Thinking Like a Chemist About Electrochemistry e - on the move UNIT - PowerPoint PPT Presentation

Thinking Like a Chemist About Electrochemistry e - on the move UNIT 8 DAY 3

What are we going to learn today? Oxidation – Reduction Chemistry Voltaic and Electrolytic Cells Tracking the movement of electrons Quantifying the Voltage

Quiz: Clicker Question 1. The following is a sketch of a voltaic cell. In which direction will the sulfate anions flow? A. Toward the anode B. Toward the cathode C. Depends, could go either way to balance charge 2. Is it possible for the “counter ions” to flow through the external wire to balance the charge? A. Yes B. No

Poll: Clicker Question What is your major? A. Engineering B. Biology C. Chemistry D. Other

While setting up next demo Watch this video snippet…… http://www.learner.org/resources/series26.html?pop=yes&pid=76

Macroscopic Look Conversion of Chemical Energy to Electrical Energy - Electrochemistry

Battery/Potato Clock/Electrochemical Cell What do these things have in common?

Potato Clock Competition Biology vs Chemistry vs Engineering vs Others 1. get potato clock to work 2. explain why/how it works Where does the energy comes from to power the clock?

Use the chart to explain the Potato clock: Movement of electrons and What is acting as anode and What is acting as a cathode.

Zn H + < | || | | > What goes in the blanks for potato clock cell? A) Zn, Zn 2+ , Cu 2+ ,Cu, extra needs to be deleted B) Zn 2+ , Zn, Cu, Cu 2+ , extra needs to be deleted C) Zn, Zn 2+ , H + , H 2 , Cu D) Zn, Zn 2+ , Cu 2+ , Cu, H + , H 2 E) Zn, Zn 2+ , H 2 , H + , Cu

Poll: Clicker Question Battery/Potato Clock/Electrochemical Cell What do these things have in common? A. convert chemical energy to electrical energy B. measurable voltage C. capable of going “dead” D. all of the above

Zn H +

CH302 Vanden Bout/LaBrake Spring 2012

CH302 Vanden Bout/LaBrake Spring 2012

CH302 Vanden Bout/LaBrake Spring 2012

CH302 Vanden Bout/LaBrake Spring 2012

Poll: Clicker Question IF: Zn  Zn 2+ + 2e - E ° = 0.76V THEN: Zn 2+ + 2e -  Zn E ° = ? A. -0.76 V B. 0.76 V C. 0 V D. It can’t be measured.

IMPORTANT INFORMATION LM 34 and 35