Homework 10 posted and due Friday 13 April
- Slides: 15
Homework 10 posted and due Friday 13 April Monday…Ick
SPECTACULAR REDOX REACTION BEHAVIOR 1) Thermite reaction 1)assign oxidation # 0 +3 -2 2 Alo(s) + Fe 2 O 3 (s) 2 Fe 0 (liq)+Al 2 O 3(s) 2) Who does what? Which element oxidized ? Which element reduced ? Al Fe https: //www. youtube. com/watch? v=qqv. Qwf. H_w. GQ 3)let’s see the reaction in the `flesh’ (why we don’t do this one in class…)
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 C 6 H 10 O 5+6 O 2 6 CO 2 +5 H 2 O 2) Who does what? Which element oxidized ? Which element reduced ? C O BURN BABY, BURN
SPECTACULAR REDOX REACTION BEHAVIOR (continued) Example 3: Combination redox 1) Assign Oxidation # : 0 0 +1 -1 2 Na + Cl 2 Na. Cl (table salt) 2) Who does what? Which element oxidized ? Which element reduced ? 3) Let’s see it https: //www. youtube. com/watch? v=Ftw 7 a 5 ccubs
SPECTACULAR REDOX REACTION BEHAVIOR (continued) Example 4: Exchange (how chemists tear apart beer cans with their bare if wimpy hands) 0 0 +2 +3 2 Al 0 https: //www. youtube. com/wat + 3 Cu 2+ 2 Al 3+ + 3 Cuo ch? v=Ftw 7 a 5 ccubs 1)Assign oxidation numbers 2) Who does what? Which element oxidized ? Which element reduced ? Al Cu 2+
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 C 12 H 22 O 11 + 8 KCl. O 3 11 H 2 O + 12 CO 2 + 8 KCl Ox Red
Example 6: Some Final, in-class biological examples 0 +1 -2 0 +4 -2 +1 -2 C 6 H 12 O 6 + 6 O 2 6 CO 2 +6 H 2 O Respiration https: //www. youtube. com/watch? v=Jog. VLCz. OW 0 c Volunteer to demo (mole $$ !)
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’
Example: Cu-Mg cell The complete redox reaction Gains 2 e- Cu 2+ + Mgo Cuo +Mg 2+ Loses 2 e. Reduction half reaction: Cu 2+ +2 e- Cuo cathode Oxidation half reaction: Mgo Mg 2+ +2 e- anode Cu 2+ + Mgo Cuo +Mg 2+
The experimental set-up of (Mg|Mg 2+ ||Cu 2+ |Cu) cell Mg 0 Mg 2+ +2 e- LOAD Electron flow out of anode Na. Cl bridge Cl- Na+ anode cathode Oxidation Cu 2+ +2 eo Cu Reduction
e- out Mg|Mg 2+ OX ~1. 5 V e- in Cu+2| Cu RED The Potato clock relies on O 2 to cause Cu to oxidize to Cu. O which dissolves to form Cu+2(aq). Any `juicy’ vegetable or fruit can serve as electrolyte source
Ford Focus all electric car High surface area lithium ion batteries
Power cycle – what happens as you drive Key Chemistry trick: LOAD +1 0 Lix C 6 x. Li+ + 6 C + xe. Anode (left side =ox) +1 0 Li 1 -x. Co. O 2 + xe- + x. Li+ Li. Co. O 2 Cathode (right side=red) Lio embedded in `intercalation’ compounds on both sides
Our Chemistry Road trip so far … Moles, molecules and reactions Molecules and Moles acting alone
Next up: the Chemistry of the Crowd Chapter 5: Gases (pp. 189 -230) an exploration of `aggregate’ behavior
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