Aim:How are oxidation states assigned? QQ:None! Do Now:Painters are employed year-round to pain the cables, towers and supports on the Golden Gate Bridge in San Francisco. Why? Oxidation and Reduction - History Oxidation:combining oxygen with another substance. 4 Fe (s) + 3 O2(g) Fe2O3(s)Reduction:removal of oxygen from a substance CuO (s) + H2(g) Cu (s) + H2O (g) Current Definitions Oxidation:the loss of electrons Reduction:the gain of electrons LEO the lion says GER! Redox Reactions•Involve a change in oxidation states (charges) •Oxidation and reduction will always come in pairs… Determining Oxidation States KMnO41. Assign oxidation states to the elements that only have one possible oxidation state. 2. Multiply the oxidation state by the subscript of the element to find the total charge contributed by that element. 3. All matter is neutral –determine the oxidation state of the remaining element. Practice:Provide the chemical formula and determine the oxidation state of each element in the compound.
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