Chemistry (Chang), 10th Edition

Chapter 4: Reactions in Aqueous Solution

Self Assessment A

1
Which of the following compounds is most likely to dissolve in water?
A)BaSO4
B)AgBr
C)CaCO3
D)Na2S
E)None of these compounds would dissolve in water.
2
Which of the following is the correct net ionic equation for the reaction that occurs when solutions of Pb(ClO3)2 and Na2SO4 are mixed?
A)ClO3-(aq) + Na+(aq) ----> NaClO3(s)
B)Pb2+(aq) + SO42-(aq) ----> PbSO4 (s)
C)Pb(ClO3)2(aq) + Na2SO4(aq) ----> PbSO4(s) + 2 NaClO3(aq)
D)Pb2+(aq) + 2 ClO3-(aq) + 2 Na+(aq) + SO42-(aq) ----> PbSO4(s) + 2 Na+(aq) + 2 ClO3-(aq)
E)None of the above
3
Which of the following is the chemical formula of the salt produced by the neutralization of potassium hydroxide with nitric acid?
A)KOH
B)HNO3
C)H2O
D)KNO3
4
What element is oxidized in the following reaction?

Cd(s) + NiO2(s) + 2 H2O(l) ----> Cd(OH)2(aq) + Ni(OH) 2(aq)
A)Cd
B)H
C)Ni
D)O
E)None of the elements are oxidized. This is not an oxidation-reduction reaction.
5
In the following reaction, which element is the oxidizing agent?

3 Cu(s) + 8 HNO3(aq) ----> 3 Cu(NO3)2(aq) + 2 NO(g) + 4 H2O (l)
A)Cu
B)H
C)O
D)N
E)There is no oxidizing agent. This is not an oxidation-reduction reaction.
6
Which of the following is an example of a metal displacement reaction?
A)2 P(s) + 3 Cl2(g) ----> 2 PCl3(g)
B)CaBr2(aq) + H2SO4(aq) ----> CaSO4(s) + 2 HBr(aq)
C)2 Na(s) + 2 H2O(l) ----> 2 NaOH(aq) + H2(g)
D)C3H8(g) + 5 O2(g) ----> 3 CO2(g) + 4 H2O(g)
E)Fe2O3(s) + 2 Al(s) ----> 2 Fe(s) + Al2O3(s)
7
How many grams of lead nitrate, Pb(NO3)2, are needed to make 0.500 L of 0.105 M Pb(NO3)2?
A)5.25 x 10-2 g
B)34.8 g
C)17.4 g
D)165.6 g
E)None of the above
8
To analyze for barium in an unknown white powder, an excess of sodium sulfate solution was added to a 0.624 g sample of the powder dissolved in water. A white precipitate of BaSO4 was isolated, dried, and found to weigh 0.438 g. What is the mass percent of Ba in the white powder?
A)0.267%
B)41.3%
C)58.9%
D)70.2%
E)None of the above
9
The acidic substance in vinegar is acetic acid, HC2H3O2. When 4.00 g of a certain vinegar sample was titrated with 0.200 M NaOH, 25.56 mL of the NaOH solution were required to reach the equivalence point. What is the percent composition by mass of HC2H3O2 in the vinegar?
A)7.68%
B)30.7%
C)76.8%
D)3.84%
E)None of the above
10
The mass percent of iron in an iron ore can be determined by converting Fe to Fe2+ in acid solution, and then titrating the dissolved sample with KMnO4 solution. A 2.51 g ore sample dissolved in acid required 28.62 mL of 0.0821 M KMnO4 to reach the equivalence point. Calculate the mass percent of iron in the ore.

8 H+(aq) + 5 Fe2+(aq) + MnO4-(aq) ----> 5 Fe3+ (aq) + Mn2+(aq) + 4 H2O(l)
A)1.05%
B)3.82%
C)5.23%
D)26.1%
E)None of the above
11
A solution able to conduct electricity contains a dissolved substance called a/an:
A)precipitate
B)electrolyte
C)nonelectrolyte
D)equilibrium
12
Which of the following are examples of soluble compounds?
A)Hydroxides
B)Chromates
C)Sulfides
D)Nitrates
13
Which of the following is incorrectly paired?
A)Ba(OH)2; weak electrolyte
B)NaOH; strong electrolyte
C)H3PO4; triprotic acid
D)H2SO4; diprotic acid
14
Which statement is false concerning oxidation numbers?
A)An element's oxidation number is constant and unchanging.
B)Atoms of free elements have an oxidation number of zero.
C)An atom's oxidation state signifies the number of charges for that atom in a molecule.
D)Oxidation numbers allow easy identification of which atoms gained or lost electrons.
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