CHEM 100 Spring 2023 Exam 2 Free Response Section (30 points)

  1. Consider the following galvanic cell. Based on the electron flow,
    1. Indicate which electrode will be the anode (electrodes are labeled as 1 and 2) (0.5 points). Explain why.
    2. Indicate which electrode will be the cathode (electrodes are labeled as 1 and 2) (0.5 points). Explain why.
    3. If Pt and Au were the electrodes, which would be the anode? Which would be the cathode? Why? Please refer to the electronegativity chart on page 1 (2 points).
    4. Which is the correct half reaction for Pt (0.5 points)?

Pt2+ + 2e– → Pto

Pto – → Pt2+ + 2e–

    1. Which is the correct half reaction for Au (0.5 points)?

Au3+ + 3e– → Auo

Auo – → Au3+ + 3e–

    1. Write the balanced overall redox reaction for the Pt and Au Galvanic Cell. Please show your work. How many electrons are transferred (3 points)?