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Chapter 4: Reactions in Aqueous Solution
Problem Solving Center
Self Quiz 2
Self Quiz 2
This activity contains 20 questions.
Give the net ionic equation for the reaction 2Al(
s
) + 6HCl(
aq
) ---> 2Al
Cl
3
(
aq
) + 3H
2
(
g
).
Al(
s
) + 3H
+
(
aq
) ---> Al
3+
+ 3H(
g
)
2Al(
s
) + 6H
+
(
aq
) ---> 2Al
3+
(
aq
) + 3H
2
(
g
)
Al(
s
) + 4H
+
(
aq
) ---> Al
3+
(
aq
) + 2H
2
(
g
)
2Al(
s
) ---> 2Al
3+
(
aq
)
6H
+
(
aq
) ---> 3H
2
(
g
)
In the equation Ca(
s
) + 2H
2
O(
l
) ---> Ca
2+
(
aq
) + 2OH
-
(
aq
) + H
2
(
g
)
Ca is the oxidizing agent and H
2
O is being reduced.
Ca is being reduced and H
2
O is being reduced.
Ca is being reduced and H
2
O is the oxidizing agent.
Ca is the reducing agent and H
2
O is being reduced.
Ca is the reducing agent and H
2
O is being oxidized.
The balanced ionic equation for the neutralization reaction of aqueous HClO
4
and aqueous Ca(OH)
2
is
H
+
(
aq
) + ClO
4
-
(
aq
) + Ca
2+
(
aq
) + 2OH
-
(
aq
) ---> Ca
2+
(
aq
) + ClO
4
-
(
aq
) + H
2
O(
l
).
HClO
4
(
aq
) + Ca(OH)
2
(
aq
) ---> H
2
O(
l
) + CaClO
4
(
aq
).
HClO
4
(
aq
) + Ca(OH)
2
(
aq
) ---> H
2
O(
l
) + Ca(ClO
4
)
2
(
aq
).
2HClO
4
(
aq
) + Ca
2+
(
aq
) + 2OH
-
(
aq
) ---> Ca
2+
(
aq
) + 2ClO
4
-
(
aq
) + 2H
2
O(
l
).
2H
+
(
aq
) + 2ClO
4
-
(
aq
) + Ca
2+
(
aq
) + 2OH
-
(
aq
) ---> Ca
2+
(
aq
) + 2ClO
4
-
(
aq
) + 2H
2
O(
l
).
The balanced net ionic equation for the neutralization reaction of aqueous HBr and aqueous Ba(OH)
2
is
2H
+
(
aq
) + 2OH
-
(
aq
) ---> 2H
2
O(
l
).
H
+
(
aq
) + OH
-
(
aq
) ---> H
2
O(
l
).
HBr(
aq
) + OH
-
(
aq
) ---> H
2
O(
l
) + Br
-
(
aq
).
2HBr(
aq
) + 2OH
-
(
aq
) ---> 2H
2
O(
l
) + 2Br
-
(
aq
).
2H
+
(
aq
) + Ba(OH)
2
(
aq
) ---> 2H
2
O(
l
) + Ba
2+
(
aq
).
The correctly balanced equation for the reaction H
2
O
2
(
aq
) + Al(
s
) ---> H
2
O(
l
) + Al
3+
(
aq
) in an acidic solution is
2H
+
(
aq
) + H
2
O
2
(
aq
) + Al(
s
) ---> 2H
2
O(
l
) + Al
3+
(
aq
).
3H
2
O
2
(
aq
) + 3H
2
(
aq
) + 2Al(
s
) ---> 6H
2
O(
l
) + 2Al
3+
(
aq
).
H
2
O
2
(
aq
) + Al(
s
) ---> 2H
2
O(
l
) + Al
3+
(
aq
).
3H
2
O
2
(
aq
) + 6H
+
(
aq
) + 2Al(
s
) ---> 6H
2
O(
l
) + 2Al
3+
(
aq
).
3H
2
O
2
(
aq
) + 12H
+
(
aq
) + Al(
s
) ---> 6H
2
O(
l
) + Al
3+
(
aq
).
The mass of Ag that is required to react completely with 35.5 mL of 0.205 M solution of In
3+
according to the equation 3Ag(
s
) + In
3+
(
aq
) ---> 3Ag
+
(
aq
) + In(
s
) is
2.36 g.
56.0 g.
2.36 x 10
3
g.
1.03 g.
0.262 g.
What are the spectator ions in the molecular equation
Ca(HSO
3
)
2
(
aq
) + H
2
SO
4
(
aq
) ---> SO
2
(
g
) + H
2
O(
l
) + CaSO
4
(
aq
)?
Ca
2+
and SO
3
2-
There are no spectator ions.
Ca
2+
and SO
4
2-
H
+
and SO
4
2-
H
+
and SO
3
2-
What is the molarity of Cl
-
when 45.0 mL of 0.350 M Na
2
Cr
2
O
7
2-
is required for complete reaction with 30.0 mL of the Cl
-
solution according to the equation Cr
2
O
7
2-
(
aq
) + 14H
+
(
aq
) + 6Cl
-
(
aq
) ---> 3Cl
2
(
g
) + 2Cr
3+
(
aq
) + 7H
2
O(
l
)?
The molarity is 3.15 M.
The molarity is 0.525 M.
The molarity is 25.7 M.
The molarity is 0.00284 M.
The molarity is 0.0875 M.
What is the net ionic equation for the precipitation reaction, if any, that occurs when an aqueous solution of CuSO
4
is mixed with an aqueous solution of K
2
CrO
4
(
aq
)?
2K
+
(
aq
) + SO
4
2-
(
aq
) ---> K
2
SO
4
(
s
)
Cu
2+
(
aq
) + CrO
4
2-
(
aq
) ---> CuCrO
4
(
s
)
There is no reaction.
Cu
2+
(
aq
) + 2H
2
O(
l
) ---> Cu(OH)
2
(
s
) + 2H
+
(
aq
)
Cu
2+
(
aq
) + SO
4
2-
(
aq
) + 2K
+
(
aq
) + CrO
4
2-
(
aq
) ---> CuCrO
4
(
s
) + K
2
SO
4
(
s
)
Which combination of an element and an ion will react?
H
2
(
g
) and Na
+
(
aq
) will react.
Sn(
s
) and Mn
2+
(
aq
) will react.
Mg(
s
) and Ba
2+
(
aq
) will react.
Ni(
s
) and Pt
2+
(
aq
) will react.
Fe(
s
) and Ca
2+
(
aq
) will react.
Which combination of solutions will produce a single precipitate?
Li
2
S(
aq
) and FeBr
3
(
aq
)
FeSO
4
(
aq
) and KNO
3
(
aq
)
KI(
aq
) and NiCl
2
(
aq
)
NaCl(
aq
) and Ba(NO
3
)
2
(
aq
)
Zn(CH
3
CO
2
)
2
(
aq
) and (NH
4
)
2
SO
4
(
aq
)
Which compound, when dissolved in water, will form a solution that will complete a circuit, so that a light will be dim,
not
bright, when connected to a power supply?
CH
3
COOH
CH
3
OH
C
2
H
5
OH
Li
3
PO
4
Ca(OH)
2
Which equation is the correctly balanced equation for the redox reaction
SO
3
2-
(
aq
) + CrO
4
2-
(
aq
) ---> SO
4
2-
(
aq
) + CrO
2
-
(
aq
) in a basic solution?
SO
3
2-
(
aq
) + 2CrO
4
2-
(
aq
) + 2OH
-
(
aq
) ---> SO
4
2-
(
aq
) + 2CrO
2
-
(
aq
) + 2O
2
(
g
) + H
2
O(
l
)
SO
3
2-
(
aq
) + 2CrO
4
2-
(
aq
) + H
2
O(
l
) ---> SO
4
2-
(
aq
) + 2CrO
2
-
(
aq
) + 2O
2
(
g
) + 2H
+
(
aq
)
3SO
3
2-
(
aq
) + 2CrO
4
2-
(
aq
) + H
2
O(
l
) ---> 3SO
4
2-
(
aq
) + 2CrO
2
-
(
aq
) + 2OH
-
(
aq
)
3SO
3
2-
(
aq
) + 2CrO
4
2-
(
aq
) + 2H
+
(
aq
) ---> 3SO
4
2-
(
aq
) + 2CrO
2
-
(
aq
) + H
2
O(
aq
)
2SO
3
2-
(
aq
) + CrO
4
2-
(
aq
) ---> 2SO
4
2-
(
aq
) + CrO
2
-
(
aq
)
Which is
not
a characteristic of an oxidizing agent?
If it is an anion, its charge becomes more negative.
It gains one or more electrons.
It undergoes a reduction.
It loses one or more electrons.
Its oxidation number decreases.
Which process is
not
an oxidation? Assume the oxidation number of O is always -2.
Fe
2+
---> Fe
3+
N
2
---> 2NO
3
-
Cu
2+
---> Cu
+
Cr
3+
---> CrO
4
2-
Na ---> Na
+
Which reaction is a redox reaction?
2Al(
s
) + 6H
3
O
+
(
aq
) ---> 2Al
3+
(
aq
) + 3H
2
(
g
) + 6H
2
O(
l
) is a redox reaction.
Mg(OH)
2
(
s
) + H
3
O
+
(
aq
) ---> Mg
2+
(
aq
) + 4H
2
O(
l
) is a redox reaction.
CH
3
COOH(
aq
) + OH
-
(
aq
) ---> CH
3
COO
-
(
aq
) + H
2
O(
l
) is a redox reaction.
H
2
SO
3
(
aq
) ---> H
2
O(
l
) + SO
2
(
g
) is a redox reaction.
3Fe
2+
(
aq
) + 2PO
4
3-
(
aq
) ---> Fe
3
(PO
4
)
2
(
s
) is a redox reaction.
Which reaction is an oxidation-reduction reaction?
Mn(
s
) + NiSO
4
(
aq
) ---> MnSO
4
(
aq
) + Ni(
s
)
Na
2
S(
aq
) + Ba(NO
3
)
2
(
aq
) ---> BaS(
s
) + 2NaNO
3
(
aq
)
Mg(OH)
2
(
s
) + 2HBr(
aq
) ---> MgBr
2
(
aq
) + 2H
2
O(
l
)
LiOH(
aq
) + HCl(
aq
) ---> LiCl(
aq
) + H
2
O(
l
)
NaCl(
s
) ---> Na
+
(
aq
) + Cl
-
(
aq
)
Which reaction of a metal and aqueous acid will
not
occur?
Cu(
s
) and H
+
(
aq
) will
not
occur.
K(
s
) and H
+
(
aq
) will
not
occur.
Cr(
s
) and H
+
(
aq
) will
not
occur.
Sn(
s
) and H
+
(
aq
) will
not
occur.
Ca(
s
) and H
+
(
aq
) will
not
occur.
Which set of compounds contains a salt that is soluble?
Hg
2
Br
2
, Ni(OH)
2
, Cr
2
S
3
Ca
3
(PO
4
)
2
, ZnO, ZnCO
3
CdCO
3
, PbSO
4
, ZnS
CdCO
3
, PbSO
4
, (NH
4
)
2
CO
3
BaCrO
4
, AgCl, Fe(OH)
3
Which solution does
not
contain a total of 1.50 moles of ions, assuming complete dissociation of these strong electrolytes?
1.50 L of 0.500 M LiBr
0.500 L of 0.750 M K
3
PO
4
0.500 L of 3.00 M NaI
2.00 L of 0.250 M CaI
2
1.00 L of 0.750 M NaCl
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