Photosynthesis is a chemical reaction that occurs in nature, but one that is generally not thermodynamically favored. It is forced forward by the presence of light. Which of the following is another example of a thermodynamically unfavored process, which must be forced to occur by the use of an external source of energy?

FGHS AP CHEMISTRY QUIZ #15 Entropy and Free Energy

Quiz
•
Chemistry
•
10th Grade - University
•
Hard
Morey Miller
Used 19+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A galvanic cell
A battery
Electrolysis
Any process with a negative ΔG°
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following combinations of conditions is found to be thermodynamically favored at high temperatures, but unfavored at low temperatures?
An exothermic reaction where the entropy increases
An exothermic reaction where the entropy decreases
An endothermic reaction where the entropy increases
An endothermic reaction where the entropy decreases
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following chemical reactions has a positive ΔS°?
Mg2+(aq) + 2OH-(aq) → Mg(OH)2(s)
CaO(s) + CO2(g) → CaCO3(s)
H2O(l) → H2O(s)
PCl5(g) → PCl3(g) + Cl2(g)
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is true of the entropy values, S°of all substances at absolute zero?
They are all positive
They are all negative
They can be positive or negative depending upon the temperature and the reaction
More information is required to answer this question
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Given the absolute entropies below, all given in units of J K-1 mol-1, calculate ΔS° for the formation of NH3(g) from its elements.
S° N2(g) = 192
S° H2(g) = 131
S° NH3(g) = 193
N2(g) + 3H2(g) → 2NH3(g)
+516 J K-1 molrxn-1
-1189 J K-1 molrxn-1
-130 J K-1 molrxn-1
-199 J K-1 molrxn-1
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which situation described below, is the one with the greatest entropy?
A piece of copper wire at 298 K
A sample of PCl3 gas at 298 K in a 1.00 L container
A sample of PCl3 gas at 298 K in a 5.00 L container
A 10.0 L container of water at 298 K
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which combination of ΔG°, K and rate of reaction, best describes a thermodynamically favored reaction?
ΔG is negative, K > 1 and the rate of reaction is fast
ΔG is negative, K > 1 and the rate of reaction is slow
ΔG is negative, K > 1 and the rate of reaction can be fast or slow
ΔG is positive, K < 1 and the rate of reaction is slow
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