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Self Assessment A
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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) ----> NaClO 3(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) + Al2 O3(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, HC2H3 O2. 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 react 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.





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