General Chemistry Ii Jasperse - Electrochemistry Extra Practice Problems With Answers Page 9
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139
Ranking Relative Activity, Based on Observed Reactivity or Lack Thereof
46. Given the following laboratory observation, which of the following statements is NOT TRUE?
1. Reaction means the reacting cation is stronger oxidant
T
Sn + 2AgBr ! 2Ag + SnBr
and reacting metal is stronger reducing agent than the
2
2Ag + SnBr
! No Reaction
product cation/metal.
2
2. No reaction means the reacting cation is weaker
oxidizing agent and reacting metal is weaker reducing
a. Sn is a stronger reducing agent than Ag
agent than the product cation/metal would be.
+
2+
b. Ag
is a stronger oxidizing agent than Sn
+
2+
c. The reduction potential for Ag
is more positive than the reduction potential for Sn
2+
+
d. Sn
is a stronger oxidizing agent than Ag
e. none of the above
47. Given the following laboratory observation, which of the following statements is NOT TRUE?
Zn + CuBr
! Cu + ZnBr
2
2
Cu + ZnBr
! No Reaction
2
a. Zn is a stronger reducing agent than Cu
+2
2+
b. Cu
is a stronger oxidizing agent than Zn
c. Cu is a stronger reducing agent than Zn
d. The fact that copper doesn’t react with ZnBr
proves that copper loves/attracts/holds electrons more than does zinc.
2
e. none of the above
48. Given the following laboratory observation, which of the following statements is NOT TRUE?
1. Reaction means the reacting cation is stronger oxidant
and reacting metal is stronger reducing agent than the
Mg + NiBr
! Ni + MgBr
2
2
product cation/metal.
Ni + MgBr
! No Reaction
2
T
2. No reaction means the reacting cation is weaker
oxidizing agent and reacting metal is weaker reducing
2+
a. Ni loves electrons more than Mg. That’s why Mg gives electrons to Ni
agent than the product cation/metal would be.
2+
b. Mg loves electrons less than Ni. That’s why Mg
doesn’t take electrons from Mg
c. When a redox reaction does NOT occur (equation 2), it means that the reduced form of nickel is a weaker reducing
agent than the reduced form of Mg
d. When a redox reaction DOES occur (equation 1), it means that the reduced form of Mg is a stronger reducing
agent than the reduced form of Ni
e. When a redox reaction does NOT occur (equation 2), it means that the reduced form of nickel is a stronger
reducing agent than the reduced form of Mg
49. Which of the following correctly ranks the “activity” (strength as reducing agents) of the elements Ag, Au, and Sn,
given the following observed reactivity information?
Sn + 2AgBr ! SnBr
+ 2Ag
2
3Sn + 2AuBr
! 3SnBr
+ 2Au
3
2
3Ag + AuBr
! 3AgBr + Au
3
a. Sn > Ag > Au
b. Sn > Au > Ag
c. Au > Ag > Sn
d. Ag > Au > Sn
T
50. Which of the following correctly ranks the “activity” (strength as reducing agents) of the elements Cu, Cd, and Zn,
given the following observed reactivity information?
1. Reaction means the reacting cation is stronger oxidant
and reacting metal is stronger reducing agent than the
Zn + CuBr
! Cu + ZnBr
product cation/metal.
2
2
Cd + ZnBr
! No Reaction
2. No reaction means the reacting cation is weaker
2
Cu + CdBr
! No Reaction
oxidizing agent and reacting metal is weaker reducing
2
agent than the product cation/metal would be.
a. Zn > Cu > Cd
b. Zn > Cd > Cu
c. Cd > Cu > Zn
d. Cu > Cd > Zn
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