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Topic: Redox

Topic: Redox. Aim: How can you ID redox reactions? Do Now: What is the oxidation # of Mn in KMnO 4 ? HW :. Recognizing Redox Reactions. Not all reactions are REDOX reactions Redox Reactions have both oxidation & reduction occurring simultaneously. Recognizing Redox Rxns.

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Topic: Redox

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  1. Topic: Redox Aim:How can you ID redox reactions? Do Now: What is the oxidation # of Mn in KMnO4? HW:

  2. Recognizing Redox Reactions • Not all reactions are REDOX reactions • Redox Reactions have both oxidation & reduction occurring simultaneously

  3. Recognizing Redox Rxns • If there’s a change in oxidation # for an element, it’s a redox rxn • Look for: free element on one side of the arrow and that same element is in a compound or an ion on the other side of the arrow, then it is a redox reaction.

  4. Examples Which equation represents a redox reaction? 1) 2Na+ + S2- Na2S 2) H+ + C2H3O2­ HC2H3O2 3) NH3 + H+ + Cl- NH4+ + Cl- 4) Cu + 2Ag+ + 2NO3- 2Ag + Cu2+ + 2NO3- Which is a redox reaction? 1) H+ + Cl-  HCl 2) NaOH + HCl  NaCl + H2O 3) Fe + 2HCl  FeCl2 + H2 4) MgO + H2SO4 MgSO4 + H2O

  5. Examples Which equation represents a redox reaction? • HCl + KOH  KCl + H2O • 2HCl + CaCO3 CaCl2 + H2O + CO2 • 4HCl + MnO2 MnCl2 + 2H2O + Cl2 • 2HCl + FeS  FeCl2 + H2S Which equation represents a redox reaction? • Zn + 2HCl  ZnCl2 + H2 • H2O + NH3 NH4+ + OH- • Zn(OH)2 + 2HCl  ZnCl2 + 2H2O • H2O + H2O  H3O+ + OH-

  6. Revisiting Table J(hello, old friend) • Compares activity of metals & nonmetals Metals @ top MOST EASILY OXIDIZED LEAST EASILY REDUCED Metals @ bottom LEAST EASILY OXIDIZED MOST EASILY REDUCED What does this mean?

  7. Nonmetals @ top • MOST EASILY REDUCED • LEAST EASILY OXIDIZED • Nonmetals @ bottom • LEAST EASILY REDUCED • MOST EASILY OXIDIZED • What does this mean?

  8. Rules • Metals or nonmetals higher on Table J replace metals or nonmetals below them that are tied up in compounds. • SPONTANEOUS reaction

  9. Examples 1. Which metal is less active than Mg? 1) Al 2) Ba 3) Ca 4) Rb • Which metal has lower activity than H2­? 1) Al 2) Na 3) Cu 4) Fe 3. Tell whether the reaction will occur spontaneously or not: A. F2 + 2NaCl  ? B. K + LiCl  ? C. Ca + MgCO3 ? D. Cl2 + 2NaF  ?

  10. Examples Which reaction will take place spontaneously? 1) Ni2+ + Pb  Ni + Pb2+ 2) Au3+ + Al  Au + Al3+ 3) Sr2+ + SnSr + Sn2+ 4) Fe2+ + Cu  Fe + Cu2+ Which is most easily oxidized? 1) Li 2) K 3) Ca 4) Na Which is least easily oxidized? 1) Ca 2) Ni 3) Cu 4) Au

  11. IMPORTANT To find properties of the ION, take the properties of the ELEMENT and REVERSE them. Ex: Li is MOST easily OXIDIZED SO: Li+ is ___________ easily _____________ Ex: F2 is MOST easily REDUCED SO: F- is ___________ easily ____________ Ex: Which of the following ions is most easily oxidized? 1) F- 2) Cl- 3) Br- 4) I-

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