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Gen Chem Chapter 11: Redox
mcat gen chem
28
Chemistry
Undergraduate 4
07/09/2009

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Term
salt bridge
Definition
permits the exchange of cations and anions-- prevents build up of charge on a or c
Term
chose a salt bridge whose ions
Definition
will not react with the electrodes or with the ions in solution
Term
faradays constant
Definition
10^5 C/mol of electrons
Term
anode of a galvanic cell is
Definition
negative
Term
anode of an electrolytic cell is
Definition
positive
Term
cathode of a galvanic cell is
Definition
positive
Term
cathode of an electrolytic cell is
Definition
negative
Term
electrons flow
Definition
anode to cathode
Term
RED ___
Definition
CAT
Term
AN ___
Definition
OX
Term
method for determining reduction potential of a cell as a whole:
Definition
1. write both rxns as reductions (electrons on left)
2. subtract the lower number from the higher one bc the higher one is more likely to be reduced
Term
a higher reduction potential is
Definition
more likely to be reduced
Term
delta G and delta E are ____ related
Definition
oppositely
Term
if Delta G is positive
Definition
delta E is negative
Term
if delta G is negative
Definition
delta E is positive
Term
equation to calculate the total charge transferred:
Definition
IT=nF
Term
nernst equation:
Definition
E= Eo - .592/n (log (Q))
Term
the nernst equation relates the cell's emf to the
Definition
concentration of the species inolved
Term
the nernst equation can be used to determine
Definition
the emf as the reaction progresses or when concentrations deviate from the standard state
Term
Eocell =
Definition
Eo cathode -Eo anode
Term
deltaGo =
Definition
-nFEocell
Term
always use gibbs free energy in joules when dealing with
Definition
faradays constant
Term
potentiometer
Definition
voltmeter that draws no current---gives a more accurate reading of difference in potential between two electrodes
Term
ln of greater than one is
Definition
positive
Term
ln of less than one is
Definition
negative
Term
the more positive the reduction potential the ___ likely the reaction is to occur
Definition
more!
Term
normality =
Definition
number of ions * molarity
Term
mass of an element produced at the cathode or anode of an electrolytic cell varies directly with
Definition
the current!
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