CEM 141 EXAM 2 2026 CHEMICAL BONDING
AND REACTIONS REVIEW QUESTIONS
ANSWERS VERIFIED GUIDE
◉ Wavelength =
Answer: Distance from peak to peak.
◉ Frequency =
Answer: Number of wavelengths per sec.
◉ Amplitude
Answer: Height of a wave.
◉ Energy increases as =
Answer: Frequency increases and wavelength decreases.
◉ Photoelectric Effect
Answer: The emission of electrons from a metal when light shines
on the metal.
◉ Why does adding energy in the form of light (EM radiation) allow
electrons to "escape?"
,Answer: The photoelectric effect.
◉ What happens when short wavelength/high energy light shines
on a metal surface?
Answer: Electrons are emitted.
◉ Is there a threshold frequency below which no electrons are
emitted?
Answer: Yes.
◉ Below the threshold frequency, increasing the intensity has =
Answer: No effect.
◉ What did Einstein say about the photoelectric effect?
Answer: Does not depend on the intensity, just on the frequency
(energy).
◉ Visible Spectrum
Answer: Light from the sun (white) that can be separated by a prism
(rainbow).
◉ Atomic Emission Spectrum
, Answer: Light from one particular element does not contain all the
colors of the spectrum.
◉ Hot gas through a prism =
Answer: Emission Spectrum.
◉ Cold gas threw a prism =
Answer: Absorption Spectrum.
◉ T/F: The spectrum of an element is the same whether that
element is on earth, sun, or a galaxy far away.
Answer: True.
◉ What did Bohr discover?
Answer: Electrons move in orbits around the nucleus at select
energy levels (quantum numbers).
◉ How did Bohr explain the emission and absorption spectrum?
Answer: Quantum numbers (n).
◉ Are energy levels orbits?
Answer: No.
AND REACTIONS REVIEW QUESTIONS
ANSWERS VERIFIED GUIDE
◉ Wavelength =
Answer: Distance from peak to peak.
◉ Frequency =
Answer: Number of wavelengths per sec.
◉ Amplitude
Answer: Height of a wave.
◉ Energy increases as =
Answer: Frequency increases and wavelength decreases.
◉ Photoelectric Effect
Answer: The emission of electrons from a metal when light shines
on the metal.
◉ Why does adding energy in the form of light (EM radiation) allow
electrons to "escape?"
,Answer: The photoelectric effect.
◉ What happens when short wavelength/high energy light shines
on a metal surface?
Answer: Electrons are emitted.
◉ Is there a threshold frequency below which no electrons are
emitted?
Answer: Yes.
◉ Below the threshold frequency, increasing the intensity has =
Answer: No effect.
◉ What did Einstein say about the photoelectric effect?
Answer: Does not depend on the intensity, just on the frequency
(energy).
◉ Visible Spectrum
Answer: Light from the sun (white) that can be separated by a prism
(rainbow).
◉ Atomic Emission Spectrum
, Answer: Light from one particular element does not contain all the
colors of the spectrum.
◉ Hot gas through a prism =
Answer: Emission Spectrum.
◉ Cold gas threw a prism =
Answer: Absorption Spectrum.
◉ T/F: The spectrum of an element is the same whether that
element is on earth, sun, or a galaxy far away.
Answer: True.
◉ What did Bohr discover?
Answer: Electrons move in orbits around the nucleus at select
energy levels (quantum numbers).
◉ How did Bohr explain the emission and absorption spectrum?
Answer: Quantum numbers (n).
◉ Are energy levels orbits?
Answer: No.
