
Chapter 12 quiz
Quiz
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Chemistry
•
University
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Practice Problem
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Hard
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Zi Yang
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8 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
According to the second law of thermodynamics, the change in the entropy of the universe (ΔS_univ) during a spontaneous reaction is
zero.
negative.
positive.
less than the change in entropy of the system (ΔS_sys).
greater than the change in entropy of the system (ΔS_sys).
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Which of the relationships between the free energy change of a system and associated entropy changes is true?
ΔG_sys = +TΔS_sys
ΔG_sys = -TΔS_sys
ΔG_sys = +TΔS_univ
ΔG_sys = -TΔS_univ
ΔG_sys = -TΔS_surr
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Which of the following is the best definition of a microstate as it pertains to entropy on the molecular level?
the state (solid, liquid, or gas) of a small cluster of atoms or molecules
a property of a small cluster of atoms and molecules, such as temperature, that is independent of how the property was achieved
the set of vibrational, rotational, and translational energy levels in a system
a unique specification of the vibrational, rotational, and translational states of a single molecule in a system
a unique specification of the vibrational, rotational, and translational states of all the particles in a system
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
When the volume of a gas is increased, the energy separation between microstates
increases.
decreases.
remains unchanged.
becomes infinite.
disappears.
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The enthalpy of fusion for benzene, C6H6, is 127.34 kJ/kg, and its melting point is 5.49°C. Estimate ΔG° when 1.00 mole of benzene melts at 25.00°C.
-8.31 kJ
-0.696 kJ
-11.3 kJ
-0.831 kJ
117 kJ
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
For the dimerization of nitrogen dioxide to form dinitrogen tetroxide (N2O4) according to the reaction 2 NO2(g) ⇌ N2O4(g), the value of ΔH° is -57.2 kJ/mol, and that of ΔS° is -175.8 J/mol·K. Estimate ΔG° at 100.00°C.
+6.6 kJ/mol
-3.9 kJ/mol
-122.8 kJ/mol
-74.8 kJ/mol
+8.4 kJ/mol
Tags
NGSS.HS-PS1-4
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The enthalpy and entropy of vaporization of ammonia at its normal boiling point, –33.34°C, are 23.35 kJ/mol and 97.4 J/mol·K, respectively. What is the entropy change of the universe when one mole of liquid ammonia vaporizes in a large room maintained at 34.0°C? Assume the final temperature of the ammonia gas is –33.34°C.
+21.4 J/K
+76.0 J/K
+74.1 J/K
–21.4 J/K
+76.0 J/K
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