Electrochemistry Galvanie (Voltaic) cells Oxidation and reduction half reactions

Question

Electrochemistry Galvanie (Voltaic) cells Oxidation and reduction half reactions Anode, Standard reduction potentials Standard cell potential: E- Gibb's free energy change for a cell reaction: &G--nFE; eStrengths a as oxidizing and reducing agents * At standard conditions " Gbbs free energy of an electrochemical cell: aG . G··RT la Nernst equation: At 25 "C, E E-(0.0592 V/n) log Q Standard cell potential and the equlibrium constant at 25 E*·(00592 v/n) log K Electrolysis: Calculation of amount of substance plated out, or time it takes to plate out a given amount · e Sample Questions 1) What is the shorthand notation that represents the following galvanic cell reaction? Fe(s) + Cu(N03)2(aq) Fe(NO3)2(aq) + Cu(z) D) Culs) I Cu(NO3)2(ag) Il Fe(NO3)2(a) I Fe(a) 2) For the reaction: 2 Fe2+taq) + C2(g) 2 Fe3+(aq) +2 ataq), what is the oxidation half-reaction? A) Fe2t(aq) + e. Fe3+(aq) B) Fe2+(aq) Fe3+(aq) + e D) Cl2(g) 2 Cl-(aq) + 2e. and the oxidizing agent is 3) For the reaction in the previous question, the oxidized substance is A) Fe2+; Fe* D) CI2(R): Fe2+ 4) Which of the following can be a shorthand notation for a galvanic cell that has the reaction: 2 Fe2+(aq) + Cl2(g) 2 Fe3+(aq) + 2 Cl.(ag) 5) A galvanic cell consists of one half.cel Curt(ag). What species are produced at the electrodes under standard conditions? I that contains Ag(s) and Ag (ag), and one half-cell that contains Cu(s) and Ag+(aq) + e" Ag(s) Cu2+(aq) + 2 e- Cu(s) E:+0.80 V E= +0.34 V A) Ag(s) is formed at the cathode, and Cu(s) is formed at the anode. B) Ag(s) is formed at the cathode, and Cu2+ (ag) is formed at the anode. C) Cu(s) is formed at the cathode, and Ag (ag) is formed at the anode. D) Cu2+(ag) is formed at the cathode, and Cu(s) is formed at the anode. © Chemistry, 6"ed, McMurry and Fay, Pearson Education, Inc.

Explanation / Answer

1] A - oxidation half cell and reduction half cell

2] B - where eletron is released

3] C - [ oxidizing agent -a substance that tends to bring about oxidation by being reduced and gaining electrons.]

4] A

5] A - since reduction potential of Ag ion is higher it forms at cathode .

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