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Q 1/15
Score 0
In the reaction MnO4 + 5Fe2+ + 8H+ --> Mn2+ + 5Fe3+ + 4H2O
60
electrons are transferred from Mn2+ to Fe2+
Fe2+ is oxidized and MnO4- is reduced
Fe3+ is oxidized and Mn2+ is reduced
H+ is oxidized and MnO4- is reduced
Q 2/15
Score 0
The Eo for Mg --> Mg2+ + 2e- is +2.37 volts. The Eo for 2Mg2+ + 4e- --> 2 Mg is
60
2.37 volts
-4.74 volts
4.74 volts
-2.37 volts
15 questions
Q.
In the reaction MnO4 + 5Fe2+ + 8H+ --> Mn2+ + 5Fe3+ + 4H2O
1
60 sec
Q.
The Eo for Mg --> Mg2+ + 2e- is +2.37 volts. The Eo for 2Mg2+ + 4e- --> 2 Mg is
2
60 sec
Q.
The function of a salt bridge (or porous barrier) in an voltaic cell is to allow ions to flow
3
45 sec
Q.
What is the value of delta Go for the reaction written below? 2MnO4- (aq) + 16 H3O+ (aq) + 5Zn (s) --> 2Mn2+ (aq) + 24H2O (l) + 5Zn2+ (aq). You are given the following standard reduction potentials for the two half-reactions. Eo (MnO4-/Mn2+) = +1.49 V. Eo (Zn2+/Zn) = -0.76 V.
4
300 sec
Q.
Given: Mg2+ + 2e- --> Mg (-2.37 V). Fe3+ + 1e- --> Fe2+ (+0.77 V). When the reaction 2Mg + Fe3+ --> 2Mg2+ + Fe2+ comes to equilibrium, the Ecell value (cell potential) becomes
5
60 sec
Q.
For the reaction Cu2+ (aq) + Zn (s) --> Zn2+ (aq) + Cu (s), Eo = +1.10 V When 1.00 mole of zinc is consumed, how many faradays are transferred?
6
60 sec
Q.
The galvanic cell based on the reactions Ag+ + 1e- --> Ag (Eo = +0.80 V) and Fe3+ + 1e- --> Fe2+ (Eo = +0.77 V)
7
120 sec
Q.
Iron can be protected from oxidation by putting it into electrical contact with a substance that is more likely to be oxidized than iron. Given the reduction potentials below, which metals could be used to protect iron? Fe2+ (aq) + 2e- --> Fe (s) (Eo = -0.44 V). Zn2+ (aq) + 2e- --> Zn (s) (Eo = -0.76 V). Cu2+ (aq) + 2e- --> Cu (s) (Eo = 0.34 V). Sn2+ (aq) + 2e- --> Sn(s) (Eo = -0.14 V). Mg2+ (aq) + 2e- --> Mg(s) (Eo = -2.37 V)
8
120 sec
Q.
Copper may be used for electroplating, with a half-reaction of Cu2+ + 2e- --> Cu. If a current of 10.0 A is applied to a Cu2+ solution for 60.0 minutes, the mass of copper plated out can be calculated as
9
300 sec
Q.
Given the following data: Ca2+ (aq) + 2e- --> Ca(s) (Eo = -2.87 V). Zn2+ (aq) + 2e- --> Zn (s) (Eo=-0.76 V). Co2+ (aq) + 2e- --> Co(s) (Eo = -0.28 V). Sn2+ (aq) + 2e- --> Sn(s) (Eo = -0.14 V). Pb2+ (aq) + 2 e- --> Pb(s) (Eo = -0.13 V). Which of the following correctly describes the ease of oxidation of the substances listed under standard state conditions?
10
300 sec
Q.
Ag+ + e- --> Ag (Eo = 0.80 V). Al3+ + 3e- --> Al (Eo = -1.66 V). What is the balanced equation for the spontaneous reaction?
11
120 sec
Q.
Ag+ + e- --> Ag (Eo = 0.80 V). Al3+ + 3e- --> Al (Eo = -1.66 V). What is the Eocell for a voltaic cell using the two half-reactions at 25 deg C?
12
120 sec
Q.
Ag+ + e- --> Ag (Eo = 0.80 V). Al3+ + 3e- --> Al (Eo = -1.66 V). What would happen to the cell potential if NH3 were added to the silver cell and Ag(NH3)2+ forms? (so decreasing the concentration of Ag+ ions)
13
120 sec
Q.
Which of the following statements concerning galvanic cells is/are true?
14
45 sec
Q.
Metal A is more easily oxidized than metal B. What is true of A+ and B+?
