Chapter-14-Notes

Chapter-14-Notes - Chapter 14 Fundamentals of...

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Chapter 14 Fundamentals of Electrochemistry page 1 Ch. 14 Fundamentals of Electrochemistry Electrochemistry (corrosion, galvanic and electrolytic cells) Electrochemical deposition processes electroplating electroless deposition (for advanced integrated circuit interconnects and magnetic data storage thin-film heads) Electrochemical energy systems (batteries, fuel cells, photovoltaics). Electrochemical analytical methods , e.g., potentiometry and voltammetry Advanced sensors, e.g., chem-FETs , chem-SETs Modern approaches, e.g., ultramicroelectrodes, modified electrodes, and scanning probe methods
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Chapter 14 Fundamentals of Electrochemistry page 2 Electrochemistry Objectives •Be familiar with the concept of oxidation state and the methods of assigning formal oxidation states to elements in a compound. •Understand the concept of oxidation and reduction, of half reactions and the use, derivation, manipulation and balancing of redox equations. •Be familiar with the operation of a galvanic (voltaic) cell and with the concepts of electrodes, salt bridges, half-cell reactions, net cell reaction and cell diagrams. •Be familiar with the definition of the standard potential, E ° , for a half reaction. •Describe the standard hydrogen electrode (SHE) and explain how its potential relates to other standard electrode potentials.
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Chapter 14 Fundamentals of Electrochemistry page 3 Electrochemistry Objectives (cont.) •Use tabulated E ° values to predict the values of E cell for an oxidation/reduction reaction and determine conditions under which certain species are likely to react. •Decide from E ° and E cell values whether or not a reaction will be spontaneous under a given set of conditions. •Quantitatively and qualitatively predict the effect of varying conditions (concentrations and gas pressures) on values of E cell . •Know and be able to use equations that relate G , E ° , E cell , and K . •Use Faraday’s laws to relate the quantity of chemical change produced by a given amount of electric charge. •Perform stoichiometric calculations based on oxidation/reduction reactions.
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Chapter 14 Fundamentals of Electrochemistry page 4 Basic Concepts I. Definitions Redox ( red uction- ox idation) reactions involve the transfer of electrons from one species to another oxidation : removal of electrons reduction : addition of electrons oxidizing agent (oxidant) takes electrons ( i.e. is reduced) reducing agent (reductant) gives electrons ( i.e. is oxidized)
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Chapter 14 Fundamentals of Electrochemistry page 5 Step 1. Write the unbalanced redox reaction. Step 2. Separate the reaction into its two half reactions (don't worry about electrons yet). Step 3.
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This note was uploaded on 10/26/2008 for the course CHEM 300L taught by Professor Flood,haw during the Fall '08 term at USC.

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Chapter-14-Notes - Chapter 14 Fundamentals of...

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