Section 16.5
Reaction Spontaneity
Practice Test
1.
Which of the following processes occurs with a decrease in entropy?
SC.A.1.4.3
a.
sublimation of dry ice
b.
dissolving salt in water
c.
freezing of water
d.
boiling water
Hint
2.
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
SC.B.2.4.7
a.
-1409 kJ
b.
-2599 kJ
c.
-2470 kJ
d.
-1643 kJ
Hint
3.
At one atmosphere pressure and the melting point of a substance, which statement is true about this general equation? solid 3 liquid
SC.A.1.4.3
a.
ΔG = 0 for the process
b.
Both ΔH and ΔS = 0 for the process
c.
ΔH = 0 for the process
d.
ΔS = 0 for the process
Hint
4.
A process can never be spontaneous when it is _________.
SC.B.2.4.1
a.
exothermic, and there is an increase in disorder
b.
exothermic, and there is a decrease in disorder
c.
endothermic, and there is an increase in disorder
d.
endothermic, and there is a decrease in disorder
Hint
