Lecture 20.1- Redox

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Section 20.1 Lecture for Honors & Prep Chemistry

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Lecture 20.1- Redox

  1. 1. Oxidation-reduction (redox) reactions involve the exchange of electrons.
  2. 2. THE HIGHLY ELECTRONEGATIVE oxygen atom takes electrons to form an anion. <ul><li>Fe(s) + O 2 (g)  Fe 2 O 3 (s) </li></ul><ul><li>Iron + oxygen  rust </li></ul>
  3. 3. L oss of E lectrons is O xidation G ain of E lectrons is R eduction <ul><li>LEO the lion says, “GER” </li></ul>b GER
  4. 4. Electrons are transferred from the atom that is oxidized to the atom that is reduced <ul><li>Zn(s) + 2 H +  Zn 2+ + H 2 (g) </li></ul><ul><li>Zinc loses electrons (charge increases) </li></ul><ul><li>Hydrogen ion gains electrons (charge decreases) </li></ul><ul><li>Zinc is oxidized, Hydrogen ion is reduced </li></ul>
  5. 6. Redox reactions always have an oxidation and a reduction. If something is oxidized, something else is ALWAYS reduced. <ul><li>OXIDIZING AGENT (oxidant)- oxidizes another substance and becomes reduced. </li></ul><ul><li>REDUCING AGENT (reductant)-reduces another substance and becomes oxidized. </li></ul>
  6. 9. L oss of E lectrons is O xidation G ain of E lectrons is R eduction b GER

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