help with the following pls

Au3+(aq)+3eAu(s),Er=+1.50VSn2+(aq)+2eSn(s),Er=0.14VCo2+(aq)+2eCo(s),Er=0.28VCa2+2aq)+2eCa(s),Er=2.76V From the reactions above, a spontaneous reaction will occur if gold ion reacts with what? calcium metal cobalt metal all of the above tin metal Hg2+(aq)+2eHg(l),Er0=+0.80VAg+(aq)+eAg(s),Er=+0.80VCu+(aq)+eCu(s),Er=+0.52VCd2+(aq)+2eCd(s),Er=0.40V What is the strongest reducing agent in the list of half-reactions and reduction potentials above? silver ion cadmium metal mercury ion copper metal Which of the following statements is true for an aluminum-copper galvanic cell? The cations in the salt bridge move toward the aluminum electrode. Electrons flow from the copper electrode to the aluminum electrode. Electrons flow from the aluminum electrode to the copper electrode. The anions in the salt bridge move toward the copper electrode. Question 17 (1 point) Saved What function does a salt bridge perform? It carries electrons from the anode to the cathode It carries electrons from the cathode to the anode It reacts with excess ions to form insoluble salts It seals the aqueous solutions in the system so they do not mix It completes the circuit as ions migrate in the U-shaped tube