Chapter 7 – Quantum Theory of the Atom
1. What is the wavelength of a photon having a frequency of 64.6 THz? (1 THz = 1015 Hz,
c = 3.00 m/s, h = 6.63 10–34 J s)
A)
0.215 nm
B)
4.28 10–23 nm
C)
1.28 10–14 nm
D)
4.64 nm
E)
4.64 1015 nm
2. Which of the following is/are true about electromagnetic radiation?
1.
Wavelength is inversely proportional to frequency.
2.
Frequency has units of s-1 or Hz.
3.
Waves of different wavelengths travel at different speeds in a vacuum.
A)
1 only
B)
2 only
C)
3 only
D)
1 and 2
E)
1, 2, and 3
3. What is the wavelength of a photon having a frequency of
4.50 1014
Hz?
(, )
A)
667 nm
B)
1.50 10−3
nm
C)
4.42 10−31
nm
D)
0.0895 nm
E)
2.98 10−10
nm
4. What is the frequency of a photon having a wavelength of 954.9 nm? ( ,
)
A)
3.14 10–4 Hz
B)
1.44 1027 Hz
C)
3.14 1014 Hz
D)
2.08 10–37 Hz
E)
2.08 10–19 Hz
5. Which of the following statements is incorrect?
A)
As the energy of a photon increases, its frequency decreases.
B)
As the wavelength of a photon increases, its energy decreases.
C)
The product of wavelength and frequency of electromagnetic radiation is a
constant.
D)
As the wavelength of a photon increases, its frequency decreases.
E)
As the frequency of a photon increases, its wavelength decreases.
6. Which type of electromagnetic radiation has the shortest wavelength?
A)
red light
B)
x rays
C)
microwaves
D)
gamma rays
E)
blue light
7. Which type of electromagnetic radiation has the highest frequency?
A)
microwaves
B)
visible
C)
radio waves
D)
infrared
E)
ultraviolet
8. Rank the following regions of the electromagnetic spectrum in order of decreasing
frequency.
X rays, Microwaves, Infrared, Ultraviolet
A)
infrared, microwaves, ultraviolet, x rays
B)
x rays, microwaves, infrared, ultraviolet
C)
microwaves, infrared, ultraviolet, x rays
D)
microwaves, ultraviolet, infrared, x rays
E)
x rays, ultraviolet, infrared, microwaves
9. A photon of red light has a ____ frequency and a ____ wavelength than a photon of blue
light.
A)
lower, longer
B)
higher, shorter
C)
lower, shorter
D)
higher, longer
E)
lower, lower
10. Based on the photoelectric effect, Einstein proposed the idea that
A)
the energy of a single particle or photon of light is inversely proportional to its
frequency.
B)
the wavelength of light is inversely proportional to its frequency.
C)
particles can show characteristics of waves under certain experimental conditions.
D)
the energy of an object is proportional to its mass.
E)
light has particle-like properties.
11. When a particular metal is illuminated with photons, one electron is observed for each
absorbed photon. What effect would decreasing the wavelength and number of photons have
on the electrons leaving the surface?
A)
There would be more electrons leaving the surface.
B)
They would have higher kinetic energy.
C)
The electron velocity would be lower.
D)
The kinetic energy of the electrons would be lower.
E)
Two photons might be required to eject the electrons.
Test Bank General Chemistry, 10th edition 4
12. A laser emits photons having an energy of 3.74 10–19 J. What color would be expected for
the light emitted by this laser? (c = 3.00 m/s, h = 6.63 10–34 J s)
A)
yellow to orange
B)
orange to red
C)
green
D)
violet
E)
blue
13. A light emitting diode (L.E.D.) emits photons with an energy of
3.221 10−19
J. What is the
energy per mole of photons emitted?
A)
1.939 105
J/mol
B)
5.348 10−46
J/mol
C)
1.939 108
J/mol
D)
3.221 10−19
J/mol
E)
5.348 10−40
J/mol
14. Which type of electromagnetic radiation has the highest energy?
A)
radio waves
B)
x rays
C)
red light
D)
blue light
E)
gamma rays
15. What is the energy of a photon of electromagnetic radiation with a wavelength of 877.4 nm?
()
A)
2.27 10−19
J
B)
5.82 10−40
J
C)
2.27 10−28
J
D)
3.42 1014
J
E)
1.94 10−39
J
16. What is the energy of a photon of electromagnetic radiation with a frequency of
3.84 1014
Hz? ( )
A)
1.15 1023
J
B)
7.64 10−11
J
C)
5.18 10−40
J
D)
7.81 10−7
J
E)
2.55 10−19
J
17. What is the wavelength of a photon that has an energy of
2.36 10−16
J?
()
A)
2.36 10−7
nm
B)
3.56 1017
nm
C)
0.843 nm
D)
7.08 101
nm
E)
4.69 10−32
nm
18. What is the frequency of a photon having an energy of
()
A)
B)
C)
D)
E)
19. What is the wavelength of photons that have molar energy of 479 kJ/mol?
()
A)
B)
C)
D)
E)
20. What is the frequency of photons that have molar energy of 525 kJ/mol?
()
A)
B)
C)
D)
E)
21. What is the energy per mole of photons with a wavelength of 976.9 nm?
()
A)
B)
C)
D)
E)
22. What is the energy per mole of photons having a frequency of
()
A)
B)
C)
D)
E)
23. Which of the following scientists first postulated that the sharp lines in the emission spectra
of elements were caused by electrons going from high-energy levels to low-energy levels?
A)
Rutherford
B)
Pauli
C)
Hund
D)
de Broglie
E)
Bohr
24. Which of the following is/are correct postulates of Bohr’s theory of the hydrogen atom ?
1.
The energy of an electron in an atom is quantized (i.e. only specific energy
values are possible).
2.
The principal quantum number (n), specifies each unique energy level.
3.
An electron transition from a lower energy level to a higher energy level
results in an emission of a photon of light.
A)
1 only
B)
2 only
C)
3 only
D)
1 and 2
E)
1, 2, and 3
Test Bank General Chemistry, 10th edition 8
25. Whose postulates account for the line spectrum of an atom?
A)
Thomson
B)
de Broglie
C)
Heisenberg
D)
Rutherford
E)
Bohr
26. Who postulated that energy is radiated only when an electron falls from a higher-energy
level to a lower-energy level?
A)
Bohr
B)
Heisenberg
C)
Rutherford
D)
Einstein
E)
Millikan
27. In Bohr’s atomic theory, when an electron moves from one energy level to another energy
level more distant from the nucleus,
A)
energy is absorbed.
B)
light is emitted.
C)
energy is emitted.
D)
no change in energy occurs.
E)
none of these
28. When an electron in an atom makes a transition from n = 6 to n = 4, which of the following
statements is/are correct?
I.
Energy is emitted.
II.
Energy is absorbed.
III.
The electron loses energy.
IV.
The electron gains energy.
V.
The electron cannot make this transition.
Test Bank General Chemistry, 10th edition 9
A)
I and III
B)
I and IV
C)
II and IV
D)
II and III
E)
III
29. From the Bohr model of the hydrogen atom, we can conclude that the energy required to
excite an electron from n = 5 to n = 6 is ____ the energy required to excite an electron from
n = 4 to 5.
A)
less than
B)
greater than
C)
equal to
D)
either equal to or less than
E)
either equal to or greater than
30. What is the wavelength of light emitted when the electron in a hydrogen atom undergoes a
transition from level (
)
A)
B)
C)
D)
E)
31. What is the frequency of light emitted when the electron in a hydrogen atom undergoes a
transition from level (
)
A)
B)
C)
D)
E)
32. The electron in a hydrogen atom, originally in level , undergoes a transition to a lower
level by emitting a photon of wavelength 1006 nm. What is the final level of the electron?
(
A)
3
B)
4
C)
7
D)
8
E)
1
33. Consider the following energy-level diagram for a particular electron in an atom.
Based on this diagram, which of the following statements is incorrect?
A)
The wavelength of a photon emitted by the electron jumping from level 2 to level 1
is given by .
B)
If the electron is in level 1, it may jump to level 2 by absorbing a photon with
energy of E.
C)
If the electron is in level 1, it may jump to level 2 by absorbing any photon having
energy of at least E.
D)
We would observe an electron jumping from level 2 to level 1 as a single line in a
line spectrum.
E)
If the electron is in level 2, it may jump to level 1 by emitting a photon with energy
of |E|.
34. The contribution for which de Broglie is best remembered in modern science is
A)
his statement that no electron can have identical values for all four quantum
numbers.
B)
his proposal that particles of matter should be associated with wavelike behavior.
C)
his statement that an electron can exist in an atom only in discrete energy levels.
D)
his statement that elements show periodic repetition of properties.
E)
his statement that electrons occupy all the orbitals of a given sublevel singly before
pairing begins.
35. Which of the following statements concerning quantum mechanics is/are true?
1.
The behavior of submicroscopic particles can sometimes be described as
waves.
2.
Quantum mechanics limits us to making statistical statements about the
location of an electron in an atom.
3.
The uncertainty principle is important only for particles of very small mass,
such as the electron.
A)
1 only
B)
2 only
C)
3 only
D)
2 and 3
E)
1, 2, and 3
36. What is the wavelength of a 149-g baseball traveling at 97.2 mph?
()
A)
B)
C)
D)
E)