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Basic Chemistry Practice Test: Electrochemistry
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Basic Chemistry Practice Test: Electrochemistry
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25 Questions

1. A positive number for maximum useful work in a spontaneous process (voltaic cell) indicates that the cell will perform work on its surroundings.
2. What is the coefficient of the permanganate ion when the following equation is balanced? MnO4- + Br- . Mn2+ + Br2 (acidic solution)
3. How many minutes will it take to plate out 2.19 g of chromium metal from a solution of Cr3+ using a current of 35.2 amps in an electrolyte cell __________ ?
4. How many kilowatt-hours of electricity are used to produce 3.00 kg of magnesium in the electrolysis of molten MgCl2 with an applied emf of 4.50 V?
5. When the cell potential is negative in a voltaic cell the cell reaction will not proceed spontaneously.
6. Galvanized iron is iron coated with __________.
7. What is the oxidation number of potassium in KMnO4?
8. The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is__________ V when [Zn2+] = 1.0 M and [Pb2+] = 2.0 × 10-4 M. Pb2+ (aq) + Zn (s) . Zn2+ (aq) + Pb (s)
9. The standard cell potential (E°cell) for the voltaic cell based on the reaction below is __________ V. 2Cr (s) + 3Fe2+ (aq) . 3Fe (s) + 2Cr3+ (aq)
10. What is the anode in an alkaline battery __________?
11. Which substance is the reducing agent in the following reaction? Fe2S3 + 12HNO3 . 2Fe(NO3)3 + 3S + 6NO2 + 6H2O
12. How many grams of copper will be plated out by a current of 2.3 A applied for 25 minutes to a 0.50-M solutionof copper(II) sulfate __________?
13. Disadvantages of the methanol fuel cell compared to the hydrogen fuel cell are consumption of catalyst and environmentally safe product.
14. __________ is reduced in the following reaction:
Cr2O72- + 6S2O32- + 14H+ . 2Cr3+ + 3S4O62- + 7H2O
15. How many grams of CuS are obtained by passing a current of 12 A through a solution of CuSO4 for 15 minutes __________?
16. Which one of the following types of elements is most likely to be a good oxidizing agent?
17. The standard cell potential (E°cell) for the voltaic cell based on the reaction below is __________ V. Cr (s) + 3Fe3+ (aq) . 3Fe2+ (aq) + Cr3+ (aq)
18. The standard cell potential (E°cell) for the reaction below is +1.10 V. The cell potential for this reaction is__________ V when the concentration of [Cu2+] = 1.0 × 10-5 M and [Zn2+] = 1.0 M. Zn (s) + Cu2+ (aq) . Cu (s) + Zn2+ (aq)
19. Cathodic protection of a metal pipe against corrosion usually entails
20. In a half reaction the amount of a substance that is reduced or oxidized is directly proportional to the number of electrons generated in the cell.
21. The gain of electrons by an element is called __________.
22. The electrode at which oxidation occurs is called the __________.
23. Which substance is serving as the reducing agent in the following reaction? 14H+ + Cr2O72- + 3Ni . 3Ni2+ + 2Cr3+ + 7H2O
24. Which transformation could take place at the anode of an electrochemical cell?
25. The most useful ore of aluminum is bauxite, in which Al is present as hydrated oxides, Al2O3 . H2O. The number of kilowatt-hours of electricity required to produce 4.0 kg of aluminum from electrolysis of compounds from bauxite is __________ when the applied emf is 5.00 V.

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