ACS QM PHYSICAL CHEMISTRY14
What is the order of the electromagnetic spectrum from high to low energy? -
ANSWERSGamma rays, x-rays, UV, visible, IR, microwaves, radio
What transitions occur in the microwave spectrum? - ANSWERSRotational
What transitions occur in the IR spectrum? - ANSWERSVibrational with accompanying rotational
fine structure bands
What transitions occur in the UV-vis spectrum? - ANSWERSElectronic
In quantum mechanics, energy levels exist as multiples of what number? - ANSWERSPlanck's
constant, h
What is the ultra-violet catastrophe? - ANSWERSThe classical mechanics equation for frequency
distribution predicts that heating an object should create blackbody radiation of gamma rays of
infinite intensity.
How was the ultra-violet catastrophe solved? - ANSWERSIt was assumed that energy exists in
discrete units as multiples of Planck's constant, h.
What does classical mechanics predict about the photoelectric effect? - ANSWERSBoth the
number of electrons emitted from a material and their energy should be proportional to
intensity of the incident light beam
What does quantum mechanics reveal about the photoelectric effect? - ANSWERSEnergy is
proportional to frequency, and number of emitted electrons is proportional to intensity.
, What types of energy do single atoms lack? - ANSWERSrotational and vibrational
How does increasing bond strength affect vibrational energy? - ANSWERSIt increases it
What is the order of gaps between energy levels? - ANSWERSFrom greatest to least, electronic,
vibrational, rotational, nuclear spin.
What do electronic transitions depend upon? - ANSWERSElectron kinetic energy, coulombic
attractions and repulsions, and magnetic interactions
What is rotational energy dependent upon? - ANSWERSGeometry
What are the four claims of the Bohr Model? - ANSWERSi. Electrons orbit nuclei
ii. atoms exist as integer energy levels
iii. energy of a transition is equal to h(photon frequency)
iv. allowed orbits are given in integer multiples of h/(2pi)
What does the wavefunction contain? - ANSWERSInformation on an object's location and
momentum
What are the requirements for a wave function? - ANSWERSIt must be finite, continuous, single
valued, normalizable
What does integrating the square of the wavefunction give? - ANSWERSThe probability of
finding a particle over the integrated space
What is the position operator? - ANSWERSMultiply by x
What is the order of the electromagnetic spectrum from high to low energy? -
ANSWERSGamma rays, x-rays, UV, visible, IR, microwaves, radio
What transitions occur in the microwave spectrum? - ANSWERSRotational
What transitions occur in the IR spectrum? - ANSWERSVibrational with accompanying rotational
fine structure bands
What transitions occur in the UV-vis spectrum? - ANSWERSElectronic
In quantum mechanics, energy levels exist as multiples of what number? - ANSWERSPlanck's
constant, h
What is the ultra-violet catastrophe? - ANSWERSThe classical mechanics equation for frequency
distribution predicts that heating an object should create blackbody radiation of gamma rays of
infinite intensity.
How was the ultra-violet catastrophe solved? - ANSWERSIt was assumed that energy exists in
discrete units as multiples of Planck's constant, h.
What does classical mechanics predict about the photoelectric effect? - ANSWERSBoth the
number of electrons emitted from a material and their energy should be proportional to
intensity of the incident light beam
What does quantum mechanics reveal about the photoelectric effect? - ANSWERSEnergy is
proportional to frequency, and number of emitted electrons is proportional to intensity.
, What types of energy do single atoms lack? - ANSWERSrotational and vibrational
How does increasing bond strength affect vibrational energy? - ANSWERSIt increases it
What is the order of gaps between energy levels? - ANSWERSFrom greatest to least, electronic,
vibrational, rotational, nuclear spin.
What do electronic transitions depend upon? - ANSWERSElectron kinetic energy, coulombic
attractions and repulsions, and magnetic interactions
What is rotational energy dependent upon? - ANSWERSGeometry
What are the four claims of the Bohr Model? - ANSWERSi. Electrons orbit nuclei
ii. atoms exist as integer energy levels
iii. energy of a transition is equal to h(photon frequency)
iv. allowed orbits are given in integer multiples of h/(2pi)
What does the wavefunction contain? - ANSWERSInformation on an object's location and
momentum
What are the requirements for a wave function? - ANSWERSIt must be finite, continuous, single
valued, normalizable
What does integrating the square of the wavefunction give? - ANSWERSThe probability of
finding a particle over the integrated space
What is the position operator? - ANSWERSMultiply by x
