Chapter 18 Key Terms Flashcards
Alkaline Battery
Dry cell battery that employs different half reactions in a basic medium
Ampere (A)
SI unit for electrical current (1 A = 1 C/2)
Anode
Electrode in an electrochemical cell that donates electrons, becomes oxidized
Cathode
Electrode in an electrochemical cell that accepts electrons, becomes reduced
Cell potential
Potential difference between cathode and anode in an electrochemical cell
Corrosion
The gradual oxidation of metals that occurs when they are exposed to oxidation in environment
Dry Cell Battery
A battery that does not contain a large amount of liquid water, often using oxidation of zinc and reduction of MnO2
Electrical Current
Flow of charge
Electrochemical Cell
Decide in which an electric current produces or is created by a chemical reaction
Electrolysis
Process by which electrical current drives a nonspontaneous reaction
Electrolytic Cell
Cell which uses electrolysis
Electromotive Force (emf)
Force resulting in motion of e- due to potential difference
Faraday’s Constant (F)
Charge in Coulombs of 1 mol of electrons. F=96485
Fuel Cell
Voltaic cell using oxidation of hydrogen and reduction of oxygen to provide current
Half Cell
One half of an electrochemical cell
Nernst Equation
Equation relating cell potential of a cell to standard cell potential and Q
Ecell=E*cell-(.0592/n)(log(Q))
Potential Difference
Difference in potential energy per charge unit
Salt bridge
Inverted, U shaped tube containing a strong electrolyte that connects half cells
Standard Cell potential (E*cell)
Cell potential for a system in standard states
Standard Hydrogen Electrode
Half cell consisting of an inert platinum electrode immersed in 1M HCl with hydrogen gas bubbles; standard of potential at 0
Voltaic/Galvanic Cell
Cell that produces electrical current from a spontaneous reaction
