Ap Chemistry Chapter 16 Multiple Choice Quiz Review With Answers - Malea Mullins, University School Of Jackson Page 4
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149.
For a spontaneous endothermic process, which of the following must be true?
= ΔG
I.
w
(TRUE!!)
max
ΔS
II.
> 0 (represents exothermic!)
surr
ΔS cannot be negative
III.
(If ΔH is +, then ΔS must also be + in order for ΔG to be negative.)
ΔG is positive (cannot be spontaneous)
IV.
a.
all are true
b.
none are true
c.
I and III
d.
I, II, and IV
e.
III and IV
10.
OMIT
For the reaction A + B C + D, ΔH° = +40 kJ and ΔS° = +50 J/K. Therefore, the
11.
reaction under standard conditions is
a.
spontaneous at temperatures less than 10 K
b.
spontaneous at temperatures greater than 800 K
c.
spontaneous only at temperatures between 10 K and 800 K
d.
spontaneous at all temperatures
e.
nonspontaneous at all temperatures
(If ΔH is + and ΔS is +, then the reaction will be spontaneous at high temperatures.)
T > ΔH / ΔS
Therefore,
T > 40,000 J / 50 J/K
T > 800 K
12.
In which case must a reaction be spontaneous at all temperatures?
ΔH is positive, ΔS is positive
a.
ΔH = 0, ΔS is negative
b.
ΔS = 0, ΔH is positive
c.
ΔH is negative, ΔS is positive
d.
CHART!!!!
e.
none of these
(g) 2 H (g)
13.
Consider the dissociation of hydrogen:
H
2
One would expect that this reaction:
a.
will be spontaneous at any temperature.
b.
will be spontaneous at high temperatures.
c.
will be spontaneous at low temperatures.
d.
will not be spontaneous at any temperature.
e.
will never happen.
(ΔS is +, because there are more possible positions in the products than in the reactants.)
(ΔH is + because it will require added energy to break the bonds between the hydrogens.)
CHART!!!!
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