Chem 141 Exam 3 2025 Questions and
Answers
Electromagnetic spectrum - --CORRECT ANSWER--full spectrum of light;
includes the light we cannot see
Wavelength - --CORRECT ANSWER--the distance between successive crests in a
wave (meters)
Frequency - --CORRECT ANSWER--number of wavelengths in a second; inverse
of the period, units (s-1 or Hz)
Period - --CORRECT ANSWER--time for one wavelength
Amplitude - --CORRECT ANSWER--the height of the wave relative to its "line" it
is oscillating about (meters)
wave interference - --CORRECT ANSWER--when two waves meet while traveling
in the same medium (constructive- amplitudes perfectly overlap; destructive-
amplitudes perfectly cancel)
Photon - --CORRECT ANSWER--the discrete energy packets light comes in
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, Line spectra - --CORRECT ANSWER--if you isolate atoms in the gas phase, you
find that they radiate very specific bands of color; a chart of graph showing the
intensity of light over a range of colors or "wavelengths"
Emission - --CORRECT ANSWER--when an electron moves to a lower orbital
(n=3 to n=2); a photon is emitted, potential energy is lowered
Absorption - --CORRECT ANSWER--when an electron moves to a higher orbital
(n=2 to n=3); a photon is absorbed, potential energy is increased
Wave-particle duality - --CORRECT ANSWER--electrons can behave as both
particles and waves
Quantum numbers - --CORRECT ANSWER--n (principle quantum number), l
(angular momentum quantum number), ml (magnetic quantum number), s
(electron spin)
Principle quantum number - --CORRECT ANSWER--n (equal to an integer),
specifies the orbital shell (think hydrogen atom shells)
Angular momentum quantum number - --CORRECT ANSWER--l (n-1 to 0),
specifies the orbital shape (s vs. p); s=0, p=1, d=2, f=3
Magnetic moment quantum number - --CORRECT ANSWER--ml (all integer
values between negative l and positive l), specifies the orbital orientation (a distinct
orbital for a given orbital shape), tells us the number of orbitals
Electron spin - --CORRECT ANSWER--s, up or down, +½ or -½
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Answers
Electromagnetic spectrum - --CORRECT ANSWER--full spectrum of light;
includes the light we cannot see
Wavelength - --CORRECT ANSWER--the distance between successive crests in a
wave (meters)
Frequency - --CORRECT ANSWER--number of wavelengths in a second; inverse
of the period, units (s-1 or Hz)
Period - --CORRECT ANSWER--time for one wavelength
Amplitude - --CORRECT ANSWER--the height of the wave relative to its "line" it
is oscillating about (meters)
wave interference - --CORRECT ANSWER--when two waves meet while traveling
in the same medium (constructive- amplitudes perfectly overlap; destructive-
amplitudes perfectly cancel)
Photon - --CORRECT ANSWER--the discrete energy packets light comes in
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
, Line spectra - --CORRECT ANSWER--if you isolate atoms in the gas phase, you
find that they radiate very specific bands of color; a chart of graph showing the
intensity of light over a range of colors or "wavelengths"
Emission - --CORRECT ANSWER--when an electron moves to a lower orbital
(n=3 to n=2); a photon is emitted, potential energy is lowered
Absorption - --CORRECT ANSWER--when an electron moves to a higher orbital
(n=2 to n=3); a photon is absorbed, potential energy is increased
Wave-particle duality - --CORRECT ANSWER--electrons can behave as both
particles and waves
Quantum numbers - --CORRECT ANSWER--n (principle quantum number), l
(angular momentum quantum number), ml (magnetic quantum number), s
(electron spin)
Principle quantum number - --CORRECT ANSWER--n (equal to an integer),
specifies the orbital shell (think hydrogen atom shells)
Angular momentum quantum number - --CORRECT ANSWER--l (n-1 to 0),
specifies the orbital shape (s vs. p); s=0, p=1, d=2, f=3
Magnetic moment quantum number - --CORRECT ANSWER--ml (all integer
values between negative l and positive l), specifies the orbital orientation (a distinct
orbital for a given orbital shape), tells us the number of orbitals
Electron spin - --CORRECT ANSWER--s, up or down, +½ or -½
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
