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Chem 345 Review
Chem 345 Review
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1
Consider the MO diagram of CN
-
. What is the bond order of CN radical?
1.5
2
1
2.5
2
The deBroglie formula relates…
The wavelength of a particle to it's position
The wavelength of a particle to its color
the wavelength of a particle to its momentum
The wavelength of a particle to it's size
3
For a hydrogen atom with a principle quantum number of n=2, how many total nodes are there?
1
3
0
2
4
What orbital has the quantum numbers (4,2,0)?
A 3f orbital
A 4f orbital
A 4d orbital
A 3d orbital
5
For a wave which is an eigenfunction of the momentum operator, the uncertainty in position is
Cannot be known exactly
hbar / 2
Infinite
The energy times two m
6
The Born-Oppenheimer approximation states that
The number of electronic transitions < number of nuclear transitions
Nuclei move much faster than electrons
A and B
Electrons transition between states faster than the nucleii keep up
7
If a function solves the time independent schrodinger equation…
We call that function an eigenvalue
The particle does not change with time.
The particle in inside of the box
The wavefunction is normalized
8
The J quantum number for a rigid rotator
Determines the angular momentum of the rotation
All of the above
Is related to the total angular momentum
Determines the current energy level of the rotation
9
In the H
2
+
molecule, why don’t we see a linear combination between the 1s and 2s orbitals?
They are not symmetrical
It is forbidden.
They are too different in energy
The nodes cancel the bonding/antibonding interaction
10
Electron A and Electron B walk into a bar and sit down in the same chair. What can we say about the spin of electron A?
Electrons can't walk.
Electron A is spin up
The spin of electron A is up if electron B is down.
The spin of electron A cannot be known, as there is no electron A.
11
Which of the following was early evidence for quantum theory
Heisenberg uncertainty principle
Rayleigh Scattering
Dr. Bjorkland's velocity as he walks
Blackbody radiation
12
If you increase the length of a bond, You decrease the…
Likelihood of Dr. Brandt allowing you to make nitrogen triiodide.
B tilde (rotational constant)
mu (reduced mass)
I (moment of inertia)
13
If two operators commute…
We can know both of the uncertainties in their observables
The commutator for the operators is equal to hbar
The eigenvalues for the two operators are the same
We can know the values of both of their observables at the same time
14
For the particle in a box model, as the box gets bigger
The energy levels begin to repel each other
The particle becomes imbued with the will to live.
The energy levels get closer together
The energy levels get further apart
15
The angular part of a hydrogen atom wavefunction is called a
Harmonical Sphere
Sarmonical Hphere
Spherical Harmonic
Monpherical Sardonic
16
Which of the following does the position of a peak in the IR NOT depend on?
The equilibrium bond length
The reduced mass
The force constant
17
Which term is not in the Hamiltonian for the Helium atom
Electron Kinetic Energy
Electron - Electron Repulsion
Electron - Nuclear attraction
Nuclear - Nuclear Repulsion
18
As you go up in energy, the energy levels in a morse oscillator …
something something iodine.
become further apart.
always have the same energy spacing.
become closer together.
19
Selection rules for IR absorption transitions state that
The v quantum number can only change by +/- 1
Undertones > fundamentals.
The molecule must have an inversion center
Overtones are allowed transitions of the harmonic oscillator
20
The total spin quantum number (s) of a beta electron is
-1/2
+1/2
sqrt(1/2)
0
21
As you go up in energy, the energy levels in a harmonic oscillator …
force you to question your place in society.
become further apart.
become closer together.
always have the same energy spacing.
22
The force constant k in the harmonic oscillator model describes
The mass of the particles
The strength of the bond
The anharmonicity of the bond
The reduced mass of the particles
23
If a molecule moves an electron anti-bonding -> bonding, would you see a franck condon progression?
No
Yes
24
Starting from the J=2 vibrational level, which of the following is a forbidden rotational transition for a diatomic?
J: 3->3
J: 3->2
J: 2->3
These are all allowed transitions.
25
When making linear combinations of atomic orbitals, what determines if it is an antibonding orbital.
If it is the highest energy orbital
If it has a node perpendicular to the bond axis.
Vibes.
If it has a node along the bond axis
26
A state with 3 unpaired electrons is called a
Quartet
Triplet
Doublet
Singlet
27
The visible lines of the hydrogen emission spectrum
B and C
Correspond to leaps between distinct energy levels
Are evidence for hydrogen bonding
Always end at n=2
28
The variational principle can be used to find…
The Hardest question Dr. Peterson has ever asked you
The approximate energy of the helium atom ground state
Wavefunctions of excited states of molecules
Energies of excited states of molecules
29
Is the human body gerade, ungerade, or neither?
ungerade
neither
gerade
30
In the term symbol 3D1, what does the D mean?
The spin of all the electrons is 1.
The electrons have an total orbital angular momentum quantum number of 2.
They are 3-dimensional electrons.
The electrons are in a D orbital
31
What does the m_l quantum number determine?
The number of transitions between the excited and ground state
The orientation of the orbital
The x-component of orbital angular momentum
The spin of the orbital
32
The ground state of benzene is about E=-863 hartree. Which of the following might variational theory predict?
E_var = -862 hartree
E_var = -864 hartree
E_var = -899 hartree
E_var = -902 hartree
33
For a hydrogen atom wavefunction quantum number l=2, how many angular nodes are there?
2
1
3
0
34
Which photon has the most energy?
Frequency = 1 Hz
Wavenumber = 1 cm-1
E = 1eV
Wavelength = 1 nm
35
The Pauli Exclusion principle states that…
Two electrons cannot have all the same quantum numbers
Two electrons cannot occupy the same orbital
Two electrons must be symmetric with respect to exchange
Dr. Sanders will exclude you from her class if you pipet by mouth
36
The moment of inertia for a gas molecule is determined by
The masses of the atoms and the length of the bonds
The center of mass and the center of gravity
The number of deuterium atoms contained in the molecule
The force constant for the bond and the reduced mass of the electrons
37
The P branch in ro-vibrational spectra corresponds to…
v' = v''+1; J' = J''+1.
v' = v''-1; J' = J''-1.
v' = v''-1; J' = J''+1.
v' = v''+1; J' = J''-1.
38
If the l quantum number is 3, what is the L^2 eigenvalue?
hbar^2*(3)
hbar^2*(3*4)
hbar and grill
hbar^2*(3*3)
39
In electronic transitions, which is the most important selection rule?
The spin of the molecule is unchanged
You cannot move more than one electron at a time
It is forbidden to put orange juice in Dr. J's electronic HPLC pumps.
You must transition g>u or u>g
