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SCH 401: Electrochemistry Notes

Institution: University

Course: Bachelor of Science

Content Category: lecture notes

Posted By: davidkariuki1010

Document Type: DOCX

Number of Pages: 42

Price: KES 200
 
    

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Summary

Introduction:
Electrochemistry involves a chemical phenomena associated with charge separation or deals with the links between chemical reactions and electricity.

? Processes that convert chemical energy to electrical energy and vice versa.

? Note charge separation often leads to a charge transfer which can occur in solution (homogeneous) or the electrode surface (heterogeneous).
? To ensure electroneutrality, two or more charge transfer
half-reactions (oxidation-reduction; Redox) take place in opposing directions.
? The product of the two electrodes can be separated, if the
cell configuration permits.
.Common Electrochemical Terms:
? Voltaic cell: is an electrochemical device in which electric current is generated as a spontaneous oxidation-reduction reaction taking place in a physically separated oxidation and reduction half-reactions.
? Anode: Is the electrode at which oxidation occurs. Because the anode is the source of electrons in a voltaic cell, it is also called the negative electrode.
? Cathode: Is the electrode at which reduction occurs. It is the receiver of the electrons and is the positive electrode.
? The electric potential: Is the energy per unit charge that flows. For example, if a coulomb is taken as a unit charge and joule as the unit of energy; then an electric potential of 1 volt is defined as 1J/C.
? A voltmeter: measures a difference in electric potential between two points.
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