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Topic: Redox & Electrochemistry

Topic: Redox & Electrochemistry. Aim: What are oxidation & reduction, and how do you recognize the processes? DN: Have you ever heard the word “oxidized”? What does it mean to you ?. Oxidation & Reduction. Paired reactions – one can’t occur without the other Why they’re called “REDOX”

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Topic: Redox & Electrochemistry

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  1. Topic: Redox & Electrochemistry Aim: What are oxidation & reduction, and how do you recognize the processes? DN: Have you ever heard the word “oxidized”? What does it mean to you?

  2. Oxidation & Reduction • Paired reactions – one can’t occur without the other • Why they’re called “REDOX” • Many essential and practical reactions

  3. Oxidation & Reduction • Oxidation: a loss of electrons • What happens to charge? • Reduction: a gain of electrons • What happens to charge? • Electron(s) are transferred from one ‘species’ (substance) to another • Get ready for the life-changing moment du jour…

  4. REMEMBER THIS! LEO says GER GER!

  5. LEO Lose Electrons Oxidized Charge of element becomes more positive GER Gain Electrons Reduced Charge of element becomes more negative LEO says GER?!

  6. Examples of Oxidation LEO • X X+2 • X+2 X+5 • X-3  X-1 + 2e- + 3e- + 2e- Charges aren’t balanced without writing in the electrons!! (Law of Conservation of Mass, Energy, & CHARGE!)

  7. Examples of Reduction GER X  X-1 X+4 X+2 X-1  X-3 1e- + 2e- + 2e- + Charges aren’t balanced without writing in the electrons!! (Law of Conservation of Mass, Energy, & CHARGE!)

  8. Examples • Na  Na+1 + 1e- • N-3 + 2e-  N-5 • Cl + 1e-  Cl-1 • Fe+2  Fe+3 + 1e- • What do they have in common? Why does this make sense?

  9. Oxidizing & Reducing Agents • Oxidizing agent • Substance that gets reduced • (allows oxidation to happen to a substance) • Reducing agent • Substance that gets oxidized • (allows reduction to happen to a substance)

  10. Example • Mg + O  Mg+2 + O-2 • What is being oxidized? • What is being reduced? • What is the oxidizing agent? • What is the reducing agent?

  11. Example • Cr+7 + Al  Al+3 + Cr+4 • What is being oxidized? • What is being reduced? • What is the oxidizing agent? • What is the reducing agent?

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