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A voltaic cell is constructed in which the following cell reaction occurs. The half-cell compartments are connected by a salt bridge. 2Ag^+(aq) + Cu(s) → 2Ag(s) + Cu^2+(aq) In the external circuit, electrons migrate ____ the Ag|Ag^+ electrode ____ the Cu|Cu^2+ electrode. In the salt bridge, anions migrate ____ the Cu|Cu^2+ compartment ____ the Ag|Ag^+ compartment.