7 electrochemistry - Electrochemistry Oxidation loss of...

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Electrochemistry Oxidation – loss of electrons LEO OIL Reduction – gain of electrons GER RIG Oxidation States 1) Elements in their elemental form are in the zero oxidation state. 2) Group 1 metals are +1 and Group 2 metals are +2. 3) Hydrogen is +1 except when bonded to metals (when it’s –1). 4) The most electronegative elements get their typical ox state. 5) The last element not assigned balances the charge of the compound/ion. Balancing Redox Rxns MnO 4 - (aq) + I - (aq) Mn 2+ (aq) + I 2(s) Oxidizing Agent (Oxidant) – species that is reduced Reducing Agent (Reductant) – species that is oxidized Elements or compounds are oxidized/reduced whereas only compounds act as reducing/oxidizing agents). Electrochemical Cells a) The anode is always the site of oxidation (an ox) b) The cathode is always the site of reduction (red cat) c) Electrons always flow from anode to cathode d) Anions flow to the anode and cations to the cathode through the salt bridge e)
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