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chem lecture ch19

QuestionAnswer
Galvanic cells they use redox reactions to generate electricity. The energy comes from a spontaneous redox reaction, and the electron transfer is forced to take place through a wire.
cathode is the electrode at which reduction takes place
anode is the electrode at which oxidation takes place
Cations move towards the _____? cathode
Anions move towards the _____? anode
salt bridge a tube filled with a solution containing ions not involved in the cell reaction.
potential magnitude of this ability is called the potential in ( V ). The volt is the amount of energy in joules, that can be delivered per coulomb ( C ). So, a charge flowing under a potential of one volt can deliver one joule of energy per coulomb. 1 V = 1 J / C
cell potential ( Ecell ) The maximum potential a galvanic cell can generate. It depends on the composition of the electrodes, the concentrations of the ions in the half-cells and the temperature.
Reduction potential measure of the tendency of reduction half-reactions to occur. The magnitude of this tendency is expressed by the half-reaction’s reduction potential.
E°cell formula E°cell = E°Ag+ - E°Cu2+
the calculated standard cell potential for the spontaneous reaction is always ________? posotive
cell potential formula G = maximum work = n F Ecell n=number of moles of electrons transferred, F=Faraday constant The Faraday constant F is equal to the coulombs of charge equivalent to one mole of electrons (9.65 104 Coulombs per mole of electrons).
If G is negative, which corresponds to a positive value of Ecell, the reaction will occur ____________? spontaneously
pH-electrode a galvanic cell with a potential, that is proportional to the proton concentration in the solutions into which it is immersed.
In an electrolytic cell: Cathode is _______? Anode is ________? cathode is negative anode is positive
Created by: jsherm82