Matching
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Match each item with the correct statement below. a. | atomic emission spectrum | d. | photon | b. | frequency | e. | quantum | c. | wavelength | f. | spectrum |
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1.
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discrete bundle of electromagnetic energy
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2.
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energy needed to move an electron from one energy level to another
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3.
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number of wave cycles passing a point per unit of time
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4.
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distance between wave crests
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5.
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separation of light into different wavelengths
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6.
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frequencies of light emitted by an element
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Multiple Choice Identify the
choice that best completes the statement or answers the question.
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7.
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In the Bohr model of the atom, an electron in an orbit has a fixed ____.
a. | position | c. | energy | b. | color | d. | size |
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8.
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The shape (not the size) of an electron cloud is determined by the
electron's ____.
a. | energy sublevel | c. | speed | b. | position | d. | principal quantum
number |
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9.
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The letter " p" in the symbol 4 p indicates
the ____.
a. | spin of an electron | c. | principle energy level | b. | orbital
shape | d. | speed of an
electron |
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10.
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What is the electron configuration of potassium?
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11.
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How many unpaired electrons are in a sulfur atom (atomic number 16)?
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12.
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What is the wavelength of an electromagnetic wave that travels at 3
10 m/s and has a frequency of 60 MHz? (1 MHz = 1,000,000 Hz)
a. | | b. | 60 MHz ´
300,000,000 m/s | c. | | d. | No answer can be determined from the
information given. |
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13.
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The light given off by an electric discharge through sodium vapor is
____.
a. | a continuous spectrum | c. | of a single wavelength | b. | an emission
spectrum | d. | white
light |
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14.
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Emission of light from an atom occurs when an electron ____.
a. | drops from a higher to a lower energy level | b. | jumps from a lower
to a higher energy level | c. | moves within its atomic
orbital | d. | falls into the nucleus |
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15.
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As changes in energy levels of electrons increase, the frequencies of atomic
line spectra they emit ____.
a. | increase | c. | remain the same | b. | decrease | d. | cannot be
determined |
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16.
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The atomic emission spectra of a sodium atom on Earth and of a sodium atom in
the sun would be ____.
a. | the same | b. | different from each other | c. | the same as those of
several other elements | d. | the same as each other only in the ultraviolet
range |
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17.
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What is the approximate energy of a photon having a frequency of 4
10 Hz? ( h = 6.6 10 J s)
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18.
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What is the approximate frequency of a photon having an energy 5 10 J? ( h = 6.6 10 J s)
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19.
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Which of the following quantum leaps would be associated with the greatest
energy of emitted light?
a. | n = 5 to n = 1 | c. | n = 2 to n = 5 | b. | n = 4 to n = 5 | d. | n = 5 to n = 4 |
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20.
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Which variable is directly proportional to frequency?
a. | wavelength | c. | position | b. | velocity | d. | energy |
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21.
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How do the energy differences between the higher energy levels of an atom
compare with the energy differences between the lower energy levels of the atom?
a. | They are greater in magnitude than those between lower energy
levels. | b. | They are smaller in magnitude than those between lower energy
levels. | c. | There is no significant difference in the magnitudes of these
differences. | d. | No answer can be determined from the information
given. |
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22.
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What are quanta of light called?
a. | charms | c. | muons | b. | excitons | d. | photons |
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23.
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Which scientist developed the quantum mechanical model of the atom?
a. | Albert Einstein | c. | Niels Bohr | b. | Erwin Schrodinger | d. | Ernest
Rutherford |
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24.
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Bohr's model could only explain the spectra of which type of atoms?
a. | single atoms with one electron | b. | bonded atoms with one
electron | c. | single atoms with more than one electron | d. | bonded atoms with
more than one electron |
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25.
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The quantum mechanical model of the atom ____.
a. | defines the exact path of an electron around the nucleus | b. | was proposed by
Niels Bohr | c. | involves the probability of finding an electron in a certain
position | d. | has many analogies in the visible world |
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26.
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Who predicted that all matter can behave as waves as well as particles?
a. | Albert Einstein | c. | Max Planck | b. | Erwin Schrodinger | d. | Louis de
Broglie |
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27.
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According to the Heisenberg uncertainty principle, if the position of a moving
particle is known, what other quantity CANNOT be known?
a. | mass | c. | spin | b. | charge | d. | velocity |
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28.
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How can the position of a particle be determined?
a. | by analyzing its interactions with another particle | b. | by measuring its
velocity | c. | by measuring its mass | d. | by determining its
charge |
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29.
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The wavelike properties of electrons are useful in ____.
a. | defining photons | b. | writing electron
configurations | c. | magnifying objects | d. | determining the velocity and position of a
particle |
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30.
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In an s orbital, the probability of finding an electron a particular
distance from the nucleus does NOT depend on ____.
a. | a quantum mechanical model | c. | the Schrodinger
equation | b. | direction with respect to the nucleus | d. | the electron energy
sublevel |
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