Chem 241 Summer 20106/9/20101DefinitionsElectrochemistry is the use of electricity to:»make chemical measurements1»drive chemical reactionsDefinitions - ElectricityBasics of electricity»unit of charge - coulomb (C) b l fhiti2»symbol for charge in an equation - q»1 electron = 1.60217733 x 10-19C»1 mole of electrons = a Faraday (F)»F = 9.6485309 x 104C/mole»q = nFDefinitions - ElectricityCurrent - 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 = workDefinitions - ElectricityWork = Eq»Work (joules, J)E (lt )4»E (volts)»q (coulombs)Work = -G = EqG = -nFEDefinitions - ElectricityOhm’s law»V = IRVpotential difference (volts)5V - potential difference (volts)I - current (amps)R - resistance (ohms)P = VI = I2R P = Power (watts, J/s)Definitions - Galvanic CellA galvanic cell uses a spontaneous chemical reaction to generate electricity6one 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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