Chemistry Chapter 7
What is the value for the angular momentum quantum number for the electron in a 5d orbital
2
What is the energy of a photon of electromagnetic radiation with a wavelength of 877.4 nm?
2.27 x 10⁻¹⁹J
What is the energy of a photon of electromagnetic radiation with a frequency of 3.84 x 10¹⁴ Hz?
2.55 x 10⁻¹⁹J
What is the wavelength of photons that have molar energy of 479 kJ/mol?
250 nm
The number of orbitals having a given value of L is equal to
2L+1
How many p orbitals are there in the n=4 shell
3
The electron in a hydrogen atom, originally in level n=7, undergoes a transition to a lower level by emitting a photon of wavelength 1005 nm. What is the final level of the electron?
3
The number of orbitals in a p subshell is
3
Which of the following sets of quantum numbers (n,l,m1,ms) refers to a 3d orbital?
3, 2, 1, -1/2
Which of the following sets of quantum numbers is not permissible
3, 3, -3, +1/2
What is the frequency of a photon having a wavelength of 954.9 nm?
3.14 x 10¹⁴ Hz
What is the wavelength of an electron traveling at 7.59% of the speed of light
3.20 x 10⁻¹¹m
An orbital with the quantum numbers n=3, L=1, M₁= -1 may be found in which subtle?
3d
Which of the following subshell does not exist
3f
Which hydrogen atom orbital has an energy essentially identical to a 3d orbital?
3p
What is the frequency of light emitted when the electron in a hydrogen atom undergoes a transition from level n=6 to level n=5?
4.01 x 10¹³Hz
What is the wavelength of a photon having a frequency of 64.6 THz?
4.64nm
Which orbital or orbitals is/are specified by the set of quantum numbers n=4 and l=3
4f
How many orbitals have the set of quantum numbers n=4 and l=2
5
If the location of a particular electron can be measured only to a precision of 0.011nm, what is the minimum uncertainty in the electron's velocity?
5.3 x 10⁶ m/s
What is the wavelength of a photon having a frequency of 4.50 x 10¹⁴ Hz?
667 nm
How many values are there for the magnetic quantum number when the value of the angular momentum quantum number is 4?
9
What is the wavelength of light emitted when the electron in a hydrogen atom undergoes a transition from level n=6 to level n=1?
9.39 x 10⁻⁸m
Which of the following is a representation of a 3dxz orbital?
A
Which of the following is a representation of a 3dx²-y² orbital?
A
What is the energy per mole of photons with a wavelength of 976.9nm?
1.23 x 10² kJ/mol
What is the frequency of photons that have molar energy of 525 kJ/mol?
1.31 x 10¹⁵ Hz
What is the energy per mole of photons having a frequency of 3.96 x 10¹⁴Hz?
1.58 x 10² kJ/mol
A light emitting diode (L.E.D) emits photons with an energy of 3.221 x 10 ⁻¹⁹ J. What is the energy per mole of photons emitted?
1.939 x 10⁵ J/mol
What is the total number of orbitals found in the n=4 shell?
16
Which type of electromagnetic radiation has the highest energy?
gamma rays
Which type of electromagnetic radiation has the shortest wavelength?
gamma rays
What is the value of the principal quantum number for an electron in a 1s orbital?
1
What is the wavelength of a photon that has an energy of 2.36 x 10⁻¹⁶J
0.843nm
A possible value for the magnetic quantum number m1 for a 5p electron is
1
What is the frequency of a photon having an energy of 7.75 x 10⁻¹⁶J?
1.17 x 10¹⁸Hz
A radial probability plot for an electron in an atom, like that shown below,
Gives the probability of finding the electron at a given radius from the nucleus
The square of a wave function, ¥², of an electron in an atom
Gives the probability of finding the electron in a region of space
A laser emits photons having an energy of 3.74 x 10⁻¹⁹ J. What color would be expected for the light emitted by this laser?
Green
The contribution for which de Broglie is best remembered in modern science is
His proposal that particles of matter should be associated with wavelike behavior
A photon of red light has a __ frequency and a __ wavelength than a photon of blue light
lower, longer
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 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
1 & 2
When an electron in an atom makes a transition from n=6 to n=4, which of the following statements is/are correct? 1. Energy is emitted 2. Energy is absorbed 3. The electron loses energy 4. The electron gains energy 5. The electron cannot make this transition
1 & 3
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
1 and 2
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
1,2, and 3
If the x-component of the velocity of an electron can be measured only to a precision of 5.7 x 10⁻² m/s, what is the minimum uncertainty of the position of the electron in the x-direction?
1.0 x 10⁻³m
What is the wavelength of a 149-g baseball traveling at 97.2 mph?
1.02 x 10⁻³⁴m
Which of the following statements is incorrect
As the energy of a photon increases, its frequency decreases
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?
Bohr
Who postulated that energy is radiated only when an electron falls from a higher-energy level to a lower-energy level?
Bohr
Whose postulates account for the line spectrum of an atom?
Bohr
Consider the following energy-level diagram for a particular electron in an atom. Based on this diagram, which of the following statements is incorrect?
If the electron is in level 1, it may jump to level 2 by absorbing any photon having energy of at least ∆E
Which quantum number distinguishes the different shapes of the oribitals
L
All of the following statements about the quantum number are true except
L may take integral values from 1 to n-1
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 n=5
Less than
Which of the following statements is a valid conclusion from the Heisenberg uncertainty principle?
The act of measuring a particle's position changes its momentum, and vice versa
Which of the following statements is incorrect?
The set of quantum numbers n=3, l=2, m₁=0, ms= -1/2 is not permitted because m₁=0
Which of the following statements is incorrect concerning the wave function?
The value of the wave function gives the location of the particle
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?
They would have higher kinetic energy
What is the value of the spin quantum number for an electron in a 3p orbital?
either +1/2 or - 1/2
In Bohr's atomic theory, when an electron moves from one energy level to another energy level more distant from the nucleus,
energy is absorbed
Based on the photoelectric effect, Einstein proposed the idea that
light has particle-like properties
Which of the following combinations of quantum numbers is permissible?
n=3, l=2, m₁=1, ms= +1/2
The angular momentum quantum number is best associated with the
shape of the orbital
Which of the following statements is incorrect?
the n=2 shell has 5 d orbitals
Which type of electromagnetic radiation has the highest frequency?
ultraviolet
Rank the following regions of electromagnetic spectrum in order of decreasing frequency: x rays, infrared, microwaves and ultraviolet
x rays, ultraviolet, infrared, microwaves
