Practice: will the reaction be spontaneous? If not write the spontaneous direction, and calculate the Ecell. Sketch the cell and write the line notation of the spontaneous reaction. Zn + Ca2+ → Zn2+ + Ca a) Spontaneous b) Not spontaneous c) Not sure Zn2+(aq) + 2e Zn(s) -0.76 Cr³+ (aq) + 3e →Cr(s) -0.73 2 H₂O(l) + 2e H2(g) + 20H(aq) -0.83 Mn2+(aq) + 2e Mn(s) -1.18 Al3+(aq) + 3e Al(s) -1.66 Mg2+(aq) + 2e Mg(s) -2.37 Na+(aq) + e Na(s) -2.71 Ca²+(aq) + 2e¯ →→→ Ca(s) -2.76

A voltaic cell is constructed using the reaction: Fe(s) + Cu²+ (aq) Fe²+ (aq) + Cu(s) Calculate the emf of this cell, when [Cu²+] = 0.010 M and [Fe²+] = 1.0 M. (A) 0.67 V (B) 0.73 V (C) 0.79 V (D) 0.85 V (E) 0.91 V

Practice: will the reaction be spontaneous? If not write the spontaneous direction, and calculate the Ecell. Sketch the cell and write the line notation of the spontaneous reaction. Zn + Ca2+ → Zn2+ + Ca a) Spontaneous b) Not spontaneous c) Not sure Zn2+(aq) + 2e Zn(s) -0.76 Cr³+ (aq) + 3e Cr(s) -0.73 2 H₂O(l) + 2e Mn2+( Al3+(aq) + 3e Mg2+(aq) + 2e H2(g) +20H(aq) -0.83 +(aq) + 2e¯ Mn(s) -1.18 Al(s) -1.66 Mg(s) -2.37 Na+ (aq) + e Na(s) -2.71 Ca2+ (aq) + 2e →Ca(s) -2.76

10. Balance the reaction in acidic aqueous solution using the half-reaction method: Zn (s) + MnO4- (aq) → MnO2 (s) + Zn+2 (aq) Red ½ rxn       Ox ½ rxn       Overall balance redox reaction   11. Compute ∆G for the Redox reaction in 10 above. I would like you to anwser number 11. I already have the anwser for number 10.

The answer is A but I dont know how to get it

The following reaction is ___________ under standard conditions. Al (s) + Fe3+ (aq)  →  Fe (s)  + Al3+ (aq)     spontaneous     nonspontaneous     neither of these

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is __________ V. Zn (s) + Cu2+ (aq) → Cu (s) + Zn2+ (aq)

a)Which redox reaction is not spontaneous under standard conditions? a 2 Fe + 3 Br2 → 2 Fe3+ + 6 Br− b 2 Fe3+ + 3 Ni → 2 Fe + 3 Ni2+ c Fe2+ + Ni → Fe + Ni2+ d 2 Fe3+ + Ni → 2 Fe2+ + Ni2+ e All of the above reactions are spontaneous b)Consider the following half-reaction: BrO- → Br- The balanced equation for the half-reaction in basic conditions is:  a BrO- + 2H+ + 2e- → Br- + H2O b BrO- + 2H+ → Br- + H2O + 2e- c BrO- + H2O → Br- + 2OH- + 2e- d BrO- + H2O + 2e- → Br- + 2OH-

What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the F2 pressure is 8.22×10-4 atm, the F concentration is 1.46M, and the Cr³+ concentration is 1.01M? 3F₂(g) + 2Cr(s)—6F¯(aq) + 2Cr³+ (aq) Answer: V The cell reaction as written above is spontaneous for the concentrations given: