Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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If 4.0 g of element A combine with 10. g of element B, then 12 g of element A
combine with ____ g of element B.
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2.
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If two or more compounds are composed of the same two elements, the ratio of the
masses of one element that combine with a fixed mass of the other element is a simple whole number.
This is a statement of the law of
a. | conservation of mass. | c. | multiple proportions. | b. | mass
action. | d. | definite
composition. |
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3.
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If 63.5 g of copper (Cu) combine with 16 g of oxygen (O) to form the compound
CuO, how many grams of oxygen will be needed to combine with the same amount of copper to form the
compound CuO2?
a. | 16 g | c. | 64 g | b. | 32 g | d. | 127 g |
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4.
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In a glass tube attached to a voltage source, electrical current passes from the
negative electrode, called the ____, to the other electrode.
a. | cathode | c. | electron | b. | anode | d. | millikan |
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5.
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The deflection of cathode rays in Thomson's experiments was evidence of the
____ nature of electrons.
a. | wave | c. | particle | b. | charged | d. | spinning |
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6.
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In Rutherford's experiments, alpha particles
a. | passed through a tube containing gas. | c. | collided with
electrons. | b. | were used to bombard a cathode plate. | d. | were used to bombard thin metal
foil. |
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7.
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Because a few alpha particles bounced back from the foil, Rutherford concluded
that they were
a. | striking electrons. | b. | indivisible. | c. | repelled by densely
packed regions of positive charge. | d. | magnetic. |
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8.
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A positively charged particle with mass 1.673 ´
10–24 g is a(n)
a. | proton. | c. | electron. | b. | neutron. | d. | positron. |
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9.
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A nuclear particle that has about the same mass as a proton, but with no
electrical charge, is called a(n)
a. | nuclide. | c. | electron. | b. | neutron. | d. | isotope. |
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10.
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The nucleus of an atom has all of the following characteristics except
that it
a. | is positively charged. | b. | is very dense. | c. | contains nearly all
of the atom's mass. | d. | contains nearly all of the atom's
volume. |
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11.
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Most of the volume of an atom is occupied by the
a. | nucleus. | c. | electrons. | b. | nuclides. | d. | protons. |
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12.
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Isotopes are atoms of the same element that have different
a. | principal chemical properties. | c. | numbers of
protons. | b. | masses. | d. | numbers of electrons. |
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13.
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The most common form of hydrogen has
a. | no neutrons. | c. | two neutrons. | b. | one neutron. | d. | three neutrons. |
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14.
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What is the mass number of deuterium?
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15.
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The nucleus of deuterium contains one proton and
a. | two neutrons. | c. | no neutrons. | b. | one neutron. | d. | two electrons. |
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16.
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All isotopes of hydrogen contain
a. | one neutron. | c. | one proton. | b. | two electrons. | d. | two nuclei. |
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17.
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All atoms of the same element have the same
a. | atomic mass. | c. | mass number. | b. | number of neutrons. | d. | atomic number. |
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18.
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The carbon-12 atom is assigned a relative mass of exactly
a. | 1 amu. | c. | 12 amu. | b. | 6 amu. | d. | 100 amu. |
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19.
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The average atomic mass of an element is the average of the atomic masses of
its
a. | naturally occurring isotopes. | c. | radioactive
isotopes. | b. | two most abundant isotopes. | d. | artificial isotopes. |
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20.
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Chlorine has atomic number 17 and mass number 35. It has
a. | 17 protons, 17 electrons, and 18 neutrons. | b. | 35 protons, 35
electrons, and 17 neutrons. | c. | 17 protons, 17 electrons, and 52
neutrons. | d. | 18 protons, 18 electrons, and 17 neutrons. |
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21.
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The number of atoms in 1 mol of carbon is
a. | 6.022 ´ 1022. | c. | 5.022 ´ 1022. | b. | 6.022 ´
1023. | d. | 5.022
´ 1023. |
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22.
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The number of atoms in a mole of any pure substance is called
a. | its atomic number. | c. | its mass number. | b. | Avogadro's constant. | d. | its gram-atomic
number. |
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23.
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Avogadro's number is
a. | the maximum number of electrons that all the energy levels can
accommodate. | b. | the number of protons and neutrons that can fit in the shells of the
nucleus. | c. | the number of particles in 1 mole of a pure substance. | d. | the number of
particles in exactly 1 gram of a pure substance. |
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24.
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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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25.
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The mass of 2.0 mol of oxygen atoms (atomic mass 16.00 amu) is
a. | 16 g. | c. | 48 g. | b. | 32 g. | d. | 64 g. |
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