Redox Rxn

Chemical Changes ,[object Object],[object Object]

What is the difference between this two coins? ,[object Object],http://tides.sfasu.edu:2006/cdm4/item_viewer.php?CISOROOT=/StoneFort&CISOPTR=207&CISOBOX=1&REC=17

Corrosion ,[object Object],[object Object]

Oxidation - Reduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How to prevent corrosion? ,[object Object],[object Object],[object Object]

Electroplating metals demonstration 6 V battery + - Copper sulphate solution Cooper coin clip 1¢ A cooper coated clip !

Oxidation Numbers Number assigned to a combined atom according to a set of arbitrary rules, # of electrons gained or lost. pg. 12 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Mn = +7 O = -2

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Oxidation Numbers

[object Object],Redox reaction pg.14

[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],____________________________________________________________ -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 decrease in oxidation state: more negative (Gain of electrons) (less positive)

Examples Al + Cl 2  AlCl 3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],In any reaction involving oxidation and reduction there must be a species giving electrons and another species gaining electrons. Hence the term redox reaction.

[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Redox Rxn

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Redox Rxn