In one episode of the 1960s television sitcom, Gilligan\'s island, the famous \"

Question

In one episode of the 1960s television sitcom, Gilligan's island, the famous "professor" constructed voltaic cells to use as substitutes for their radio's dead batteries. A single D-cell has an emf of 1.5 V. Which scraps of metal from their damaged boat, the Minnow, could best be used to create a 1.5 v voltaic cell? Assume that coconuts make great beakers and that seawater is a terrific electrolyte. Iron/iron (II) (the anchor) -0.44 Lead/Lead(II) (fishing weights) -0.126 Silver/silver(I) (Mrs. Howell's brooch) -0.799 Aluminum/aluminum (III) (the boat's flagpole) -1.677 a. silver anode and lead cathode b. aluminum anode and lead cathode c. lead anode and silver cathode d. aluminum anode and silver cathode. e. iron anode and aluminum cathode For a reaction in a voltaic cell both Delta H degree and Delta degree are positive. Which of the following statements is true? a. E_cell degree will increase with an increase in temperature. b. E_cell degree will decrease with an increase in temperature. c. E_cell degree will not change when the temperature increases. d. Delta G degree > 0 for all temperatures. e. None of the above statements is true. Which statement does NOT correctly describe a "dead" battery with a voltage of 0? a. The free-energy change for the reaction now is 0. b. All the reactants have been converted into products. c. The products and reactants now are in equilibrium. d. Q = K e. cell potential = 0

Explanation / Answer

13) aluminum anode and lead cathode will make end of the cell = 1.5 V

EMF= -0.126 -(-1.677) = 1.55 V

3)

WE KNOW,

Delta G = delta H - T* delta S

-nFE = positive value - T* positive value

E = negative value + T* positive

If we increase T, then E cell will increase .

So correct answer is (a)

15) when the cell is considered as dead means it is at equilibrium.

Q= K

Cell potential=0

Delta G =0

So the wrong option is (b) .

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