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Spectacular Redox Reaction Behavior: Homework 10

This homework assignment focuses on the thermite reaction, combustion, combination redox, exchange, decomposition redox, and biological examples of redox reactions. It also discusses the separation of oxidation and reduction in a cell or battery.

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Spectacular Redox Reaction Behavior: Homework 10

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  1. Homework 10 posted and due Friday 13 April Monday…Ick

  2. 1) Thermite reaction SPECTACULAR REDOX REACTION BEHAVIOR 1)assign oxidation # 0 +3 -2 0 +3 -2 2Alo(s) + Fe2O3 (s)2Fe0 (liq)+Al2O3(s) 2) Who does what? Al Which element oxidized ? Fe Which element reduced ? https://www.youtube.com/watch?v=qqvQwfH_wGQ 3)let’s see the reaction in the `flesh’ (why we don’t do this one in class…)

  3. SPECTACULAR REDOX REACTION BEHAVIOR (continued) Example 2: Combustion 1) Assign Oxidation # (ex. Of variable C oxidation states in organics) 0 +1 -2 +0 +4 -2 +1 -2 C6H10 O5+6O2 6CO2 +5H2O 2) Who does what? C Which element oxidized ? Which element reduced ? O BURN BABY, BURN

  4. SPECTACULAR REDOX REACTION BEHAVIOR (continued) Example 3: Combination redox 1) Assign Oxidation # : 2Na + Cl2 NaCl (table salt) 0 0 +1 -1 2) Who does what? Which element oxidized ? Which element reduced ? 3) Let’s see it https://www.youtube.com/watch?v=Ftw7a5ccubs

  5. SPECTACULAR REDOX REACTION BEHAVIOR (continued) Example 4: Exchange (how chemists tear apart beer cans with their bare if wimpy hands) 0 0 +2 +3 2Al0 + 3Cu2+  2Al3+ + 3Cuo https://www.youtube.com/watch?v=Ftw7a5ccubs 1)Assign oxidation numbers 2) Who does what? Al Which element oxidized ? Cu2+ Which element reduced ?

  6. SPECTACULAR REDOX REACTION BEHAVIOR (continued) EXAMPLE 5: Decomposition redox: aka The DEATH TO SKITTLES REACTION And now, the dangerous, scary In-class demo… 0 +1 -2 +1 +7 -2 +1 -2 +4 -2 +1 -1 C12H22O11 + 8KClO3 11H2O + 12CO2 + 8KCl Red Ox

  7. Example 6: Some Final, in-class biological examples 0 +1 -2 0 +4 -2 +1 -2 C6H12O6 + 6O26 CO2 +6H2O Respiration https://www.youtube.com/watch?v=JogVLCzOW0c Volunteer to demo (mole $$ !)

  8. One other unique and highly useful feature of redox reactions… The oxidation and reduction can be separated in space and you can still run the reaction as a `cell’ or ‘battery’

  9. Example: Cu-Mg cell The complete redox reaction Gains 2e- Cu2++ Mgo Cuo +Mg2+ Loses 2e- Reduction half reaction: Cu2+ +2e- Cuo cathode Oxidation half reaction: MgoMg2+ +2e- anode Cu2++ Mgo Cuo +Mg2+

  10. The experimental set-up of (Mg|Mg 2+ ||Cu2+ |Cu) cell LOAD Electron flow out of anode Mg0Mg2+ +2e- NaCl bridge Cl- Na+ anode cathode Cu2+ +2e-Cuo Oxidation Reduction

  11. e- out e- in ~1.5 V Cu+2| Cu Mg|Mg2+ OX RED The Potato clock relies on O2 to cause Cu to oxidize to CuO which dissolves to form Cu+2(aq). Any `juicy’ vegetable or fruit can serve as electrolyte source

  12. Ford Focus all electric car High surface area lithium ion batteries

  13. Power cycle – what happens as you drive Key Chemistry trick: LOAD +1 0 Lix C6 xLi+ + 6C + xe- Anode (left side =ox) 0 +1 Li1-xCoO2 + xe- + xLi+LiCoO2 Cathode (right side=red) Lio embedded in `intercalation’ compounds on both sides

  14. Our Chemistry Road trip so far … Moles, molecules and reactions Molecules and Moles acting alone

  15. Next up: the Chemistry of the Crowd Chapter 5:Gases (pp. 189-230) an exploration of `aggregate’ behavior

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