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Oxidation and Reduction

Oxidation and Reduction. Subtitle. Definition. Oxidation Reduction Reaction (Redox): A reaction in which electrons are transferred from one substance to another. Definition of Redox Reaction. Oxidation cannot occur without reduction Definition of Oxidized:

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Oxidation and Reduction

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  1. Oxidation and Reduction Subtitle

  2. Definition • Oxidation Reduction Reaction (Redox): A reaction in which electrons are transferred from one substance to another.

  3. Definition of Redox Reaction • Oxidation cannot occur without reduction • Definition of Oxidized: 1. Losing of electrons (LEO) 2. Increasing the ox. number, ie: 0 to +1 -2 to -1 3. Gaining oxygen • Definition of Reduced: 1. Gaining of electrons (GER) 2. Reducing the ox. number, ie: -1 to -2 1 to 0 3. Losing oxygen Becoming more positive Becoming more negative

  4. LEO goes GER OxidationReduction IsIs LosingGaining

  5. Example of an electron transfer reaction • 2Mg + O2 2MgO • Mg atom transfers two electrons to each oxygen atom. • As a result 2 Mg atoms become Mg2+ and two oxygen atoms become O2- • Mg loses two electrons • O gains two electrons

  6. Example of an electron transfer reaction

  7. Examples of Oxidation Reduction • When an electron is lost (An electron is found on the product side) there is oxidation • X0 X+1 + e- • When an electron is gained (An electron is found on the reactant side) there is reduction • e- +Y+1  Y0

  8. Examples: start finish • Ex5 Na0Na+1 • Ex6 Fe+3Fe+2 • Ex7 N+1N+2 • Ex8 Mg+2Mg0 +1e- (LEO)oxidized 1e-+ (GER)reduced +1e- (LEO)oxidized (GER)reduced 2e-+

  9. Vocabulary • Whatever is oxidized is called the reducing agent • Whatever is reduced is called the oxidizing agent

  10. Real Examples: start finish • Ex5 Na0Na+1 • Ex6 Fe+3Fe+2 • Ex7 N+1N+2 • Ex8 Mg+2Mg0 oxidized +1e- reducing agent reduced 1e-+ oxidizing agent oxidized +1e- reducing agent reduced 2e-+ oxidizing agent

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