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CHEM 103 Practice Final
CHEM 103 Practice Final
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1
Choose the pair of names and formulas that do NOT match.
copper(II) nitrate: Cu(NO3)2
All of these are correct
copper(II) nitride: Cu3N2
copper(II) nitrite: Cu(NO2)2
2
The mass of one mole of carbon dioxide is:
44.01 g
32.00 g
28.01 g
384.4 g
3
How many calories are there in a 255 Calorie snack bar?
1 x103 cal
2.55 x105 cal
60.9 cal
1.07 x103 cal
4
When 4.50 moles of H
2
O form, how many moles of NO are also produced in the following: 4 NH
3
+ 5 O
2
→ 4 NO + 6 H
2
O
4.50 mol
3.00 mol
6.75 mol
1.50 mol
5
__ potassium iodide + __ lead(II) acetate → lead(II) iodide + __ potassium acetate
3, 2, 2, 1
2, 1, 1, 1
2, 1, 1, 2
1, 1, 2, 2
6
Which of the following statements about soda pop is FALSE?
Soda pop is a chemical mixture of mostly sugar, water and CO2.
The molecules important to fizzing are CO2 and water.
When a can is opened, the pressure release allows CO2 to form bubbles.
The CO2 is forced to mix with the water by the presence of sugars.
7
What is the charge on the ion formed by aluminum?
3+
3-
5-
13+
8
You have 10.0 g each of C, Pb, Cu and Ne. Which contains the largest number of moles?
Pb
Ne
C
Cu
9
Which statement accurately describes the purpose of experiments?
Experiments look for other observable predictions of a theory
Experiments can be replaced by a simple, logical reasoning of known facts
Experiments are designed to produce the results predicted by a theory
Experiments are designed to produce unexplainable results for investigation
10
The central atom in the chlorate anion, ClO
3
-
, is surrounded by
2 double bonds and 0 unshared pairs of electrons
3 bonding and 1 unshared pairs of electrons
2 bonding and 2 unshared pairs of electrons
1 bonding and 3 unshared pairs of electrons
11
Group 7 A elements are also called:
alkaline earth metals.
noble gases.
halogens.
alkali metals.
12
When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why?
Yes; forming a gas is proof a new compound is made
No; forming gas bubbles is a secondary chemical reaction, which is ignored
Yes; forming a gas is evidence of a chemical reaction
No; boiling water is a physical change
13
How many waffles can be made from 1 dozen eggs, if: 2 cups flours + 3 eggs + 1 tbs oil → 4 waffles
48
4
12
16
14
The correct decimal representation of 6.453 x10
3
is:
6.5 x103
6.453
6453
0.006453
15
Lewis theory predicts that the formula of a compound formed between bromine and aluminum is:
AlBr2
AlBr3
AlBr
Al2Br
16
A scientific law is:
the underlying reason for a scientific theory
a brief statement summarizing past observations and predicting new ones
a way of learning that emphasizes observation and experimentation
the same as a hypothesis
17
How many protons and electrons are present in O
2-
?
16 protons and 8 electrons
8 protons and 10 electrons
8 protons and 8 electrons
10 protons and 8 electrons
18
The size of an atom generally increases
up a group and from left to right across a period
up a group and from right to left across a period
down a group and from left to right across a period
down a group and from right to left across a period
19
A balloon occupies 0.439 L at 44 °C and 729 torr. What temperature reduces its volume to 378 mL (at constant pressure)?
38 °C
0 °C
273 °C
95 °C
20
Calculate the molar mass of calcium nitrate.
136.03 g/mol
132.10 g/mol
102.09 g/mol
164.10 g/mol
21
How many electrons are unpaired in the orbitals of a nitrogen atom?
5
3
14
9
22
What is the molecular geometry of SiH
4
?
linear
bent
tetrahedral
trigonal pyramidal
23
At STP, 12.69 g of a noble gas occupies 14.09 L. What is the identity of the noble gas? (R= 0.0821 (L·atm)/(mol·K))
Kr
He
Ar
Ne
24
Which type of energy is associated with motion?
potential
electrical
kinetic
chemical
25
Consider the reaction ( 2 W + 3 X → 3 Y + Z ). When 5 units of W and 6 units of X react, the limiting reactant is:
W
Y
X
Z
26
A balloon filled with 0.500 L of air at sea level. What is the volume at a depth that produces a pressure of 3.25 atm?
0.154 L
0.615 L
6.50 L
1.63 L
27
Which of the statements about light is TRUE?
Light travels through space at a speed of 3.00 x108 m/s
All of the above statements are true
A characteristic that determines the color of light is its wavelength
A packet of light energy is called a photon
28
When a nonmetal bonds with a nonmetal
a covalent bond is involved
all of the above
electrons are shared
a molecular compound forms
29
Of the elements below, ____ has a completely filled p-subshell.
Ar
Na
Al
P
30
Group 2A elements are also called:
halogens.
noble gases.
alkali metals.
alkaline earth metals.
31
Which of the following compounds is insoluble?
magnesium iodide
magnesium nitrate
magnesium phosphate
magnesium sulfate
32
Ions are formed when atoms
gain or lose electrons.
gain or lose protons.
All of these results in ion formation.
gain or lose neutrons.
33
The theoretical yield of a reaction is 42 g of product and the percent yield is 75%. What was the actual yield?
1.8 grams
5400 grams
32 grams
56 grams
34
How many total atoms are in the formula Al
2
(CO
3
)
3
?
9
8
12
14
35
__ nitrogen monoxide + __ carbon monoxide → __ nitrogen + __ carbon dioxide
2, 1, 1, 2
1, 1, 2, 2
2, 2, 1, 2
2, 2, 2, 1
36
Which of the following is NOT an example of matter?
a dust particle
heat from a burning candle
all of the options are examples of matter
a balloon full of helium
37
What is a major component of the air we breathe?
nitrogen
oxygen
smog
carbon dioxide
38
If the volume of a gas container at 32.0 °C changes from 1.55 L to 755 mL, what will the final temperature be?
149 °C
273 °C
353 °C
-124 °C
39
How many significant digits should be reported in the answer to the following calculation? (4.3 - 3.7) x 12.3
1
2
4
3
40
A balloon is filled to 3.00 L at a pressure of 2.50 atm under the ocean. What is the volume when it reaches the surface?
7.50 L
1.20 L
5.50 L
0.933 L
41
How many moles of water can be made from 2.2 moles of oxygen gas, if: 2 H
2
+ O
2
→ 2 H
2
O
1.1
3.3
4.4
2.2
42
Consider the reaction ( 2 A + 5 B → 4 C ). What is theoretical yield of
C
when 3 units of A and 10 units of B react?
6
8
3
4
43
Consider the reaction ( 2 Al + 3 Cl
2
→ 2 AlCl
3
). If you begin with 13.5 g of aluminum,
you need 53.2 g of Cl2 to produce 66.7 g of AlCl3
you need 26.6 g of Cl2 to produce 49.0 g of AlCl3
you need 11.8 g of Cl2 to produce 49.0 g of AlCl3
you need 23.6 g of Cl2 to produce 66.7 g of AlCl3
44
The wavelength of blue light is 0.00000045 m. Express this wavelength in scientific notation.
4.5 x106 m
4.5 x10-7 m
4.5 x10-6 m
4.5 x107 m
45
Which of the following elements has an atomic number of 4?
H
He
Be
C
46
How are wavelength and frequency of light related?
Wavelength is double the frequency
Wavelength increases as the frequency decreases
Wavelength increases as frequency increases
Wavelength is one-half of the frequency
47
What is the definition of a scientific theory?
a statement that summarizes past observations and predicts future ones
a method that emphasizes reason as the way to understand the world
a model that explains the underlying reasons for observations and laws
the equivalent of a scientific opinion which others may disagree with
48
The distance between adjacent wave crests is called:
wavelength
nu
trough
frequency
49
The distance between the two H atoms in water is 0.000000000172 m. Express this distance in scientific notation.
1.72 x1010 m
1.72 x10-9 m
1.72 x10-10 m
0.172 x10-10 m
50
Consider the Lewis structures for SO
3
, SO
3
2-
, and SO
4
2-
. Which of these exist as a set of resonance structures?
SO42- only
SO32- only
SO3 only
all of these show resonance
51
The principal quantum number (n):
specifies the number of electrons in an orbital
specifies the principal shell of the orbital
specifies the subshell of the orbital
specifies the 3-D shape of the orbital
52
All of the following can be considered physical properties EXCEPT
color
boiling point
flammability
density
53
"When filling orbitals of equal energy, electrons fill them singly first with parallel spins." This is known as:
Pauli exclusion principle
Hund's rule
Bohr's model
Ground state
54
( 3 Ca(NO
3
)
2
+ 2 Li
3
PO
4
→ 6 LiNO
3
+ Ca
3
(PO
4
)
2
). If 3.4 mol Ca(NO
3
)
2
and 2.4 mol Li
3
PO
4
react, the limiting reactant is:
Ca3(PO4)2
LiNO3
Li3PO4
Ca(NO3)2
55
Which of the following elements has only 12 protons?
Zn
C
Mg
O
56
In a cylinder with Rn (222 torr), N
2
(446 torr), and He, what is helium's pressure if total pressure is 771 torr?
549 torr
771 torr
668 torr
103 torr
57
A gas occupies 325 mL at 721 torr and 32 °C. If compressed to 286 mL and 901 torr, what is the new temperature?
35.2 °C
335 °C
62.4 °C
215 °C
58
How many grams of water can be made from 16.0 g of oxygen gas, if: 2 H
2
+ O
2
→ 2 H
2
O
36.0 g
18.0 g
16.0 g
9.0 g
59
What is the oxygen-to-hydrogen mass ratio for H
2
O
2
?
4
8
16
0.125
60
What is the formula for an ionic compound made of carbon and oxygen?
Carbon and oxygen do not form an ionic compound
CO3
CO
CO2
61
What type of energy is associated with the burning of gasoline?
electrical
potential
chemical
kinetic
62
The charge of a vanadium ion in the compound V
2
O
5
is:
10-
10+
5+
2+
63
Which form of electromagnetic radiation has the shortest wavelength?
Radio Waves
Gamma Rays
Microwaves
Infrared Radiation
64
A gas sample occupies 3.50 liters at 20. °C. What volume will this gas occupy at 100. °C?
0.224 L
2.75 L
17.5 L
4.46 L
65
A solid form of matter in which there is long range repeating order is called _____
rigid
crystalline
amorphous
fixed
66
Which of the following is NOT evidence that a chemical reaction has occurred?
solid formation when chemicals are mixed
all of the above
color change when chemicals are mixed
Emission of light when chemicals are mixed
67
Which of the following statements is FALSE?
The theoretical yield is the minimum amount of product that could be made
The limiting reactant is completely consumed in a chemical reaction
The actual yield is the amount of product actually produced from a reaction
\%Yield=\frac{Actual}{Theoretical}x100\%
68
How many moles of bromine gas are in 37.7 grams?
0.236
79.9
3.01 x103
0.472
69
What is the coefficient of hydrogen when the following is balanced? __ N
2
+ __ H
2
→ __ NH
3
3
2
4
1
70
Which of the following items is a chemical property?
the melting and boiling point of water
the odor of spearmint gum
the paint color on a new red Corvette
the tarnishing of a copper statue
71
What is the mass in grams of 5.40 moles of lithium?
6.94
3.25 x1024
37.5
1.29
72
Which of the following items is a pure substance?
ice
seawater
air
brass
73
Carbon is considered which of the following?
atomic element
molecular compound
ionic compound
molecular element
74
What is the electron geometry if you have 3 electron groups around the center atom?
linear
trigonal planar
trigonal bipyramidal
tetrahedral
75
Density is calculated by dividing its mass by its volume. If a balloon of gas is warmed, what happens to its density?
The gas density will decrease.
The gas density is independent of temperature.
The gas density will increase.
The gas density will remain the same.
76
How many core electrons are in a chlorine atom?
7
1
10
17
77
Which symbol should be used between two structures that represent resonance structures?
≡
→
⟷
⇌
78
What is the molecular geometry of SCl
2
?
tetrahedral
linear
bent
trigonal pyramidal
79
What is the oxygen-to-sulfur mass ratio of sulfur dioxide?
1.0
0.5
16
2.0
80
The correct number of significant figures in the number 9.080 x10
4
is:
ambiguous
3
5
4
81
An atom containing 7 protons, 8 neutrons, and 7 electrons
cannot exist.
is an ion.
is charge-neutral.
is an oxygen atom.
82
One mole of boron has a mass of ___ g.
5
9.012
6.022 x1023
10.811
83
What is the name of CoS?
cobalt(II) sulfide
cobalt sulfide
cobaltous sulfur
cobalt monosulfide
84
What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide?
HCl + KOH → H2O + KCl
2 H+ + 2 Cl- + K2+ + 2 OH- → H2O + K2+ + 2 Cl-
H+ + OH- → H2O
H+ + Cl- + K+ + OH- → H2O + K+ + Cl-
85
One mole of potassium sulfate contains:
3 moles of potassium
1 mole of potassium
2 moles of sulfur
4 moles of oxygen
86
Which statement about a hypothesis is TRUE?
It is a tentative interpretation or explanation.
It can be tested by experiments.
All of the statements are true.
It has the potential to be proven wrong.
87
The correct number of significant figures in the number 0.027090 is:
7
6
5
ambiguous
88
How would you classify raisin bran?
a mixture (heterogenous)
a pure substance (a compound)
a mixture (homogenous)
a pure substance (an element)
89
The level of the TOP thermometer should be reported as:
21.70 °C
22 °C
21 °C
21.7 °C
90
What best describes a brief statement that summarizes past observations and predicts new ones?
experiment
theory
scientific law
hypothesis
91
All of the following compounds are soluble in water EXCEPT
CaCl2
PbCl2
NH4Cl
FeCl3
92
Group 8A elements are also called:
alkaline earth metals.
alkali metals.
noble gases.
halogens.
93
The electron geometry and the molecular geometry of ammonia (NH
3
) are, respectively:
tetrahedral, bent
trigonal planar, bent
tetrahedral, trigonal pyramidal
tetrahedral, tetrahedral
94
Which of the following would be considered a theory?
Gasoline has a very strong odor.
Hot air rises.
Helium balloons float because helium is less dense than air.
Glass is fragile.
95
Which of the following statements about the mole is FALSE?
A mole of a monatomic element corresponds to one Avogadro's number of atoms
One mole of water contains 1/2 mole of oxygen atoms
The size of a mole of atoms has a reasonable mass
The mass of one mole of an element is equal to its atomic mass in grams
96
Determine the answer to the following equation with correct number of significant figures: 2.02 + 8.102 - 0.0297 =
10.09
10.1
10.092
10.0923
97
Identify the spectator ions: Pb(NO
3
)
2
(
aq
) + 2 KI (
aq
) → PbI
2
(
s
) + 2 KNO
3
(
aq
)
Pb2+ , NO3-
K+ , NO3-
K+ , I-
Pb2+ , I-
98
One mole of ammonium nitrate contains:
3 moles of hydrogen
2 moles of oxygen
2 moles of nitrogen
1 mole of nitrogen
99
In the number 48.93, which digit is estimated?
4
3
8
9
100
Carbon monoxide is considered which of the following?
atomic element
molecular element
ionic compound
molecular compound
101
Which of the following items does NOT contain chemicals?
All of these contain chemicals.
insecticides
organically grown vegetables
air
102
Consider two balloons, one containing 25 g of He, one containing 25 g of Ne. Which of the following statements is true?
The helium balloon has more atoms.
This scenario cannot happen because gases have no mass.
The neon balloon has more atoms.
The balloons have an equal number of atoms.
103
What is the atomic symbol for tin?
Si
Sn
Ti
Tn
104
What is the electron geometry if you have 4 electron groups around the center atom?
trigonal planar
trigonal bipyramidal
tetrahedral
linear
105
How would you classify salt water?
a pure substance (an element)
a pure substance (a compound)
a mixture (heterogenous)
a mixture (homogenous)
106
A 3.0-g sample of wood was burned in an open dish. The ashes weighed 1.2 g. What happened to the rest of the wood?
The remaining mass was destroyed.
Nothing, the burned wood simply has a mass of 1.2 grams.
The remaining 1.8 grams was converted into gaseous compounds.
The remaining 1.8 grams was converted into heat.
107
What is the coefficient of O
2
when the following is balanced? __ C
5
H
12
+ __ O
2
→ __ CO
2
+ __ H
2
O
8
3
5
4
108
The key to success in chemistry is:
curiosity
commitment
mathematical skills
all of these
109
Which formula shows the proper use of parentheses?
Ca(F)2
Ca(SO4)
Ca(NO3)2
(NH4)3(PO4)
110
The correct number of significant figures in the number 865000 is:
6
3
ambiguous
4
