Consider the following half-reactions: Half-reaction E° (V) Br2(1) + 2e → 2B1¯(aq) 1.080V Co2+(aq) + 2e → Co(s) -0.280V Cr3+(aq) + 3e Cr(s) -0.74OV (1) The strongest oxidizing agent is: enter formula (2) The weakest oxidizing agent is: (3) The weakest reducing agent is: (4) The strongest reducing agent is: (5) Will Cr3+(aq) oxidize Br"(aq) to Br2(1)? no (6) Which species can be oxidized by Co2+(aq)? If none, leave box blank.

Be sure to answer all parts. (a) Balance the skeleton reaction. Include the states of matter for each substance. (b) Calculate E (c) Determine whether the reaction is spontaneous. A table of standard electrode potentials is given below for reference. Cl₂(g) + Fe2+ (aq) → CI (aq) + Fe³+ (aq) (a) (b) (c) O Strength of oxidizing agent cell V not spontaneous spontaneous Selected Standard Electrode Potentials (298 K) Half-Reaction F2(g) + 2e7 Cl₂(g) + 2e7 MnO₂(s) + 4H+ (aq) + 2e7 NO3(aq) + 4H+ (aq) + 3e¯ Ag+ (aq) + e Fe³+ (aq) + e O₂(g) + 2H₂O() + 4e Cu²+ (aq) + 2e7 2H+ (aq) + 2e7 N₂(g) + 5H+ (aq) + 4e¯ Fe2+ (aq) + 2e7 2+ Zn²+ (aq) + 2e 2H₂O() +2e7 Na+ (aq) + e 2F (aq) 2C1 (aq) 2+ Mn²+ (aq) + 2H₂O(l) NO(g) + 2H₂O(l) Ag(s) Fe²+ (aq) 4OH(aq) Cu(s) H₂(g) N₂Hs+ (aq) Fe(s) Zn(s) H₂(g) + 2OH(aq) Na(s) Strength of reducing agent E half-cell (V) +2.87 +1.36 +1.23 +0.96 +0.80 +0.77 +0.40 +0.34 0.00 -0.23 -0.44 -0.76 -0.83 -2.71

An aqueous FeF₂ solution is electrolyzed under 1 bar pressure using platinum electrodes. (a) Write the half-reactions predicted to occur at the anode and cathode, based on the standard cell potentials given below. Half-reaction at anode: Half-reaction at cathode: + + Standard Reduction Potentials (Volts) at 25 °C 2 F (aq) F₂(g) +2 e 2.870 O₂(g) + 4 H3O*(aq) + 4 e¯ →→ 6 H₂O(l) 1.229 2 H₂O(1) +2 eH₂(g) + 2 OH(aq) -0.828 Fe²+ (aq) + 2 e Fe(s) + (b) What is the expected decomposition potential? -0.440 +

Alkaline Batteries (AA/AAA) Cathode: 2 Mno2 (s) + H2O (I) + 2 e→ Mn,O3 (s) + 2 OH: (aq) +3 · Anode: Zn (s) + 2 OH (aq) → ZnO (s) + H2O (I) + 2 e- · Anode: Zn; Cathode: MnO2 (s) What is the overall balanced equation for the redox reaction occurring in an alkaline (AA/AAA) battery?