Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.
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1.
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What is the correct symbol for
iron?
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2.
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A pure substance that is
composed of two or more different elements is
a. | a chemical
compound. | b. | a multi-element. | c. | an atom. | d. | a heterogeneous
mixture. | e. | a homogeneous mixture. | |
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3.
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All of the following are
examples of physical properties EXCEPT
a. | the density of neon
gas. | b. | the conductivity of copper wire. | c. | the boiling point of water. | d. | the frying of an
egg. | e. | the density of mercury metal. | |
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4.
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The density of acetic acid is
1.05 g/mL. What is the volume of 275 g of acetic acid?
a. | 3.46 x
10-3 mL | b. | 3.82 x 10-3
mL | c. | 2.62 x
102 mL | d. | 2.76 x 102
mL | e. | 2.89 x
102 mL | |
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5.
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You can identify a metal by
carefully determining its density. A 23.1 g piece of an unknown metal is 1.23 cm long, 2.11 cm wide,
and 1.00 cm thick. What is the identity of the element?
a. | nickel, 8.90 g/cm3 | b. | aluminum, 2.70 g/cm3 | c. | titanium, 4.54 g/cm3 | d. | zirconium, 6.51 g/cm3 | e. | chromium 7.20 g/cm3 | |
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6.
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The radius of a helium atom is
31 pm. What is the radius in meters?
a. | 3.1 x 10-14
m | b. | 3.1 x
10-12 m | c. | 3.1 x 10-11
m | d. | 3.1 x
10-9 m | e. | 3.1 x 10-8
m | |
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7.
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A rectangular box has
dimensions of 20.0 cm x 15.0 cm
x 8.00 cm. Calculate the volume of the box
in liters.
a. | 2.40 x
10-3 L | b. | 4.30 x 10-3
L | c. | 2.40 L | d. | 43.0 L | e. | 2.40 x
103 L | |
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8.
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At 25 °C, the density of
oxygen in air is 0.275 g/L. What volume will be occupied by 5.0 kg of oxygen?
a. | 1.4 L | b. | 5.5 L | c. | 22 L | d. | 1.4 x 103
L | e. | 1.8 x
104 L | |
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9.
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Express 5.00 x 10-2 m in standard notation
using the correct number of significant figures.
a. | 0.05 cm | b. | 50 mm | c. | 50.0 mm | d. | 500 m | e. | 500. m | |
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10.
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Gamma (γ) rays are
a. | positively charged
electrons. | b. | identical to electrons. | c. | helium nuclei. | d. | identical to canal
rays. | e. | high energy radiation. | |
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11.
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Tritium, a radioactive isotope
of hydrogen, is produced
a. | by decomposition of rain
water. | b. | by decomposition of deep aquifer water. | c. | by cathode rays. | d. | commercially for use in smoke
detectors. | e. | naturally in the upper atmosphere by cosmic
radiation. | |
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12.
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Silver has an atomic mass of
107.9 amu. If 51.84% of Ag exists as Ag-107 (106.9051 amu), what is the identity and the atomic mass
of the other isotope?
a. | Ag-108; 107.9
amu | b. | Ag-109; 109.0 amu | c. | Ag-109; 109.9 amu | d. | Ag-110; 109.9
amu | e. | Ag-110; 110.2 amu | |
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13.
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The density of lithium is 0.546
g/cm3. What volume is occupied by 3.66 x 1023 atoms of lithium?
a. | 2.30
cm3 | b. | 6.24 cm3 | c. | 6.94 cm3 | d. | 7.25
cm3 | e. | 7.73 cm3 | |
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14.
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Which element comprises over
three quarters of the Earth's atmosphere?
a. | oxygen | b. | nitrogen | c. | helium | d. | argon | e. | hydrogen | |
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15.
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Of the following elements,
which two are the most abundant in the Earth's crust: iron, hydrogen, silicon, calcium, uranium, and
oxygen?
a. | hydrogen and oxygen | b. | hydrogen and iron | c. | iron and calcium | d. | silicon and oxygen | e. | silicon and
uranium | |
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16.
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The smallest unit into which a
pure substance such as sugar or water can be divided, while still retaining its composition and
chemical properties is a(n) ________.
a. | atom | b. | molecule | c. | isotope | d. | mixture | e. | ion | |
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17.
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A bromide ion has ________
electrons.
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18.
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Which formula represents the
binary compound formed by strontium ions and phosphate ions?
a. | Sr2(PO4)3 | b. | SrPO4 | c. | Sr2P3 | d. | Sr3(PO4)2 | e. | SrP | |
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19.
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Sodium oxalate has the chemical
formula, Na2C2O4. Based on this information, the formula for
iron(III) oxalate is __________.
a. | FeC2O4 | b. | Fe(C2O4)2 | c. | Fe(C2O4)2 | d. | Fe2(C2O4)3 | e. | Fe3(C2O4)2 | |
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20.
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What is the correct formula for
aluminum sulfide?
a. | AlSO3 | b. | Al2(SO4)3 | c. | AlS | d. | Al3(SO3)2 | e. | Al2S3 | |
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21.
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Predict which ionic compound
has the highest melting point.
a. | NaCl | b. | AlN | c. | CsI | d. | MgBr2 | e. | KF | |
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22.
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The empirical formula of a
hydrocarbon with a molar mass of 78.11 g/mol is CH. What is the molecular formula?
a. | C6H6 | b. | C5H28 | c. | C5H2O | d. | C2H4 | e. | C8H18 | |
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23.
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How many oxygen atoms are there
in 1.50 mol of O2?
a. | 1.81 x 1024
atoms | b. | 2.89 x
1025 atoms | c. | 9.03 x 1023
atoms | d. | 5.78 x
1025 atoms | e. | 2.82 x 1022
atoms | |
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24.
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Nitrogen and oxygen form an
extensive series of oxides with the general formula NxOy. What is the empirical
formula for an oxide that contains 63.65% nitrogen?
a. | N2O | b. | NO | c. | NO2 | d. | N2O3 | e. | N2O5 | |
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25.
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A 2.000 g sample of
CoCl2·xH2O is dried in an oven. When the anhydrous salt is removed from
the oven, its mass is 1.565 g. What is the value of x?
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Essay
- note that these questions will not be graded by the computer, but
answers will be provided
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26.
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What is the difference between
the accuracy of measurements and the precision of measurements?
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27.
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Significant figures allow us to
estimate uncertainty in calculated values. In some circumstances, following significant figure rules
can lead to estimates of uncertainty that are too high or low. This is the case for the mathematical
expression below.
99 x 1.02 = 100.98
Following the rules governing significant figures in multiplication, the answer can be
rounded to 1.0 x
102. What is wrong with rounding the answer to two significant figures?
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28.
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In which ionic compound, NaBr
or KBr, is the force of attraction between anions and cations stronger?
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29.
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The numerical quantity of a
mole, 6.022 x
1023, is defined as the number of atoms in a specific mass of an element. What is the mass
and the identity of the element used to define one mole?
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