Chem 116 Exam 3 questions with answers

Chem 116 Exam 3 questions with answers |\ |\ |\ |\ |\ |\




The first law of thermodynamics can be given as - CORRECT
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ANSWERS ✔✔DeltaE = q+w |\ |\ |\




A reaction that is spontaneous as written - CORRECT ANSWERS
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✔✔will proceed without outside intervention
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Of the following (S, H, q, E, T), only ___ is NOT a state function. -
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CORRECT ANSWERS ✔✔q |\ |\




When a system is at equilibrium - CORRECT ANSWERS ✔✔the
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process is not spontaneous in either direction
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A reversible process is one that - CORRECT ANSWERS ✔✔an be
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reversed with no net change in either system or surroundings.
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The thermodynamic quantity that expresses the degree of
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disorder in a system is - CORRECT ANSWERS ✔✔entropy
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For an isothermal process, DeltaS is - CORRECT ANSWERS
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✔✔qrev/T


Which one of the following is always positive when a
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spontaneous process occurs? - CORRECT ANSWERS |\ |\ |\ |\ |\ |\


✔✔DeltaSuniverse

,The entropy of the universe is - CORRECT ANSWERS
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✔✔continually increasing |\




The second law of thermodynamics states that - CORRECT
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ANSWERS ✔✔for any spontaneous process, the entropy of the
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universe increases |\




the normal boiling point of water is 100 C and it's molar enthalpy
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of vaporization is 40.67 kj/mol. What is the change in entropy in
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the system J/K when 39.3 grams of steam at 1 atm condenses to
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a liquid at the normal boiling point? - CORRECT ANSWERS ✔✔-
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238


DeltaS is positive for the reaction - CORRECT ANSWERS
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✔✔BaF2(s) -> Ba(aq) + 2F(aq) |\ |\ |\ |\




Which one of the following processes produces a decrease in the
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entropy of the system? - CORRECT ANSWERS ✔✔freezing water
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to form ice
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DeltaS is positive for the reaction - CORRECT ANSWERS
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✔✔2SO3(g) -> 2SO2(g) + O2(g) |\ |\ |\ |\




Which reaction produces a decrease in the entropy of the
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system? - CORRECT ANSWERS ✔✔2H2(g) + O2(g) -> 2H2O (l)
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, Which reaction produces an increase in the entropy of the
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system? - CORRECT ANSWERS ✔✔CO2(s) -> CO2(g)
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Which of the following processes produces a decrease of the
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entropy of the system? - CORRECT ANSWERS ✔✔dissolving
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oxygen in water |\ |\




DeltaS is negative for the reaction - CORRECT ANSWERS
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✔✔2SO2(g) + O2(g) -> 2SO3(g) |\ |\ |\ |\




DeltaS is positive for the reaction - CORRECT ANSWERS
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✔✔2H2O(g) -> 2H2(g) + O2(g) |\ |\ |\ |\




DeltaS is negative for the reaction - CORRECT ANSWERS
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✔✔Mg(NO3)2(aq) + 2NaOH(aq) -> Mg(OH)2(s) + 2NaNO2(aq) |\ |\ |\ |\ |\ |\




Which one of the following correctly indicates the relationshop
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between the entropy of a system and the number of different
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arrangement, W, in the system? - CORRECT ANSWERS ✔✔S = k |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


lnW


The entropy change accompanying any process is given by the
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equation - CORRECT ANSWERS ✔✔DeltaS = k ln(Wfinal/Winitial)
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Of the following, the entropy of gaseous ___ is the largest at 25 C
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and 1 atm... - CORRECT ANSWERS ✔✔C2H6
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