One of the differences between a voltaic cell and an electrolytic cell is that i

Question

One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell. A) oxidation occurs at the cathode B) an electric current is produced by a chemical reaction C) electrons flow toward the anode D) O_2 gas is produced at the cathode K) a nonspontaneous reaction is forced to occur 15) How many minutes will it take to plate out 16.22 g of Al metal from a solution of A13+ using a current of 14.6 amps in an electrolytic cell? A) 153 B) 53.0 C) 199 D) 11900 E) 66.2 16) The most useful ore of aluminum is bauxite, in which Al is present as hydrated oxides, A1_2O_3 xH_20. The number of kilowatt-hours of electricity required to produce 3.00 kg of aluminum from electrolysis of compounds from bauxite is-when the applied emf is 4 A) 0.0249 B) 0.0402 Q 13.4 D)40.2 E) 26.8

Explanation / Answer

QUESTION 14

Answer E)

Let us consider each option seperately.

a) FALSE: Oxidation always occurs at the anode whether the cell is a voltaic or electrolytic one.

b) FALSE: An electric current is produced only in voltaic cells, not electrolytic.

c) FALSE: Electrons flow towards the cathode in electrolytic cells.

d) FALSE: Whatever produced at the anode and cathoe, depends on the substances present in the cell. it cannot be arbitarily stated that O2 is always produced.

e) TRUE: A voltage is supplied in electrolytic cells so that nonspontaneous reactions occur.

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