
Thorium
Protactinium
Uranium
Neptunium
90
91
92
93
Plutonium Americium
94
95
Curium
Berkelium
96
97
Californium Einsteinium
98
99
Fermium
Mendelevium
Nobelium
Lawrencium
100
101
102
103
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1-
The rate of effusion of methane (CH4) gas to the ammonia (NH3) gas is:
17
16
16
17
abcd17
16
16
17
2The atomic size increases in the periodic table from:
a- up to down
b- down to up
c- from left to right
d- none of the above
3The hybridization of orbitals in the geometrical shape of an octahedron is:
a- sp2
b- sp3
c- sp3 d1
d- sp3 d2
4The angle values of an octahedron are:
a- 180º + 30º
b- 180º + 60º
c- 180º + 90º
d- 180º + 120º
5The equilibrium constant at (900ºC) equals (Kp = 1.3) for the following
reaction:
CO2 (g) + H2 (g)
CO (g) + H2O (g) equation-1
Kp for the reaction equation-2 {2 CO2 (g) + 2 H2 (g)
equation-2 equals:
a- Kp = 1.3
b- Kp = 1.7
c- Kp = 163.5
2 CO (g) + 2 H2O (g)}
d- Kp = 96.2
6According to the Valence shell Electron-Pair Repulsion theory the geometric shape
of (XeF4) is:
a- (square planar) b- (square pyramid) c- (irregular tetrahedron)
d- (octahderon)
7-
The concentration values for the following reaction will not change:
A (g) + B (g)
a- if temperature changes
c- if volume changes
C (g) + E (J)
b- if pressure changes
d- none of the above
8An
increase
of
temperature
for
the
reaction
CaCO3 (s) + 158 kJ
CaO (s) + CO2 (g)
a- increases in CaCO3 only
b- increases in CO2
c- increases in CaO only
d- increases in CaO + CaCO3
causes:
9A sample of a gas occupies (25 mL) at standard temperature and pressure
(STP). What will be the temperature when the volume increases to (60 mL) and the
pressure to (1900mmHg)?
a- 1638ºC
b- 1365ºC
c- 1365K
d- 45.5ºC
10What is the number of grams of a gas with a molecular weight of (40.0 g/mol) at
(273ºC) and a pressure of (3.50 atm) and a volume of 5000 mL)?
a- 31.27 g
b- 15.62 g
c- 15623 g
d- 1.275 g
The number of sulfur's atom in (5.0 g) of (Na2SO4 · 5 H2O) is:
5
5
ax 2 x 6.02 x 1023
bx 5 x 6.02 x 1023
158
32
5
5
cx 6.02 x 1023
dx 2 x 6.02 x 1023
232
64
11-
12The kind of bonds in the chlorine molecule (Cl2) and bromine molecule (Br2)
is:
a- covalent in chlorine molecule and ionic in bromine molecule
b- covalent in chlorine molecule and covalent in bromine molecule
c- covalent in bromine molecule and ionic in chlorine molecule
d- ionic in bromine molecule and ionic in chlorine molecule
13a- 8
The maximum number of electrons the fourth level (n = 4) is:
b- 16
c- 18
d- 32
14-
Du Broglie Equation is:
a- ν =
c
λ
15-
If the equilibrium constant for reaction-1
c- E = mc2
b- E = hv
SO2 (g) +
(Kc) for reaction-2
a- 2
1
2
O2 (g)
2 SO2 (g) + O2 (g)
b- 4
SO3 (g)
d- mv =
h
λ
is (Kc = 4.0):
2 SO3 (g)
is:
c- 8
d- 16
16The possible quantum numbers for an electron in an atom is:
a- n = 3, l = 3, ml = 1, ms = 1/2
b- n = 3, l = 2, ml = 3, ms = 1/2
c- n = 3, l = 2, ml = 2, ms = 1/2
17-
d- n = 3, l = 1, ml = 2, ms = 1/2
Which of the following is not an SI base unit?
a- kilometer
18-
b- kilogram
c- second
d- Kelvin
What is (5.6792 m + 0.6 m + 4.33 m) expressed in the correct units with the
correct number of significant figures?
a- 10.6092 m
19-
b- 10.609 m
c- 10.60 m
d- 10.6 m
How many seconds are there in a solar year (365.24 days), expressed in the
correct number of significant figures?
a- 3.1557 × 108 s
b- 3.1557 × 107 s
c- 5.2595 × 105 s
d- 3.1 × 107 s
20- The reaction below was studied at a high temperature. At equilibrium, the partial
pressures of the gases are as follows: PCl5 = 1.4
3.0
10-2 atm, Cl2 =
10-1 atm. What is the value of Kp for the reaction?
PCl5(g)
PCl3(g) + Cl2(g)
a. 4.3 × 10-4
21.
10-4 atm, PCl3 = 2.4
b. 0.019
c. 0.32
d. 51
e. 2.3
103
Aluminum is a lightweight metal (density = 2.70 g/cm3). What is its density in
kg/m3?
a- 4.30 × 103 kg/m3 b- 2.70 × 104 kg/m3 c- 2.70 × 103 kg/m3 d- 8.2 × 102 kg/m3
22.
Which of the following elements has a common ion with a 2+ charge?
a- Li
23.
b- Mg
d- I
What do we call atoms of the same elements with different mass numbers?
a- α particles
24.
c- S
b- isomers
d- nuclei
c- isotopes
Chalcopyrite, the principal ore of copper (Cu), contains 34.63 percent Cu by
mass. How many grams of Cu can be obtained from 5.11 × 103 kg of the ore?
a- 147 kg
25.
b- 1.77 × 106 g
2+
The number of protons, neutrons, and electrons in ( 59
) is:
28 Ni
a- 28 e−, 31 n, 28 p
b- 28 e−, 31 n, 26 p
c- 26 e−, 31 n, 28 p
d- 26 e−, 28 n, 28 p
26.
d- 1.77 × 104 g
c- 147 g
The depletion of ozone (O3) in the stratosphere has been a matter of great
concern among scientists in recent years. It is believed that ozone can react with nitric
oxide (NO) that is discharged from the high-altitude jet plane, the SST. The reaction
O3 + NO → O2 + NO2
is
If 0.740 g of O3 reacts with 0.670 g of NO, how many grams of NO2 will be produced?
a- 1.410 g
27.
b- 0.670 g
c- 0.709 g
d- 0.493 g
The molecular weight of the empirical formula of a compound (C5H9O3) is (117
g/mol), if the molecular weight of the compound is (234 g/mol), the molecular formula
of the compound is:
a- C9H6O6
28.
b- C10H18O6
c- C9H18O2
d- C6H12O6
The wavelength of an electromagnetic light with a frequency (ν
ν = 1.2 x 1015 s−1)
is:
a- 250 nm
b- 8.3 x 10−16 m
c- 2.5 x 10−7 cm
d- 250 Å
29.
The number of grams of potassium hydroxide (KOH) (MW KOH = 56 g/mol)
required to prepare a 400 mL of a 0.25 M (KOH)-solution are:
a- 12.4 g
30.
b- 89.8 g
d- 8.981 g
c- 5.6 g
The molecular weight of saccharin is 183.18 g/mol and the compound is
45.90% carbon, 2.75% hydrogen, 26.20% oxygen, 17.5% sulfur, and 7.65% nitrogen.
What is the empirical formula of saccharin?
a- C7H5O2SN
31.
c- C7H4O3SN
d- C7H5O3SN
The electron transition level of the hydrogen atom in the Paschen-series is:
a- First level
32.
b- C6H5O3SN
b- Second level
c- Third level
d- Fourth level
The De Broglie wavelength of an electron (me = 9.1 x 10−28 g) with a speed of (ve
= 1 x 106 m/s) is:
a- 7.3 x 10−10 cm
33.
a- 10
35.
a- 2
c- 7.3 x 10−7 m
d- 7.3 x 10−13 m
The electronic configuration of antimony atom (51Sb) is:
a- [Kr] 5s2 4d3
34.
b- 7.3 x 10−10 m
b- [Kr] 5s2 4d9 5p4
c- [Kr] 5s2 4d10 5p3 d- [Kr] 5s1 5p5
How many electrons have (ll = 0) antimony atom (51Sb) for ?
b- 11
c- 12
d- 13
How many unpaired electrons are in antimony atom (51Sb)?
b- 3
c- 4
d- 5
37- The result of the mathematical operation [268.8 + (281.9 x 2.593)] to three Significant
Figures is:
a- 9.99 x 102
b- 9.99 x 103
c- 1.000 x 103
d- 1.00 x 103
38- The Ca2+ has the same electronic configuration as one of the following elements (Ar, Na,
Ne, F):
a- F
b- Ne
c- Na
d- Ar
39- The ground state of nitrogen atom (7N) is:
40- When (C8H16) is burned in oxygen atmosphere, we obtain (CO2) and (H2O) according
to the following equation:
a C8H16 + b O2 → c CO2 + d H2O
In a balanced equation, the factors a, b, c, and d have the values:
a- (a = 1, b = 1, c = 1, d = 1)
b- (a = 1, b = 12, c = 8, d = 16)
c- (a = 1, b = 12, c = 8, d = 8)
d- (a = 1, b = 6, c = 8, d = 16)
41- If the equilibrium constant (K1) for the following reaction equals:
2 SO3 (g)
2 SO2 (g) + O2 (g)
The value of (K2) for the reaction:
a- K 2 = K 1
b- K 2 =
1
K1
4 SO3 (g)
4 SO2 (g) + 2 O2 (g) equals:
c- K 2 = K 12
42- The hybridization of carbon atom in (C2H4) is:
a- sp2
b- sp3
c- sp3 d1
d- K 2 =
1
K 12
d- sp3 d2
43- The percentage of carbon atom for a compound is (60.87%), which of the formula is
the empirical formula
a- (C7H6O4)
b- (C7H6O3)
c- (C7H6O2)
d- (C7H6O)
44- When two s-atomic-orbitals form a linear combination, the molecular orbital
obtained, is::
a- s
b- p
c- σ
d- π
45- In 0.500 mol of Na2CO3 10 H2O there are:
a- 3.01 x 1023 Na-atoms
c- 6.02 x 1023 H2O-molecules
b- 6.02 x 1024 H-atoms
d- 7.826 x 1023 O-atoms
46- Two moles of oxygen at STP occupy a volume of:
a- 16 L
b- 32 L
c- 22.4 L
47- Increasing the pressure for the reaction causes: N2 (g) + 3 H2 (g)
a- decreases products
b- increases products
c- the reaction ceases
d- none of the above
d- 44.8 L
2 NH3 (g)
48- A sample of a gas occupies (30 mL) at standard temperature and pressure (STP).
What will be the temperature when the volume increases to (60 mL) and the pressure
to (2280 mmHg)?
a- 1638ºC
b- 1968ºC
c- 1638K
d- 45.5ºC
49- The equilibrium constant in terms of rate constants for the forward reaction, kf, and
the reverse reaction, kr, is given as
k
k
b- K = kf + kr
d- K = kf kr
a- K = r
c- K = f
kf
kr
50- For the reaction: 2A (g)
B (g) at equilibrium, the PA = 0.60 atm and PB = 0.60
atm and the total pressure is Ptot = 1.2 atm. What is the PA when the total pressure
increased to 1.5 atm?
a- 0.67 atm
b- 0.81 atm
c- 0.75 atm
d- 0.91 atm
51- The IUPAC name for the following compound is:
C2H5CH=CHCH3
a. pentane
c. 3-pentyne
b. 2-pentene
d. 3-pentenol
52- The IUPAC name for the following compound is:
a. 3-heptene
b. 3-heptane
d. 4-heptyne
c. 3-heptyne
53- Which one of the following compounds is an alkane?
a. C3H6
b. C3H4 c. C2H6 d. C2H4 e. C2H2
54- What is the generalized formula for an alkene?
a. CnHn-2
b. C2nHn
c. CnH2n
d. CnHn+2
e. CnH2n+2
55-Classify the following molecule according to its functional group.
a. alcohol
b. aldehyde
c. carboxylic acid
d. ester
e. ether
57-Classify the following molecule according to its functional group.
a. Alcohol
b. aldehydes
c. alkanes
d. carboxylic acid
e. ester
58- When two amino acids joined together, which form of bond formed?
a. ionic bond
b. hydrogen bond
c. peptide bond
d. metalic bond
59-The total number of amino acids is:
a. 20
b. 19
c40
d. 21
60- The IUPAC name for the following compound is:
a. 3-methyl butane
b. 2- methyl butane
c. pentane
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d. 2- methyl butene