39. The reduction potential of the saturated calomel electrode is +0.242 V above the standard hydrogen electrode. The reduction potential of an electrode measured relative to a saturated calomel electrode is -0.694 V. What is the reduction potential of this same electrode relative to the standard hydrogen electrode? (A) -0.936 V (B) -0.452 V (C) 0.242 V (D) 0.452 V (E) 0.936 V

39. The reduction potential of the saturated calomel electrode is +0.242 V above the standard hydrogen electrode. The reduction potential of an electrode measured relative to a saturated calomel electrode is -0.694 V. What is the reduction potential of this same electrode relative to the standard hydrogen electrode?
(A) -0.936 V
(B) -0.452 V
(C) 0.242 V
(D) 0.452 V
(E) 0.936 V

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統計： A(0), B(0), C(1), D(0), E(1) #3252581

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4. A strip of copper is placed in a 1 M solution of copper nitrate, and a strip of silver is placed in a 1 M solution of silver nitrate. The two metal strips are connected to a voltmeter by wires, and a salt bridge connects the solutions. The following standard reduction potentials apply: Ag+(aq) + e- → Ag(s) E° = +0.80 V Cu2+(aq) + 2e- → Cu(s) E° = +0.34 V When the voltmeter is removed and the two electrodes are connected by a wire, which of the following does .not. take place? (A) Negative ions pass through the salt bridge from the silver half-cell to the copper half-cell. (B) Some positive copper ions pass through the salt bridge from the copper half-cell to the silver half-cell. (C) The silver electrode increases in mass as the cell operates. (D) Electrons flow in the external circuit from the copper electrode to the silver electrode. (E) There is a net general movement of silver ions through the salt bridge to the copper half-cell.

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