test 04 review - Dr. McCord CH302 OVERVIEW for EXAM 4 page...

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Textbook Chapters for Exam 4 Chapter 11, sections 1-5 and 7 (no sections 6 and 8). Chapter 15 (except section 7). You’re responsible for any material covered in class whether it was on the homework or not. This review sheet covers most everything we have done. Also remember that no equations are given on the exams so you need to know them . Values for equilibrium constants and any standard potentials are given where needed. Chapter 11 - Electrochemistry Remember your redox chemistry - Chapter 4. Know the basic concepts that were presented on homework 12 (Redox Rxn Review). Know how to assign oxidation numbers to all the elements in a given formula. Know how to balance a redox equation in acid. What is the difference in oxidation and reduction. KNOW your definitions here! Know what a redox reaction is. What is being oxidized and what is being reduced? What is the oxidizing agent and what is the reducing agent? What is a half-reaction? Why is it so useful? Know how to write half-reactions for both oxidations and reductions. Know how to combine 2 half-reactions to give an overall cell reaction. (electron balance?) This is essentially the same as what was stated above except that in electrochemical cells we run the 2 half-reactions in 2 different locations - that is we have them physically separated. Know the difference in voltaic vs electrolytic cells Know how to write half-reactions for both oxidations and re- ductions. Know how to combine 2 half-reactions to give an overall cell reaction. (electron balance?) Know how to draw a picture of both a voltaic and an electro- lytic cell if given the shorthand notation. anode | anodic solution || cathodic solution | cathode where the "|" are phase changes and "||" is a salt bridge. What's the sign convention used for the cathode and anode? What's the significance of the SHE? What's an inert electrode? Used for what? Pt in the SHE, graph- ite in a dry cell Know what standard conditions are and how it is symbolized (same as always). Calculations, how to get: E 0 for any half-reaction (look it up in a table if it is not given in the question itself). E 0 for any overall cell reaction. E cell 0 = E red 0 + E ox 0 remember that Zumdahl uses cathode potential minus the anode potential which is the same as above. My oxidizing po- tential is the “minus the anode potential”. Bottom line is that you always leave the reduction reaction as is off the table but
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This note was uploaded on 06/15/2010 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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test 04 review - Dr. McCord CH302 OVERVIEW for EXAM 4 page...

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