According to the Second Law of Thermodynamics, for any spontaneous process in an isolated system, the entropy:

CHE 221 Entropy online quiz

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Chemistry
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University
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Louell Hipulan
Used 2+ times
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8 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 2 pts
A) Decreases
B) Remains constant
C) Increases
D) Becomes zero
2.
MULTIPLE CHOICE QUESTION
20 sec • 2 pts
Which of the following represents a system with higher entropy?
A) Ice cube
B) Water at 25°C
C) Steam at 100°C
D) Diamond
3.
MULTIPLE CHOICE QUESTION
20 sec • 2 pts
When a gas expands isothermally and reversibly, what happens to the entropy of the system?
A) Decreases
B) Remains the same
C) Increases
D) Becomes negative
4.
MULTIPLE CHOICE QUESTION
10 sec • 2 pts
In which of the following phase transitions is entropy expected to decrease?
A) Vapor to liquid
B) Solid to liquid
C) Solid to gas
D) Ice melting
5.
MULTIPLE CHOICE QUESTION
20 sec • 2 pts
A spontaneous process in an open system at constant temperature and pressure is characterized by:
A) ΔS universe < 0
B) ΔG < 0
C) ΔH > 0
D) ΔS system > 0
6.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
A sample of 1.00 mol of an ideal gas expands isothermally and reversibly from an initial volume of 5.00 L to 15.00 Lat a constant temperature of 300 K.
Calculate the entropy change of the gas during this process.
A) 5.76 J/mol·K
B) 8.31 J/mol·K
C) 9.13 J/mol·K
D) 10.22 J/mol·K
7.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
For a certain ideal gas Cp=5/2R cal/mol-ºC. Calculate the change in entropy suffered by 3 moles of the gas on being heated from 300 to 600ºK at (a) Constant pressure (b) Constant volume
A) (a) 8.20 cal/K (b) 5.00 cal/K
B) (a) 10.33 cal/K (b) 6.20 cal/K
C) (a) 12.00 cal/K (b) 7.50 cal/K
D) (a) 9.10 cal/K (b) 5.80 cal/K
8.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
Calculate the entropy change ΔSΔS in J/mol·K for 1.00 mol of butane gas when it is heated from 300 K to 600 K at constant pressure, using the polynomial heat capacity equation in your handbook:
Cp∘=C1+(C2*T)+(C3*T^2)+(C4*T^3)+(C5*T^4)
A) 28.75 J/mol·K
B) 31.20 J/mol·K
C) 34.50 J/mol·K
D) 39.80 J/mol·K
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