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Redox Reactions

“Oxidation-Reduction Reactions”. Redox Reactions. LEO SAYS GER. Section 15 .1. OBJECTIVES Define oxidation and reduction in terms of the loss or gain of oxygen, and the loss or gain of electrons .

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Redox Reactions

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  1. “Oxidation-Reduction Reactions” Redox Reactions LEO SAYS GER

  2. Section 15.1 • OBJECTIVES • Define oxidation and reduction in terms of the loss or gain of oxygen, and the loss or gain of electrons. • State the characteristics of a redox reaction and identify the oxidizing agent and reducing agent.

  3. LEO SAYS GER • Reduction • Reduction occurs when a substance gains electrons. • GER • Gain of Electrons is Reduction • Oxidation • Oxidation occurs when a substance loses electrons. • LEO • Loss of Electrons is Oxidation

  4. Redox example • LEO • Loss of electrons is oxidation Zn Zn2+ + 2e- • GER • Gain of electrons is reduction Cu2+ + 2e- Cu Oxidation Reduction

  5. Classify the following reaction:S + 2e- S2- • Reduction • Oxidation • Not Sure

  6. Classify the following reaction:Li Li+ + e- • Reduction • Oxidation • Not Sure

  7. Classify the following reaction:2O2- 4e- + O2 • Reduction • Oxidation • Not Sure

  8. Redox Reactions • Redox Reactions are chemical reactions in which one substance is reduced and undergoes reduction while another substance simultaneously is oxidized and undergoes oxidation.

  9. Zn(s) + CuSO4 (aq) Cu(s) + ZnSO4(aq) Zn + Cu2+ + SO42-Zn2+ + Cu+ SO42- • LEO Zn Zn2+ + 2e- • GER Cu2+ + 2e- Cu Oxidation Reduction

  10. Which substance is being reduced?2Al(s) + 3Sn2+ (aq) 3Sn (s) + 2Al3+(aq) • Al • Sn2+ • Sn • Al3+

  11. Which substance is being oxidized?2Al(s) + 3Sn2+ (aq) 3Sn (s) + 2Al3+(aq) • Al • Sn2+ • Sn • Al3+

  12. Which substance is being reduced?2Pb(s) + O2(g) 2PbO(aq) • Pb • O2 • PbO

  13. Which substance is being oxidized?2Pb(s) + O2(g) 2PbO(aq) • Pb • O2 • PbO

  14. Assigning Oxidation Numbers • Learning Goal: Assign and use oxidation numbers to identify elements that are oxidized or reduced.

  15. What is the oxidation number of a Magnesium cation? • +1 • +2 • +3 • 0 • -1 • -2 • -3

  16. In the ionic compound ammonium sulfide, what is the oxidation number of sulfur? • +1 • +2 • +3 • 0 • -1 • -2 • -3

  17. In the ionic compound lithium hydroxide, what is the oxidation number of Lithium? • +1 • +2 • +3 • 0 • -1 • -2 • -3

  18. What is the oxidation number for Cl in the covalent compound NCl3? • +1 • +2 • +3 • 0 • -1 • -2 • -3

  19. What is the oxidation number for N in the covalent compound NCl3? • +1 • +2 • +3 • 0 • -1 • -2 • -3

  20. What is the oxidation number for C in the polyatomic ion carbonate, CO32-? • +1 • +2 • +3 • +4 • -1 • -2 • -3

  21. What is the oxidation number for S in the covalent compound SF6? • +1 • +2 • +3 • +4 • +5 • +6 • -1 • -2

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