Chemistry: Matter and Change

Section 5: Reaction Spontaneity

Self Check Quizzes

1
Which of the following processes occurs with a decrease in entropy?
A)freezing of water
B)boiling water
C)sublimation of dry ice
D)dissolving salt in water
2
Assuming no change of state, why does the entropy of liquid water increase as it is heated?
A)The molecules get further apart during heating.
B)The heating mechanism becomes more disordered.
C)There is greater random motion of molecules.
D)The molecules get closer together during heating.
3
Gas particles have more entropy when they can move freely than when they are dissolved in a liquid or a solid. Which of the following represents an increase in entropy of the system?
A)Soda pop goes flat as carbon dioxide bubbles escape.
B)Water in an aquarium is oxygenated by a pump.
C)Water vapor consenses on a cold glass.
D)Oxygen is dissolved into your blood.
4
Exothermic chemical reactions accompanied by an increase in entropy are all ________.
A)impossible
B)nonspontaneous
C)spontaneous
D)positive
5
For a particular process, ΔHsystem = -160 kJ and ΔSsystem = -400 J/K. Find ΔGsystem at 298 K. Is the process spontaneous?

ΔGsystem = ΔHsystem - TΔSsystem
A)-40.8 kJ, spontaneous
B)-40.8 kJ, nonspontaneous
C)40.8 kJ, spontaneous
D)40.8 kJ, nonspontaneous
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