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# College Thermodynamics Questions

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College Thermodynamics
Which of the following correctly describes the Second Law of Thermodynamics?
1. The universe is constantly decreasing in disorder
2. The entropy in the universe is equal to zero
3. The universe is constantly increasing in disorder
4. None of the above
College Thermodynamics
Which of the following can be used to calculate entropy changes in reactions?
1. $∆Gº_{reaction}=∑n_{r}∆Gº_f{"reactants"}-∑n_{p}∆Gº_f{"products"}$
2. $∆Gº_{reaction}=∑n_{r}∆Gº_f{"reactants"}+∑n_{p}∆Gº_f{"products"}$
3. $∆Gº_{reaction}=∑n_{p}∆Gº_f{"products"}-∑n_{r}∆Gº_f{"reactants"}$
4. None of the above
College Thermodynamics
College Thermodynamics
Which of the following correctly represents when the equilibrium point occurs?
1. When the value of ∆Gº=1, only
2. When the value of ∆Gº<0, only
3. When the value of ∆Gº>0, only
4. At the lowest value of free energy available to the system
College Thermodynamics
Which of the following correctly describes an increase in entropy?
1. freezing
2. crystallization of a solution
3. dissolving
4. condensation
College Thermodynamics
Which of the following represents ∆Gº, in terms of temperature?
1. $∆Gº=∆Hº+T∆Sº$
2. $∆Gº=∆Hº-T∆Sº$
3. $∆Gº=∆Hº-T/{∆Sº}$
4. $∆Gº=-∆Hº-T∆Sº$
College Thermodynamics
Which of the following correctly classifies entropy?
1. It is an intensive property, in that it depends on the identity of the substance
2. It is an extensive property, in that it depends on the number of moles
3. It is neither extensive nor intensive
4. It is an extensive property, in that it depends on the identity of the substance
College Thermodynamics
Which of the following always result as products of the combustion of fossil fuels?
1. carbon dioxide and oxygen
2. carbon, oxygen, and water
3. carbon dioxide and water
4. hydrocarbons, only
College Thermodynamics
College Thermodynamics
Which of the following equations correctly characterizes the equation used in the Second Law of Thermodynamics?
1. $∆S_{univ}=∆S_{sys} - ∆S_[surr}$
2. $∆S_{univ}={∆S_{sys}}/{∆S_[surr}}$
3. $∆S_{univ}=∆S_{sys} • ∆S_[surr}$
4. $∆S_{univ}=∆S_{sys} + ∆S_[surr}$
College Thermodynamics
Which of the following reactions correctly demonstrates an increase in positional entropy?
1. $2H_2 (g) + O_2 (g) rarr 2H_2O(l)$
2. $N_2(g) + O_2(g) rarr 2NO(g)$
3. $N_2O_4(g) rarr 2NO_2(g)$
4. None of the above
College Thermodynamics
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
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 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 an increase in positional entropy?
1. $2CO(g) + O_2(g) rarr 2CO_2(g)$
2. $2C_2H_6(g) + 7O_2(g) rarr 4CO_2(g) + 6H_2O(g)$
3. $N_2(g) + O_2(g) rarr 2NO(g)$
4. None of the above
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
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