Question 1

All of the following statements are false for the freezing of water at 273 K EXCEPT

Accepted Answer

A)  ΔH  0. 
C)  ΔH = 0. 
D)  ΔS = 0. 
E)  ΔS > 0. 
A)  ΔH  0. 
C)  ΔH = 0. 
D)  ΔS = 0. 
E)  ΔS > 0.

Question 2

Which of the following linear chain alcohols is likely to have the largest standard molar entropy in the liquid state?

Accepted Answer

A)  CH3OH 
B)  CH3CH2OH 
C)  CH3CH2CH2OH 
D)  CH3CH2CH2CH2OH 
E)  CH3CH2CH2CH2CH2OH 
A)  CH3OH 
B)  CH3CH2OH 
C)  CH3CH2CH2OH 
D)  CH3CH2CH2CH2OH 
E)  CH3CH2CH2CH2CH2OH

Question 3

All of the following statements are true EXCEPT

Accepted Answer

A)  for a given material,the gas has greater entropy than the solid. 
B)  the entropy for gaseous elements is zero at 298 K. 
C)  at 0 K,an ordered pure crystalline solid has an entropy of zero. 
D)  for a given material,the liquid has greater entropy than the solid. 
E)  increasing the temperature of a substance increases its entropy. 
A)  for a given material,the gas has greater entropy than the solid. 
B)  the entropy for gaseous elements is zero at 298 K. 
C)  at 0 K,an ordered pure crystalline solid has an entropy of zero. 
D)  for a given material,the liquid has greater entropy than the solid. 
E)  increasing the temperature of a substance increases its entropy.

Question 4

All of the following statements are true EXCEPT

Accepted Answer

A)  a reaction is spontaneous if ΔG  0,then a reaction is not spontaneous. 
E)  ΔG is referred to as Gibbs free energy. 
A)  a reaction is spontaneous if ΔG  0,then a reaction is not spontaneous. 
E)  ΔG is referred to as Gibbs free energy.

Question 5

Nitric oxide can be made from the reaction of oxygen and nitrogen gases. O2(g)+ N2(g)→ 2NO(g)
If ΔG° = 165.5 kJ,and ΔH° = 180.4 kJ,what is ΔS° at 325°C?

Accepted Answer

A)  0.0125 kJ/K 
B)  0.0249 kJ/K 
C)  0.0458 kJ/K 
D)  0.142 kJ/K 
E)  1.02 kJ/K 
A)  0.0125 kJ/K 
B)  0.0249 kJ/K 
C)  0.0458 kJ/K 
D)  0.142 kJ/K 
E)  1.02 kJ/K

Question 6

The second law of thermodynamics states that

Accepted Answer

A)  in a spontaneous process,there is a net increase in entropy,taking into account both the system and the surroundings. 
B)  there is no disorder in a perfect crystal at 0 K. 
C)  the total energy of the universe is always increasing. 
D)  the total energy of the universe is constant. 
E)  mass and energy are conserved in all chemical reactions. 
A)  in a spontaneous process,there is a net increase in entropy,taking into account both the system and the surroundings. 
B)  there is no disorder in a perfect crystal at 0 K. 
C)  the total energy of the universe is always increasing. 
D)  the total energy of the universe is constant. 
E)  mass and energy are conserved in all chemical reactions.

Question 7

For a chemical reaction,ΔG and ΔG° are equal

Accepted Answer

A)  when products and reactants are in standard state concentrations. 
B)  when K = 0. 
C)  when K > 1. 
D)  for a system at equilibrium. 
E)  when the entropy change is zero. 
A)  when products and reactants are in standard state concentrations. 
B)  when K = 0. 
C)  when K > 1. 
D)  for a system at equilibrium. 
E)  when the entropy change is zero.

Question 8

Predict the sign of ΔS and ΔH for the combustion of gasoline at 500 K.

Accepted Answer

A) ΔH > 0 and ΔS > 0 B) ΔH > 0 and ΔS = 0 C) ΔH 0 D) ΔH < 0 and ΔS < 0 E) ΔH < 0 and ΔS = 0 A) ΔH > 0 and ΔS > 0 B) ΔH > 0 and ΔS = 0 C) ΔH 0 D) ΔH < 0 and ΔS < 0 E) ΔH < 0 and ΔS = 0

Question 9

When ammonium nitrate dissolves spontaneously in water the temperature of the solution decreases.Which statement is true for this system?

Accepted Answer

A) ΔH 0 D) ΔH > 0 and ΔS > 0 E) ΔH > 0 and ΔS < 0 A) ΔH 0 D) ΔH > 0 and ΔS > 0 E) ΔH > 0 and ΔS < 0

All of the following statements are false for the freezing of water at 273 K EXCEPT

Which of the following linear chain alcohols is likely to have the largest standard molar entropy in the liquid state?

All of the following statements are true EXCEPT

All of the following statements are true EXCEPT

Nitric oxide can be made from the reaction of oxygen and nitrogen gases. O₂(g)+ N₂(g)→ 2NO(g) If ΔG° = 165.5 kJ,and ΔH° = 180.4 kJ,what is ΔS° at 325°C?

The second law of thermodynamics states that

For a chemical reaction,ΔG and ΔG° are equal

Predict the sign of ΔS and ΔH for the combustion of gasoline at 500 K.

When ammonium nitrate dissolves spontaneously in water the temperature of the solution decreases.Which statement is true for this system?

Matter and Measurements

Atoms, molecules, and Ions

Mass Relations in Chemistry;stoichiometry

Reactions in Aqueous Solution

Gases

Electronic Structure and the Periodic Table

Covalent Bonding

Thermochemistry

Liquids and Solids

Solutions

Rate of Reaction

Gaseous Chemical Equilibrium

Acids and Bases

Equilibria in Acid-Base Solutions

Complex Ion and Precipitation Equilibria

Electrochemistry

Nuclear Reactions

Complex Ions

Chemistry of the Metals

Chemistry of the Nonmetals

Organic Chemistry

Organic Polymers, natural and Synthetic

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Exam 16: Spontaneity of Reaction

All of the following statements are false for the freezing of water at 273 K EXCEPT

Which of the following linear chain alcohols is likely to have the largest standard molar entropy in the liquid state?

All of the following statements are true EXCEPT

All of the following statements are true EXCEPT

Nitric oxide can be made from the reaction of oxygen and nitrogen gases. O2(g)+ N2(g)→ 2NO(g) If ΔG° = 165.5 kJ,and ΔH° = 180.4 kJ,what is ΔS° at 325°C?

The second law of thermodynamics states that

For a chemical reaction,ΔG and ΔG° are equal

Predict the sign of ΔS and ΔH for the combustion of gasoline at 500 K.

When ammonium nitrate dissolves spontaneously in water the temperature of the solution decreases.Which statement is true for this system?

Matter and Measurements

Atoms, molecules, and Ions

Mass Relations in Chemistry;stoichiometry

Reactions in Aqueous Solution

Gases

Electronic Structure and the Periodic Table

Covalent Bonding

Thermochemistry

Liquids and Solids

Solutions

Rate of Reaction

Gaseous Chemical Equilibrium

Acids and Bases

Equilibria in Acid-Base Solutions

Complex Ion and Precipitation Equilibria

Electrochemistry

Nuclear Reactions

Complex Ions

Chemistry of the Metals

Chemistry of the Nonmetals

Organic Chemistry

Organic Polymers, natural and Synthetic

Filters

Nitric oxide can be made from the reaction of oxygen and nitrogen gases. O₂(g)+ N₂(g)→ 2NO(g) If ΔG° = 165.5 kJ,and ΔH° = 180.4 kJ,what is ΔS° at 325°C?