Announcements
Tuesday, May 3
FINAL
When: Tuesday, May 10, 7:30 – 9:30
Where: in our usual room.
BRING YOUR 5” x 7” card with notes.
BRING “problem” exams (misgraded, etc.)
HELP SESSIONS:
JUST DROP IN FOR HELP!!!!
Wednesday at 5 pm, here
Next Monday at 7 pm, TBA
EXTRA CREDIT (10 PTS)
Find the error in the hydrogen car article.
Today’s Factoids
Population of China: 1,300,000,000 (20%
of global population)
Population of USA: 300,000,000
Log10(China) = 9.1
Log10(USA) = 8.5
U.S. –awarded Ph.D.’s in science &
engineering: ~25,000/year
RedOx
Reduction
Oxidation
Lose oxygen
Gain oxygen
Gain hydrogen
Lose hydrogen
Gain electrons
Lose electrons
A sample case
2Na + 2H2O  2Na+ + H2 + 2OH+ e (electron lost)
Na was oxidized: Na 
H was reduced: lost oxygen
O no change: lost H but gained eNa+
Remember…we actually ran this reaction by dumping
some sodium into water.
Another one
2 CH3OH  2 CH2O + H2
C:
H:
H:
O:
???
???
???
???
Still another one (related to
“butter vs. margarine”)
CH3CH2CH2CH=CHCH2CH3 + H2 
CH3CH2CH2CH-CHCH2CH3
H
C ?????
H ?????
H
Secret Agents: all part of the
semantics nightmare that is RedOx
Something that promotes reduction: reducing agent
Example: K, Na, H, LiAlH4
Something that promotes oxidation: oxidizing agent
Example, O, F, Br, K2Cr2O7
Main Applications of RedOx
Recovery of metals from ores
Corrosion
Prevention of corrosion
Batteries
Steel!
And the sons of
Pullman porters & the
sons of engineers
Ride their fathers'
magic carpet made of
steel
Mothers with their
babes asleep, rockin' to
the gentle beat
And the rhythm of the
rails is all they feel
City of New Orleans—
Steve Goodman
Images of steel production
Reducing Iron Ore to Make
Steel:
from rust to riches
2 Fe2O3 + 3C  4 Fe + 3CO2
Rust
i.e., ore
From
Coal
How steel is really made: http://www.sidmar.be/CONTENT/2c.htm
RedOx & Geography
IRON ORE
CARS COAL
Electro-reduction for Aluminum
2Al2O3  4Al + 3O2
Electrons out
Power Plant
Electrons in
Hydroelectric
Power
Aircraft Industry
Hydroelectric
Power
Why do we recycle aluminum?
Corrosion
2 Fe  2 Fe+2 + 4 eElectrons travel down nail
4e
+ 2H2O + O2  4OH
Batteries! What if we could trap
those electrons, make ‘em do some
work before the reduction step?
ENR vs XOM
Fuel Cells—Quick Intro
We are reliant on foreign oil.
http://www.worldfuturefund.org/wffmaster/Charts-HTML/Energy/us-oil.htm
U.S. oil
imports
as a percentage
of consumption
http://www.saudi-usrelations.org/newsletter/saudirelations-12.html
Los Angeles Solar Parking Slots
At the other end of I-10
Hybrid Vehicles
RedOx Chemistry Galore
“The car Detroit wants you to believe cannot be built.”
But is that fair???
Hybrid Locomotive
Cool Fuel Cell Links
How Stuff Works Link:
http://science.howstuffworks.com/fuelcell1.htm
http://science.howstuffworks.com/framed.ht
m?parent=fuelcell.htm&url=http://education.lanl.gov/reso
urces/h2/gottesfeld/education.html
“Maybe I should invest in fuel cells.”
P. Russo, 1999
More Announcements
Pick up your HW4 papers!!
HW5 due 5 pm—no exceptions.
HW5 answers by e-mail
Monday evening help session, 5 pm
Tuesday 7:30 am Final Exam (300 pts)
Remember, only 5” x 7” cheat sheet
No-calculator bribe raised
to 17% for final.