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