Electrochemistry, Answers

Electrochemistry, Answers

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Electrochemistry Oxidation & Reduction Reactions A --7- A~ + e.- Oxidation: A ~ / decreases) in oxidation number; (~ ~ f electrons Reduction: An (increase/d ~ in oxidation number; ~ oss) of electrons A. -1 + e._ - ~ A Rules for calculating oxidation number: Uncharged free elements= 0 (:)1< \ 0a~D' ~ ' s. -=--:> bCI.\GI.nc.e c.,Y"\~ s. ~~c..:\~ o Ex: Cu, Fl 2 Single atom ion= ionic charge ""-f~~ ~ncx;\. c;_ -\-CI..X)\ .... e. o Ex: NaCI C ~:'T' I ' l U ...J-\ - Covalent compounds= pretend ionic, use electronegativity ..:::i) c\DC\-\- O..c~O..\\'-( Vuv...L- o Element closest to upper right is fluorine. , ~0.~ o In most cases: ~ '- F= -1 ALWAYS / \-\ z._ 0 I-\ ·. -r \ 0=-2;H=+l,CI=-1 l C\ 'G p : -' e1 '"'"3 (-i)~)~3 o Ex: H20, CIF3 -t\ - 'L Identify the oxidation numbers of all the elements in the following compounds: 3 -\ -\ F/ ~ N3 AICI 3 I ' ... .> ...-\ 0 c1/ ..... ;mo\ .r I ~ -'- ~~v )tv ~~l~t ~ Cr~ · Na2S04 · ~ \>z.lA-J J,(..,) "-L.l'\-' ) . .... s -rz_ --s N02 - / '-2(<~) -+'3 ---+ )uo ,_, ..-z_ How tQ Balance Oxidation-Reduction Reactions VU.. Write the half-reactions and balance elements --..;> wv'- · C.I'"' 0+--~~ · c.J"-. ~ : ~vC-"("•c;."\ - ~ Balance each reaction w/ e- v-'3 ). Add two reactions; use multipliers if necessary v4) Balance 0 using H 2 0; Balance H using H+ 5} Check by counting atoms and charges Example: Balancing the following reaction· / HN02 + 1 1 .7 NO+ 1 - 0 . _. j \ \ I ' 2 -t-\ .t) --z.-1 .. 1. -1. r~u,-, .;;_J H ~ o"- + -e- --"> N 0 ""~ ')< L ~ •I - ·~ I / +3 - ~ D'i' o\£A1"'o, ..... ·.
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