Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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A true statement about mass is that
a. | mass if often measured with a spring scale. | b. | mass is expressed in
pounds. | c. | as the force of Earth's gravity on an object increases, the object's mass
increases. | d. | mass is determined by comparing the mass of an object with a set of standard masses
that are part of a balance. |
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2.
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Which of these statements about density is true?
a. | Larger objects are more dense. | b. | Density does not depend on
temperature. | c. | Density is a physical property. | d. | The density of an object depends on the force
of gravity. |
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3.
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Oxygen can combine with carbon to form two compounds, carbon monoxide and carbon
dioxide. The ratio of the masses of oxygen that combine with a given mass of carbon is 1:2. This is
an example of
a. | the law of conservation of mass. | c. | the law of conservation of
energy. | b. | Dalton's atomic theory. | d. | the law of multiple
proportions. |
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4.
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Protons within a nucleus are attracted to each other by
a. | the nuclear force. | c. | their energy levels. | b. | opposite charges. | d. | electron
repulsion. |
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5.
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Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils,
has
a. | 6 neutrons. | c. | 10 neutrons. | b. | 8 neutrons. | d. | 14 neutrons. |
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6.
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The mass of 1 mol of chromium (atomic mass 51.996 amu) is
a. | 12 g. | c. | 51.996 g. | b. | 198 g. | d. | 6.02 ´
1023 g. |
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7.
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If 8 electrons completely fill a main energy level, what is n?
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8.
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If the third main energy level contains 15 electrons, how many more could it
possibly hold?
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9.
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A single orbital in the 3d level can hold ____ electrons.
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10.
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Argon, krypton, and xenon are
a. | alkaline earth metals. | c. | actinides. | b. | noble gases. | d. | lanthanides. |
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11.
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In drawing a Lewis structure, each nonmetal atom except hydrogen should be
surrounded by
a. | 2 electrons. | c. | 8 electrons. | b. | 4 electrons. | d. | 10 electrons. |
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12.
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How many electrons must be shown in the Lewis structure of the hydroxide ion,
OH–?
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13.
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How many atoms of fluorine are present in a molecule of carbon tetrafluoride,
CF4?
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14.
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What is the percentage composition of CO?
a. | 50% C, 50% O | c. | 25% C, 75% O | b. | 12% C, 88% O | d. | 43% C, 57% O |
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15.
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Which word equation represents the reaction that produces water from hydrogen
and oxygen?
a. | Water is produced from hydrogen and oxygen. | b. | Hydrogen plus oxygen
yields water. | c. | H2 + O2 ®
water. | d. | Water can be separated into hydrogen and oxygen. |
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16.
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Which coefficients correctly balance the formula equation CaO + H2O
® Ca(OH)2?
a. | 2, 1, 2 | c. | 1, 2, 1 | b. | 1, 2, 3 | d. | 1, 1, 1 |
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17.
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The reaction represented by the equation 2Mg(s) + O2(g)
® 2MgO(s) is a
a. | synthesis reaction. | c. | single-displacement reaction. | b. | decomposition
reaction. | d. | double-displacement reaction. |
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Use the table below to answer the following questions.
| Element | Symbol | Atomic
Mass | | Bromine | Br | 79.90 | | Calcium | Ca | 40.08 | | Carbon | C | 12.01 | | Chlorine | Cl | 35.45 | | Cobalt | Co | 58.93 | | Copper | Cu | 63.55 | | Fluorine | F | 19.00 | | Hydrogen | H | 1.01 | | Iodine | I | 126.90 | | Iron | Fe | 55.85 | | Lead | Pb | 207.2 | | Magnesium | Mg | 24.30 | | Mercury | Hg | 200.59 | | Nitrogen | N | 14.01 | | Oxygen | O | 15.00 | | Potassium | K | 39.10 | | Sodium | Na | 22.99 | | Sulfur | S | 32.01 | | | |
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18.
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For the reaction represented by the equation 2H2 + O2
® 2H2O, how many grams of water are produced from 6.00 mol
of hydrogen?
a. | 2.00 g | c. | 54.0 g | b. | 6.00 g | d. | 108 g |
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19.
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Which causes the high density of solids?
a. | The particles are more massive than those in liquids. | b. | The intermolecular
forces between particles are weak. | c. | The particles are packed closely
together. | d. | The energy of the particles is very high. |
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20.
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Pressure is the force per unit
a. | volume. | c. | length. | b. | surface area. | d. | depth. |
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21.
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What is the SI unit of force?
a. | torr | c. | pound | b. | pascal | d. | newton |
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22.
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Convert the pressure 0.75 atm to mm Hg.
a. | 101.325 mm Hg | c. | 570 mm Hg | b. | 430 mm Hg | d. | 760 mm Hg |
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23.
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Convert the pressure 0.840 atm to mm Hg.
a. | 365 mm Hg | c. | 638 mm Hg | b. | 437 mm Hg | d. | 780 mm Hg |
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24.
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The volume of a gas is 93 mL when the temperature is 91°C. If the temperature is reduced to 0°C
without changing the pressure, what is the new volume of the gas?
a. | 70. mL | c. | 120 mL | b. | 93 mL | d. | 273 mL |
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25.
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The standard molar volume of a gas at STP is
a. | 22.4 L. | c. | g-mol wt/22.4 L. | b. | g/22.4 L. | d. | 1 L. |
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