Homework 10 posted and due Friday 13 April

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Homework 10 posted and due Friday 13 April Monday…Ick

Homework 10 posted and due Friday 13 April Monday…Ick

SPECTACULAR REDOX REACTION BEHAVIOR 1) Thermite reaction 1)assign oxidation # 0 +3 -2 2

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

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 # :

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

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

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

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

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

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+

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

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

Ford Focus all electric car High surface area lithium ion batteries

Power cycle – what happens as you drive Key Chemistry trick: LOAD +1 0

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

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

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