Chemistry (Chang), 10th Edition

Chapter 4: Reactions in Aqueous Solution

Self Assessment B

1
Which of the following compounds should be insoluble in water?
A)AgNO3
B)Na2CO3
C)PbCl2
D)Na2S
E)NH4Cl
2
The correct complete ionic equation for the reaction that occurs when aqueous solutions of Ca(NO3)2 and Na2CO3 are mixed is
A)Ca(NO3)2(aq) + Na2CO3(aq) ---> CaCO3(s) + 2 NaNO3(aq)
B)Ca2+(aq) + 2 NO3-(aq) + 2 Na+(aq) + CO32-(aq) ---> CaCO3(s) + 2 Na+(aq) + 2 NO3-(aq)
C)Ca2+(aq) + 2 NO3-(aq) + 2 Na+(aq) + CO32-(aq) ---> Ca2+(aq) + CO32-(aq) + 2 NaNO3(s)
D)Ca2+(aq) + CO32-(aq) ---> CaCO3(s)
E)Na+(aq) + NO3-(aq) ---> NaNO3(s)
3
Which of the following is a neutralization reaction?
A)HCl(aq) + AgNO3(aq) ----> AgCl(s) + HNO3 (aq)
B)CuSO4(aq) + Zn(s) ----> ZnSO4(aq) + Cu(s)
C)2 K(s) + 2 H2O(l) ----> 2 KOH(aq) + H2(g)
D)H2SO4(aq) + 2 NaOH(aq) ----> 2 H2O(l) + Na2SO4(aq)
E)None of the above.
4
What is the oxidation number of Cr in K2Cr2O7?
A)+12
B)+3
C)+4
D)+5
E)+6
5
In which of the following reactions does an oxidation-reduction process occur?
A)HCl(aq) + AgNO3(aq) ----> AgCl(s) + HNO3 (aq)
B)CuSO4(aq) + Zn(s) ----> ZnSO4(aq) + Cu(s)
C)2 K(s) + 2 H2O(l) ----> 2 KOH(aq) + H2(g)
D)2 HCl(aq) + Ca(OH) 2(aq) ----> 2 H2O(l) + CaCl2(aq)
E)B and C
6
What volume of 3.0 M NaOH can be prepared using exactly 96.0 g of NaOH?
A)0.14 L
B)0.70 L
C)0.80 L
D)1.25 L
E)7.20 L
7
What volume of water must be added to 300 mL of 0.75 M HCl to dilute the solution to 0.25 M?
A)900 mL
B)600 mL
C)300 mL
D)930 mL
E)100 mL
8
A 1.25-g sample of ore containing iron pyrite (FeS2) was pulverized and ignited in air, converting the FeS2 to Fe2O3 and SO 2(g). The Fe2O3 produced weighed 0.516 g. What was the percent Fe in the ore?
A)28.9%
B)36.1%
C)14.4%
D)41.3%
E)None of the above.
9
Muriatic acid is a HCl solution available in hardware stores. A 3.00-mL sample of muriatic acid required 15.44 mL of 2.04 M NaOH for complete neutralization. What is the molarity of HCl in the muriatic acid sample?
A)0.0952 M
B)0.396 M
C)0.0227 M
D)10.5 M
E)None of the above.
10
The concentration of hydrogen peroxide (H2O2) in an H2O2 solution can be determined if the solution is acidified and titrated with potassium permanganate, according to the chemical reaction below. What is the molarity of a H2O2 solution if 20.00 mL of the solution requires 28.16 mL of 0.500 M KMnO4 for complete titration?

2 MnO4-(aq) + 5 H2O2(aq) + 6 H+(aq) ----> 5 O2(g) + 2 Mn2+(aq) + 8 H2O(l)
A)0.0352 M
B)0.0250 M
C)1.76 M
D)0.282 M
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