CHEM 110 - Exam 4 Test Questions All Answered Correct 2025/2026 Updated.

Gibbs free energy - Answer ∆G - the maximum amount of work that can be obtained from a process ∆G at equilibrium - Answer ∆G = 0 The function of a salt bridge - Answer It allows electrical neutrality to be maintained by the flow of appropriate ions between the half-cells In the copper-silver cell, why must the Cu2+ and Ag+ solutions be kept in separate in containers? - Answer Otherwise Ag+ ions would be reduced directly by Cu metal and no external current would be produced. In a galvanic cell, do electrons travel from anode to cathode or from cathode to anode? - Answer The electrons flow away from the anode and towards the cathode. Explain how the movement of the ions relative to the electrodes is the same in both galvanic and electrolytic cells. - Answer Anions move away from the cathode and towards the anode. Cations move away from the anode and towards the cathode. 2Al(s) + 3Sn2+(aq) → 2Al3+(aq) + 3Sn(s). - Answer The cathode is tin metal: Sn2+(aq) + 2e- → Sn(s) The anode is aluminum metal: Al(s) → Al3+(aq) + 3e- What is the standard cell notation that makes use of the spontaneous reactionCo2+(aq) + Zn(s) → Co(s) + Zn2+(aq)? - Answer Zn I Zn2+ II Co2+ I Co What do the positive and negative signs of reduction potentials tell us? - Answer A positive reduction indicates the substance is more easily reduced than the hydrogen ion, and a negative reduction potential means it is more difficult to reduce than the hydrogen ion. A certain electrochemical cell has a cell potential of +0.34 V. Which of the following is a true statement about the electrochemical reaction? - Answer The reaction favors the formation of products and would be considered a galvanic cell. Consider the following reaction: 2Fe2+(aq) + Cu2+ → 2Fe3+(aq) + Cu.