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241section4-10-6

241section4-10-6 - Chem 241 Summer 2010 Definitions...

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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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