Section 16.5
Reaction Spontaneity
Practice Test
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
Hint
2.
At one atmosphere pressure and the melting point of a substance, which statement is true about this general equation? solid 3 liquid
a.
ΔH = 0 for the process
b.
ΔS = 0 for the process
c.
ΔG = 0 for the process
d.
Both ΔH and ΔS = 0 for the process
Hint
3.
Calculate the ΔG° for the reaction:
2C
2
H
2
(g) + 5O
2
(g) → 4CO
2
(g) + 2H
2
O(l)ΔG° (kJ/mol)209.2, 0, -394.4, -237.2
a.
-1409 kJ
b.
-2599 kJ
c.
-1643 kJ
d.
-2470 kJ
Hint
4.
A process can never be spontaneous when it is _________.
a.
exothermic, and there is an increase in disorder
b.
endothermic, and there is an increase in disorder
c.
exothermic, and there is a decrease in disorder
d.
endothermic, and there is a decrease in disorder
Hint
