Chem 04-10 - Chemistry 102 Test # 3 04/10/08 Exam # 3...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry 102 Test # 3 04/10/08 Exam # 3 covers chapter 18, 19 and 20 1. A voltaic cell is set up using the following half reactions: Reduction: Ag^+(aq) + e- Ag(s) Oxidation: Ni(s) Ni^2+(aq) + 2e- a) Which is the anode and which is the cathode? -Ni is the anode because that is where oxidation occurs and it is the source of the electrons. -Ag is the cathode b) What is the direction of flow in an external wire connecting the two electrodes? Anode (source of e-) Cathode c) What is the overall cell reaction? 2Ag+(aq) + Na(s) 2Ag(s) + Ni^2+(aq) d) Describe the ion flow in a salt bridge (with NaNO3) connecting the cell compartments. Na+ goes to cathode and NO3^- goes to the anode. 2. Write the balanced equations for the following half-reactions. Specify whether each is an oxidation or reduction. a) VO3^-(aq) V^2+(aq) (in acid) b) H2O2(aq) O2(g) (in acid) c) MnO4^-Iaq) MnO2(s) (in base) d) Ag(s) Ag2O(s) (in base) Balancing Redox Equations: 1. Hydrogen balance can be achieved only with H+/H20 (in acid) or OH^-/H20 (in
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

Chem 04-10 - Chemistry 102 Test # 3 04/10/08 Exam # 3...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online