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- 1. Multiple Choice
When ∆ S is negative there is a(n)__________ in Entropy
increase
decrease
exothermic change
endothermic change
- 2. Multiple Choice
When ∆ S is positive there is a(n)__________ in Entropy
increase
decrease
exothermic change
endothermic change
- 3. Multiple Choice
Which reaction has the greatest increase in entropy?
2H20 (l) --> 2H2 (g) + O2 (g)
2H2O(g)--> 2H2(g) + O2(g)
H2O(g) --> H2O(l)
H2O(l) -->H2O(s)
- 4. Multiple Choice
Which process is accompanied by a decrease in entropy?
boiling of water
condensing of water vapor
subliming of iodine
melting of ice
- 5. Multiple Choice
Systems in nature tend to undergo changes toward
lower energy and less disorder
lower energy and more disorder
higher energy and less disorder
higher energy and more disorder
- 6. Multiple Choice
Given the change of phase:
CO2(g) —> CO2(s)
As CO2(g) changes to CO2(s), the entropy of the system
decreases
increases
remains the same
- 7. Multiple Choice
Which phase change represents a decrease in entropy?
solid to liquid
gas to liquid
liquid to gas
solid to gas
- 8. Multiple Choice
Which sample has the lowest entropy?
1 mole of KNO3(l)
1 mole of KNO3(s)
1 mole of H2O(l)
1 mole of H2O(g)
- 9. Multiple Choice
Identify whether the following result in an increase or decrease in entropy:
SUBLIMATION
increase
decrease
- 10. Multiple Choice
Identify whether the following result in an increase or decrease in entropy:
Gas --> Liquid --> solid
increase
decrease
- 11. Multiple Choice
Identify whether the following result in an increase or decrease in entropy:
3 moles of gas (on reactant side) --> 6 moles of gas (product)
increase
decrease
- 12. Multiple Choice
Identify whether the following result in an increase or decrease in entropy:
Vaporization
increase
decrease
- 13. Multiple Choice
A spontaneous process will _____ the entropy of the universe and _____.
decrease, happen on its own without any input from the surroundings
increase, happen on its own without any outside intervention
decrease, not happen on its own without any input from the surroundings
increase, not happen on its own without any input from the surroundings
- 14. Multiple Choice
Let's consider kryptonite, the fictional material that strips Superman of his powers. If liquid kryptonite spontaneously freezes to become solid kryptonite at room temperature, which of the following is true?
Melting of kryptonite at room temperature is not a spontaneous process.
Melting of kryptonite at room temperature is a spontaneous process.
Liquid kryptonite will spontaneously evaporate at room temperature.
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- 15. Multiple Choice
Which of the following is NOT a spontaneous process?
Sugar dissolving in hot coffee
Ice melting at room temperature
Coffee freezing while you drink it on a warm summer day
A nail rusting over the course of years
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