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Oxidation and Reduction!

Oxidation and Reduction!. Aka: Redox. Oxidation and Reduction is the concept that helps us understand how/why elements gain/ lose electrons An important Mnemonic is: LEO says GER Lose electrons= oxidation, Gain electrons = Reduction ( OilRig …) idonlike.

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Oxidation and Reduction!

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  1. Oxidation and Reduction! Aka: Redox

  2. Oxidation and Reduction is the concept that helps us understand how/why elements gain/ lose electrons • An important Mnemonic is: • LEO says GER • Lose electrons= oxidation, Gain electrons = Reduction (OilRig…) idonlike

  3. Oxidation state/number • The oxidation number of an element is *kind of like the charge. • We have learned that certain elements always have “a” charge! • Well… Guess What!!!! (That’s a Bingo!!!) • Sometimes the charges of elements can change, and/or be different from what we expected. ( yes… that IS exciting!!!)

  4. Oxidation numbers of elements: Oxidation Rules: 1 - oxidation state of a free ( single) element (or diatomic molecule) is 0 Na0, Fe0, N20, etc. 2 - oxidation number of a monatomic cation is same as its charge ( group 1, 2 metals in particular!) +1, +2 3 – normal oxidation number of Hydrogen is +1 but… H -1 in metal hydrides NaH, MgH2,

  5. 4 – oxygen is usually -2, but in peroxides it is -1 Na2O, MgO, H2O, Na2O2, MgO2,H2O2, 5 – a lot of elements- especially transition metals and most of the non metals can have lots o’ different oxidation numbers And that sounds fascinating … doesn’t it? (yes!)

  6. *The sum of all oxidation numbers in a compound will = 0 , kinda like what we have been doing with ionic compounds ( examples!) And : NO, NO2,N2O5, etc…. The sum of all oxidation numbers in a polyatomic ion will be the charge of the P.A. ion (examples)…

  7. Examples: Some, like transition metal ionic compounds you can do! Examples: Molecular compounds we have to figure out, based on rules. ( examples…) Polyatomic ions… we have to figure out based on rules… (examples)

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