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13 Dec 2019

  1. Nitrogen can be prepared by electrolysis of an aqueous nitratesolution

    1.

    False
    2.

    True

1 points

  1. What product(s) forms at the cathode in the electrolysis of anaqueous solution of NaF?

    1.

    Na
    2.

    O2 and H+
    3.

    F2
    4.

    H2 and OH-

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Elin Hessel
Elin HesselLv2
17 Dec 2019

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4. Chlorine will spontaneously react with iodide to producechloride and iodine. What is Eo for this reaction.

1) A constant current of 0.800 A is run through the electrolytic cell in order to produce oxygen (gas) at the anode:

2 H2O → O2(g) + 4 e- + 4 H+

The amount (in grams) of O2 obtained after 15.2 min of electrolysis is [X] g

2) Electrolysis of a solution of Tl3+ produces deposition of elemental thallium, Tl, at the cathode. The time (in min.) needed for a constant current of 1.20 A to deposit 0.500 g of Tl(s) is [X] min.

3) An electrochemical cell is described by the following line notation:

Zn(s) ǀ Zn2+(aq) (0.0420 M) ǀǀ Tl3+(aq) (9.06×10-2 M), Tl+(aq) (0.0400 M) ǀ Pt(s).

Given: E°(Zn2+/Zn) = - 0.763 V; E°(Tl3+/Tl+) = + 1.25 V.

The potential on the cathode half-cell, E+ = V; the potential on the anode half-cell, E- = V; and the overall cell potential, Ecell = V.

4) Consider electrolysis of molten copper bromide, CuBr2. What is the product of this process obtained (a) at the cathode? (b) at the anode?

1. a) Cathode: Cu(s);
(b) Anode: Br2(l)

2. (a) Cathode: Br2(l);

(b) Anode: Cu(s)

3. (a) Cathode: Cu2+;

(b) Anode: Br-

4. (a) Cathode: Br-;

(b) Anode: Cu2+

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(b) Anode: O2(g)

6. (a) Cathode: H2(g);

(b) Anode: Cu2+

Write the half-reactions and the products for the reactions that occur in the electrolysis of a saturated solution of magnesium sulfate using inert electrodes. Choose at least one answer. should be 3-4 right answers a. 2Cl- ? 2Cl2(g) + 2e- (anode) b. 2H2O(l) ? O2(g) + 4H+(aq) + 4e- (anode) c. 2SO42-(aq) ? S2O82-(aq) + 2e- (anode) d. Ni(s) ? Ni2+(aq) + 2e- (anode) e. Ni2+(aq) + 2e- ? Ni(s) (cathode) f. Mg2+(aq) + 2e- ? Mg(s) (cathode) g. 2H2O (l) + 2e-? H2(g) + 2OH - (aq) (cathode) h. No net reaction. However, metal is transfer from the anode to the cathode. i. Cl2(g) j. H2(g) k. O2(g) l. Mg(s) m. Ni(s) n. S2O82-(aq) o. OH -(aq)

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