Chemistry Notes
Chapters 20-21.
OXIDATION AND REDUCTION
Addresses part of Massachusetts Curriculum Frameworks, content standard 8

•   Oxidation / Reduction Reactions

  Loss of Electrons is Oxidation - - L. E. O. Gain of Electrons is Reduction - - G. E. R. Remember:   LEO says "GER"                         LEO

•   Oxidation states             Solubility + Oxidation states
•   Single-replacement reactions with metals (and H)
•   Redox reactions bet. nonmetals
•   Balancing Redox reactions   - -   half-reaction method:

  Separate oxidation and reduction; balance each separately Balance metals, halogens, and misc. ions first Balance O by adding H2O Balance H by adding H+ Balance the Charge by adding electrons Remember:   "O, H, Charge!" Multiply the half-reactions to balance electrons lost = gained Add the half-reactions and cancel what you can

•   ELECTROCHEMISTRY - Galvanic cells

  ANODE (+)   site of OXidation CATHODE (-)   site of REDuction Remember:   AN OX     RED CAT                     OX

•   Batteries
•   Corrosion
•   Electrolysis

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rev. Aug. 2011

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