Identify the appropriate half reactions indicated by the following electrochemical cell in line notation: Pt(s) H2(9) H+(aq) || Cu2+(aq) Cu(s) Anode: Pt(s) + 2 H+ P+2+(aq) + H2(g) Cathode: Cu(s) + 2 e Cu2 (aq) + O Anode: Pt(s) Pt2+(aq) + 2 e- Cathode: Cu2+ + 2 e + Cu(s) O Anode: Cu(s) Cu2+(aq) + 2 e e - Cathode: H2(g) 2H+ + 2 e Anode: H2(g) 2H+ + 2e Cathode: Cu2+ + 2 e Cu(s) O Anode: 2 H+ + 2e H2(g) + - Cathode: Cu(s) - + Cu2+(aq) + 2 e