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Chapter 20 Oxidation-Reduction Reactions

Chapter 20 Oxidation-Reduction Reactions. Anything in black letters = write it in your notes (‘knowts’). 20.1 – The Meaning of Oxidation and Reduction. Original definitions, still useful…. Oxidation. Combining with oxygen. Reduction. Loss of oxygen.

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Chapter 20 Oxidation-Reduction Reactions

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  1. Chapter 20 Oxidation-Reduction Reactions Anything in black letters = write it in your notes (‘knowts’)

  2. 20.1 – The Meaning of Oxidation and Reduction Original definitions, still useful… Oxidation Combining with oxygen Reduction Loss of oxygen Oxidation cannot occur without reduction.

  3. Circle the substance that is being oxidized CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) 4Fe(s) + 3O2(g) → 2Fe2O3(s) 2Fe2O3(s) + 3C(s) → 4Fe(s) + 3CO2(g) Oxidation Reduction Combining with oxygen Loss of oxygen

  4. Modern definitions, more useful… Oxidation Loss of electrons Reduction Gain of electrons

  5. Helpful acronym… ‘LEO the lion says GER’ ger Loss of Electrons is Oxidation Gain of Electrons is Reduction

  6. Oxidation Loss of electrons Reduction Gain of electrons A substance can be oxidized without reacting with oxygen. heat Mg(s) + S(s) MgS(s) Mg is oxidized because it lost 2 e-

  7. Oxidizing Agent – causes another substance to be oxidized. Reducing Agent – causes another substance to be reduced. Oxidizing Agent 2C + O2 2CO Reducing Agent Carbon is oxidized, oxygen is reduced. The oxidizing agent will always be reduced

  8. Circle the oxidizing agent 2AgNO3(aq) + Cu(s) → Cu(NO3)2(aq) + 2Ag(s)

  9. 20.2 – Oxidation Numbers This section is really a review… Oxidation Number – charge on an ion. Elements & compounds have an oxidation # of zero. +2 -1 0 0 Mg + Cl2 MgCl2 Mg0 Mg+2 + 2e- Loss of e- = oxidation Cl20 + 2e- 2Cl-1 Gain of e- = reduction

  10. These should make sense…don’t write them all down!

  11. What is the oxidation number of each kind of atom in the following ions and compounds? • SO2 b. Na2SO4 c. CO32– d. Cu2S

  12. ASSIGNMENT: • Chapter 20 Worksheet #1

  13. 20.3 – Describing RedoxRxns Not covered…

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