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A voltaic electrochemical cell is constructed using the following reaction. The half-cell components are separated by a salt bridge. 2Cr2(aq) + Br(l) → 2Cr^3+(aq) + 2Br^-(aq) Write the reaction that take place at the anode and at the cathode, the direction in which the electrons migrate in the external circuit, and the direction the anions in the salt bridge migrate.