1. The balanced overall equation for: Fe2+(aq) + Br-(aq) ? Fe(s) + Br2(g) A. 2Fe

Question

1. The balanced overall equation for:  Fe2+(aq) + Br-(aq) ? Fe(s)  +  Br2(g)

                A.            2Fe2+(aq) + 6Br-(aq) ? 2Fe(s)  + 3Br2(g)

                B.             Fe2+(aq) + 2Br-(aq) ? Fe(s)  + Br2(g)

                C.             3Fe2+(aq) + 2Br-(aq) ? 3Fe(s)  + Br2(g)

2. Calculate the Ecell of:  Al(s) + Pb2+(aq)(0.010M) ? Al3+(aq)(1.0M) + Pb(s)  (is this balanced?)

                A.            1.47

                B.             1.59

                C.             -1.59

3. How many faradays is needed to "plate out" 100.0 g of manganese? (use table 41.1 for charge)

                A.            3.6

                B.             2.8 x 10-6

                C.             3.5 x 105

4. Calculate the Eocell for:  Ag(s) +Zn+(aq)  ? Ag+(aq) + Zn(s) ; is this electrolytic or voltaic?

                A.            1.56V ; voltaic

                B.             -1.56V ; electrolytic

                C.             1.56V ; electrolytic

                D.            -1.56V ; voltaic

5. When a solid piece of silver is placed in a solution of SnCl2 a reaction will occur

True

False

6. Calculate the Ecell of:  Au(s) ; Au3+(aq) // Sn2+(aq) ; Sn(s)    is this electrolytic or voltaic?

                A.            -1.64 ; voltaic

                B.             -1.64 ; electrolytic

                C.             1.64 ; electrolytic

                D.            1.64 ; voltaic

Explanation / Answer

1)B

2)A

3) the charge is not mentioned in problems

4)D

5)FALSE

6)A   ACTUALLY ANSWER IS -1.54VOLTS    BECAUSE THE REDUCTION POTENTIAL OF Sn is -0.14,,,,Au IS -1.40

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