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Science · Chemistry
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Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions:
Al(s) → Al3+(aq) + 3e
Zn2+(aq) + 2e → Zn(s)

a. Predict the potential of the cell under standard conditions. (4 points)












b. Predict whether the reaction will occur spontaneously, or whether a source of electricity will be required for the reaction. Justify your answer. (2 points)












c. In terms of the metals involved, predict the direction electrons will flow in the reaction. (2 points)












d. Predict which electrode will lose mass and which will gain mass. (2 points)

3. An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is:
Zn(s) → Zn2+(aq) + 2e
The cell potential for the reaction is Eºcell = 1.83 V.

a. Is the reaction spontaneous or nonspontaneous? Explain. (1 point)












b. What is the half-cell potential of the unknown species? (2 points)












c. What is the identity of the unknown element? (2 points)

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