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Chem102-Exam 4

4th-exam

VocabularyDefinition
Electrochemistry The study of the relationship between electricity and chemical reactions
Electrolytic Cells Are nonspontaneous chemical reactions; consumes electrical energy from an external source to cause a nonspontaneous redox reactions to occur
Voltaic Cells Also called galvanic cells are spontaneous chemical reactions; energy released during a spontaneous reaction generates electricity
Cathode Is negative in electrolytic cells and positive in voltaic cells; occurs in reduction reaction
Anode Is positive in electrolytic cells and negative in voltaic cells;occurs in oxidation reaction
Metallic Conduction Both types of cells contain two electrodes connected to an external circuit that provides an electrical connection between systems
Ionic Conduction When circuit is closed, electrons flow from the anode to the cathode; electrodes are connected by an electrolyte, which is an ionic substance or solution that allows ions to transfer between the electrodes, maintaining the system’s electrical neutrality
Standard Electrode Potential The potential of a half-reaction measured against the standard hydrogen electrode under standard conditions
Standard Hydrogen Electrode (SHE) consists of a strip of platinum wire in contact with an aqueous solution containing 1 M H+, which is in equilibrium with H2 gas at a pressure of 1 atm at the Pt-solution interface
Coulomb Is the amount of charge that passes a given point when a current of one ampere flows from one second
Battery A galvanic cell that contains all the reactants needed to produce electricity
Fuel Cell A galvanic cell that requires a constant external supply of one or more reactants in order to generate electricity
Created by: ansecaballero