Ap Chemistry Chapter 16 Multiple Choice Quiz Review With Answers - Malea Mullins, University School Of Jackson Page 5
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13
14At 1 atm, liquid water is heated above 100°C. ΔS
14.
for this process is
surr
a.
greater than zero.
b.
less than zero.
c.
equal to zero.
d.
cannot be determined.
ΔH is + for endothermic reactions.
ΔS
ΔH/T
=
surr
Therefore, ΔS
(+ΔH)/T so ΔS
=
=
surr
surr
(g) N
15.
At constant pressure, the following reaction 2 NO
O
(g) is exothermic. The
2
2
4
reaction (as written) is
a.
always spontaneous
b.
spontaneous at low temperatures, but not high temperatures.
c.
spontaneous at high temperatures, but not low temperatures.
d.
never spontaneous.
ΔH =
because it is exothermic.
ΔS =
because there are more reactant gaseous moles than product gaseous moles.
Chart: If ΔH is
and ΔS is
, then the reaction will be spontaneous at low temperatures.
16.
Consider the following processes (at 298 K):
O (l) H
I.
H
O (g)
2
2
(Gas has more disorder so ΔS = +)
(g) 2 Cl (g)
II.
Cl
2
(More gaseous product moles than reactant gaseous moles so ΔS = +)
(g) Fe
III.
2 Fe (s) + 1.5 O
O
(s)
2
2
3
(More reactant gaseous moles than product gaseous moles so ΔS =
)
(H
O)
2
NaCl (s)
IV.
NaCl (aq)
(Solid dissolves, so more disorder so ΔS = +)
O (l) C
V.
CaC
(s) + 2 H
H
(g) + Ca(OH)
(s)
2
2
2
2
2
(Gas has more disorder so ΔS = +)
(g, 1 atm) N
VI.
N
(g, 2 atm)
2
2
(Increase P, so decrease V. Therefore, less positions, less disorder; so ΔS =
)
For which is ΔS positive?
a.
I, II, IV, V
b.
I, IV, V
c.
I, IV, V, VI
d.
III, VI
e.
all six processes
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