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College Thermodynamics
Which of the following represents an increase in positional entropy?
  1. 2CO(g)+O2(g)→2CO2(g)
  2. 2C2H6(g)+7O2(g)→4CO2(g)+6H2O(g)
  3. N2(g)+O2(g)→2NO(g)
  4. None of the above
College Thermodynamics
Which of the following represents the standard free energy of formation?
  1. Change in free energy present at 1 atm
  2. Change in free energy that accompanies the formation of 1 mole from constituent elements
  3. Change in free energy present at 273 K
  4. Both (a) and (c)
College Quantum Physics and the Atom
Which of the following represents stability in bonds on a plot of potential energy vs. distance?
  1. The highest amount of energy
  2. The greatest amount of repulsion
  3. The lowest amount of energy
  4. Both (b) and (c)
College Quantum Physics and the Atom
Which of the following is true about ionic compounds, according to Coulomb's Law?
  1. Ionic compounds formed by ions with smaller charges form stronger bonds
  2. Ionic compounds formed with longer bond lengths have stronger bonds
  3. Ionic compounds formed by ions with larger charges and longer bond lengths leads to stronger bonds
  4. Ionic compounds formed by ions with larger charges form stronger bonds
College Quantum Physics and the Atom
Which of the following represents the relationship between the charges and the force between the charged particles?
  1. They are inversely proportional to one another
  2. They are directly proportional to one another
  3. One of the charges is directly proportional to the force
  4. None of the above
College Quantum Physics and the Atom
How many d orbitals exist?
  1. 2.5
  2. 5
  3. 10
  4. 3
College Quantum Physics and the Atom
Where do p orbitals lie?
  1. on the x-axis, only
  2. on the y-axis, only
  3. on the x-axis, y-axis, and z-axis
  4. on the z-axis, only
College Quantum Physics and the Atom
Which of the following equations represents energy that can be used in problems involving specific energy transitions?
  1. E=(-2.178×10-18J)(Z2n2)
  2. ∆E=hmv
  3. ∆E=nhv
  4. ∆E=hf
College Quantum Physics and the Atom
Which of the following defines an orbital?
  1. The surface containing 80% of the total electron probability
  2. The surface containing 76% of the total electron probability
  3. The surface containing 90% of the total electron probability
  4. The surface containing 50% of the total electron probability
College Quantum Physics and the Atom
Which of the following equations can be used to calculate the wavelength of an emitted photon?
  1. λ=∆Ehc
  2. λ=∆E×hc
  3. λ=hc∆E
  4. λ=∆E×ch
College Quantum Physics and the Atom
Calculate ∆E when the following transition occurs in a hydrogen atom: n=4→n=2.
  1. -1.36×10-19J
  2. -4.084×10-19J
  3. -5.45×10-19J
  4. 4.084×10-19J
College Thermodynamics
Which of the following equations correctly characterizes the equation used in the Second Law of Thermodynamics?
  1. ∆Suniv=∆Ssys-∆Ssurr
  2. ∆Suniv=∆Ssys∆Ssurr
  3. ∆Suniv=∆Ssys•∆Ssurr
  4. ∆Suniv=∆Ssys+∆Ssurr
College Thermodynamics
Which of the following equations correctly describes a system that is at equilibrium?
  1. ∆G<0 and K=Q
  2. ∆G>0 and K=Q
  3. ∆G=0, only
  4. ∆G=0 and K=Q
College Quantum Physics and the Atom
Which of the following represents how the charges affect the forces?
  1. Charges of the same sign lead to attractive forces
  2. Charges with opposite signs lead to repulsive forces
  3. Charges with the same sign lead to repulsive forces
  4. Both (a) and (b)
College Quantum Physics and the Atom
What can be determined using photoelectronic spectroscopy?
  1. Activation energy
  2. Energy needed to retain the photon on the surface
  3. Energy needed to eject electrons from the material
  4. None of the above
College Quantum Physics and the Atom
Electrons move in circular orbits, as stated by the Bohr Model.
  1. True
  2. False
College Quantum Physics and the Atom
Which of the following equations correctly relates the different factors considered on the electromagnetic spectrum?
  1. E=hcλ
  2. E=hvλ
  3. E=hvc
  4. E=hcλ
College Quantum Physics and the Atom
What is the wavelength of an emitted photon, if the associated energy change is 4.84×10-19J?
  1. 2.43×106m
  2. 2.43×107m
  3. 1.215×106m
  4. 1.216×107m
College Thermodynamics
Which of the following reactions correctly demonstrates an increase in positional entropy?
  1. 2H2(g)+O2(g)→2H2O(l)
  2. N2(g)+O2(g)→2NO(g)
  3. N2O4(g)→2NO2(g)
  4. None of the above
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