FIU CHM 4130 - Chapter 22 Xiao_Electrochemistry_2018 (93 pages)

Previewing pages 1, 2, 3, 4, 5, 6, 43, 44, 45, 46, 47, 48, 49, 88, 89, 90, 91, 92, 93 of 93 page document View the full content.
View Full Document

Chapter 22 Xiao_Electrochemistry_2018



Previewing pages 1, 2, 3, 4, 5, 6, 43, 44, 45, 46, 47, 48, 49, 88, 89, 90, 91, 92, 93 of actual document.

View the full content.
View Full Document

Unformatted text preview:

Electrochemistry Theory The Scope of Electrochemistry Electrochemistry provide information about activities rather than concentrations of chemical species Battery Corrosion Electrolysis Electroanalysis Electrochemical Cells Consist of two electrical conductors immersed in an electrolyte solution Generally contain External wires electrons carry current Conducting electrodes metal carbon Ion solutions ions carry current Interfaces or junctions A complete electrical circuit Electrochemical Cells Galvanic cell a cell that produces electrical energy Electrolytic cell a cell that consumes electrical energy Electrochemical Galvanic Cells Copper Cu wants to ionize more than Silver Ag Cl K Open circuit no current ow measure poten3al Closed circuit current ow measure current Oxida3on occurs at the anode AnOx reduc3on occurs at the cathode RedCat Net reac3on Cu s 2Ag Cu2 2Ag s Electrochemical Electrolytic Cells Net reac3on Cu2 2Ag s Cu s 2Ag Conduction in an Electrochemical Cell Electrons serve as carriers e g moving from Cu through the conductor to the Ag In the solution electricity involves the movement of cations and anions In the salt bridge both chloride and potassium ions move At the electrode surface an oxidation or a reduction occurs Cathode the electrode at which reduction occurs Anode the electrode at which oxidation occurs Galvanic cell vs Electrolytic cell Galvanic cell 1 Requires no potential voltage input Electrolytic cell 1 Requires potential voltage input 2 The voltage becomes smaller and it ultimately reaches 0V when the system achieves equilibrium 2 The potential voltage input the cell potential must be 0 for the reactions to occur 3 The cell potential is positive produce electrical energy 3 The cell potential is negative consume electrical energy What happens at the electrode surface Electrons are transferred at electrode surface by redox reac2ons Occur at liquid solid interface solu2on electrode An electrical double layer is formed Tightly bound inner layer



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Chapter 22 Xiao_Electrochemistry_2018 and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Chapter 22 Xiao_Electrochemistry_2018 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?