Ch 30
No description yet. This curated deck is ready for daily study.
Card preview (17)
What are two types of electrochemical cells?
• Galvanic (Voltaic) - Electrolytic
Galvanic cells have what kind of reactions?
Spontaneous, with -∆G
Electrolytic cells have what kind of reactions?
Nonspontaneous, with ∆G
The anode is the site of
Oxidation
The cathode is the site of
Reduction
Describe Galvanic cells
They supply energy and are used to do work
In Galvanic cells, how do the electrons flow?
Away from the anode to the cathode
Opposite to Galvanic cells, electrolytic cells are
In need of energy to induce a reaction
The anode of an electrolytic cell is considered as
Positive
The anode of an galvanic cell is considered as
Negative
The number of moles exchanged in an electrochemical cell can be determined from the
Balances reaction for that cell
What is the equation which determines the moles of electrons transferred by electrochemical cell?
i x t = n = F
The more positive the potential of a chemical species, the more likely it is to
Be reduced
When two half-reactions occur in the same system, which one occurs in reverse as oxidation?
The lower reduction potential
∆G is the measure of spontaneity in a reaction and the useful work produced. What is the Gibbs Free Equation?
∆G = -nFEcell
∆G is expressed in what unit?
J
What is the Nernst Equation?
E cell = E˚cell - (RT/nF) * ln Q