Chem 241 Summer 2010
6/9/2010
1
Definitions
Electrochemistry is the use of
electricity to:
»make chemical measurements
1
»drive chemical reactions
Definitions - Electricity
Basics of electricity
»unit of charge - coulomb (C)
b l f
h
i
ti
2
»symbol for charge in an equation - q
»1 electron = 1.60217733 x 10
-19
C
»1 mole of electrons = a Faraday (F)
»F = 9.6485309 x 10
4
C/mole
»q = nF
Definitions - Electricity
Current - quantity of charge flowing
through a circuit per second
»C/second = ampere (amp A)
3
»C/second = ampere (amp, A)
Difference in electrical potential (E)
is measured in volts (V)
moving a charge from 1 electrical
potential to a higher potential = work
Definitions - Electricity
Work
= Eq
»Work (joules, J)
E (
lt )
4
»E (volts)
»q (coulombs)
Work = -
G = Eq
G = -nFE
Definitions - Electricity
Ohm’s law
»V = IR
V
potential difference (volts)
5
V - potential difference (volts)
I - current (amps)
R - resistance (ohms)
P = VI = I
2
R
P = Power (watts, J/s)
Definitions - Galvanic Cell
A galvanic cell uses a spontaneous
chemical reaction to generate
electricity
6
one reactant must be oxidized, i.e.
lose an electron(s)
one reactant must be reduced, i.e.
gain an electron(s)

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