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Thermodynamics Questions - All Grades

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College Thermodynamics
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 Thermodynamics
Which of the following equations correctly characterizes the equation used in the Second Law of Thermodynamics?
  1. Suniv=Ssys-Ssurr
  2. Suniv=SsysSsurr
  3. Suniv=SsysSsurr
  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 Thermodynamics
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
College Thermodynamics
College Thermodynamics
Which of the following factors dominates changes in positional entropy for particles in a reaction, when gaseous reactants and products are involved?
  1. The temperature of the particles
  2. The volume of the particles
  3. The physical states of the particles themselves
  4. The numbers of gaseous reactants and products
College Thermodynamics
Which of the following accounts for the entropy value of a perfect crystal at 0 K?
  1. All of the particles are arranged in a regular pattern
  2. All of the particles are arranged in a perfect position in the lattice structure
  3. All of the particles move past one another with minimal entropy
  4. All of the particles are evenly dispersed
College Thermodynamics
Which of the following represents changes in directionality, when ∆Gº decreases?
  1. The reaction shifts to the left
  2. The reaction does not change
  3. The reaction's directionality depends on the actual value of ∆Gº
  4. The reaction slowly shifts to the right
College Thermodynamics
How does the boiling point of octane compare to that of butane, and why?
  1. It has a lower boiling point, because it has stronger intermolecular forces
  2. It has a lower boiling point, because it has weaker intermolecular forces
  3. It has a higher boiling point, because it has stronger intermolecular forces
  4. It has a higher boiling point, because it has weaker intermolecular forces
College Thermodynamics
Which of the following are present in petroleum?
  1. carbon, only
  2. hydrocarbons
  3. hydrogen, only
  4. carbon, hydrogen, and oxygen
College Thermodynamics
Which of the following is an example of a spontaneous process?
  1. The melting of an ice cube, when it is in contact with a body of water at 75ºC
  2. The conversion of kinetic energy into gravitational potential energy
  3. The condensation of liquid particles
  4. The freezing of liquid nitrogen
College Thermodynamics
Which of the following correctly defines ∆Gº?
  1. Change in free energy in converting reactants to products
  2. Change in free energy in converting reactants in the standard state to products in the standard state
  3. Change in energy in converting reactants to products
  4. None of the above
College Thermodynamics
College Thermodynamics
Which values of ∆H and T∆S could imply a spontaneous reaction?
  1. ∆H>0 and T∆S<0
  2. ∆H<0 and T∆S<0
  3. ∆H<0 and T∆S>0
  4. ∆H>0 and T∆S>0
College Thermodynamics
Which of the following represents a disadvantage of ∆Gº?
  1. ∆Gº can never be measured
  2. ∆Gº can only be measured when ∆Hº=0
  3. ∆Gº can only be measured when ∆Hº<0
  4. ∆Gº cannot be measured directly
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