An electrochemical cell is an instrument composed of 2 half-cells connected by a conductive wire.
Concept #1: Electrochemical Cells are designed to deal with redox reactions to either harness or use their potential energy.
Concept #2: The sign of the cell potential determines if an electrochemical cell produces or consumes electricity.
Example #1: EXAMPLE: Which of the following electrochemical cells would use up the largest quantity of electricity at 25ºC?
a) Electrochemical Cell A (Eºcell = -0.75 V)
b) Electrochemical Cell B (Eºcell = +1.30 V)
c) Electrochemical Cell C (Eºcell = +0.08 V)
d) Electrochemical Cell D (Eºcell = -1.42 V)