Chemistry: Matter and Change

Chapter 5: Electrons in Atoms

Chapter Test Practice

1
The wavelength of a wave is measured from

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A)crest to crest
B)crest to trough
C)origin to crest
D)origin to trough
2
What is the energy of a single photon of light from hydrogen's 656 nm emission? Use h=6.626 x 10-34 Js and c=3.00 x 108 m/s.

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A)1.30 x 10-31 J
B)1.45 x 10-48 J
C)3.30 x 1018 J
D)3.03 x 10-19 J
3
Which of the following electromagnetic waves has photons of the highest energy?

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A)microwaves
B)infrared
C)x-rays
D)ultraviolet
4
What is the maximum number of electrons that can be present in each principal energy level of hydrogen?

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A)n
B)n2
C)2n
D)2n2
5
The concept that all moving particles have wave characteristics is attributed to ___________.
A)de Broglie
B)Thomson
C)Heisenberg
D)Bohr
6
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In the figure above, why must the photon's wavelength increase after the collision?
A)The photon changes direction.
B)The photon changes speed.
C)The photon gives up some energy to the electron.
D)The photon starts spinning.
7
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In the figure above, why are there dots beyond the "boundary" of the atomic orbital?
A)the boundary encloses the volume in which the electron is found 90% of the time
B)the boundary is three-dimensional, while the picture shows only two dimensions
C)experimental error
D)the boundary encloses the volume in which the electron is found 50% of the time
8
What is an electron dot structure?
A)An element symbol surrounded by dots representing its valence electrons.
B)An element symbol surrounded by its innermost electrons.
C)An element symbol with a positive charge.
D)A filled noble gas in brackets plus the remaining electron configuration expressed by filled orbitals.
9
Why does the 4s orbital begin to fill before the 3d orbital?

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A)The 4s orbital is lower than the 3d orbital in the aufbau diagram.
B)s orbitals always fill before d orbitals.
C)The 4s orbital is to the left of the 3d orbital in the diagram.
D)The 4s orbital has higher energy than the 3d orbital.
10
Which of the following statements expresses Hund's rule?

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A)Electrons in orbitals must possess opposite spins.
B)Single electrons with the same spin must occupy each equal-energy orbital before additional electrons with opposite spins can occupy the same orbitals.
C)Electrons with the same spin fill all orbitals.
D)P orbitals may contain up to six electrons.
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