WorksheetsEntropy, Enthalpy, and Gibbs Free Energy
Total questions: 12
Worksheet time: 8mins
Name
Class
Date
1.
What signs of Δ H and Δ S will always yield a reaction that is spontaneous ?
a)
Δ H = + Δ S = +
b)
Δ H = - Δ S = -
c)
Δ H = - Δ S = +
d)
Δ H = + Δ S = --
2.
As NaCl dissolves according to the equation
NaCl(s) → Na+(aq) + Cl-(aq), the entropy of the system
NaCl(s) → Na+(aq) + Cl-(aq), the entropy of the system
a)
Increases
b)
Decreases
c)
Remains the same
3.
A reaction has a positive ΔH and a positive ΔS. Which of the following is true?
a)
It will be spontaneous at all temperatures.
b)
It will be nonspontaneous at all temperatures.
c)
It will be spontaneous at low temperatures.
d)
It will be spontaneous at high temperatures.
4.
True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.
a)
True
b)
False
5.
Entropy always increases when
a)
enthalpy decreases.
b)
temperature decreases.
c)
temperature increases.
d)
volume increases.
6.
Predict the entropy change, ΔS.
a)
ΔS = +
b)
ΔS = -
c)
ΔS = 0
d)
ΔS = no change
7.
Thermodynamically favorable reactions tend to go to...
a)
low energy and high entropy
b)
low energy and low entropy
c)
high energy and high entropy
d)
high energy and low entropy
8.
In which case is a reaction spontaneous at all temperatures?
a)
ΔH is positive, ΔS is positive
b)
ΔH = 0, ΔS is negative
c)
ΔS = 0, ΔH is negative
d)
ΔH is negative, ΔS is negative
9.
Thermodynamically unfavorable reactions...
a)
are very slow
b)
occur only with the addition of work
c)
occur without the addition of work
d)
are always exothermic
10.
When ammonium nitrate dissolves in water, the solution gets cold. Which is true?
a)
Reaction is ENDOTHERMIC with positive ΔH
b)
Reaction is ENDOTHERMIC with -ΔH
c)
Reaction is EXOTHERMIC with a -ΔH
d)
Reaction is EXOTHERMIC with +ΔH
11.
Predict the entropy change and its spontaniety
a)
ΔS = +ve and non spontaneous
b)
ΔS = -ve and spontaneous
c)
ΔS = -ve and non spontaneous
d)
ΔS = +ve and spontaneous
12.
Predict the entropy change and its spontaniety
a)
ΔS = +ve and non spontaneous
b)
ΔS = -ve and spontaneous
c)
ΔS = -ve and non spontaneous
d)
ΔS = +ve and spontaneous
100 %
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