AnnouncementsTuesday, May 3

FINALWhen: 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 FactoidsPopulation of China: 1,300,000,000

(20% of global population)Population of USA: 300,000,000 Log10(China) = 9.1Log10(USA) = 8.5

U.S. –awarded Ph.D.’s in science & engineering: ~25,000/year

RedOx

Reduction OxidationLose oxygen Gain oxygen

Gain hydrogen Lose hydrogen

Gain electrons Lose electrons

A sample case2Na + 2H2O 2Na+ + H2 +

2OH-

Na was oxidized: Na Na+ + e- (electron lost)H was reduced: lost oxygenO no change: lost H but gained e-

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 H

C ?????H ?????

Secret Agents: all part of the semantics nightmare that is

RedOxSomething 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

                                                                                            

And the sons of Pullman porters & the sons of engineersRide their fathers' magic carpet made of steel

Mothers with their babes asleep, rockin' to the gentle beatAnd the rhythm of the rails is all they feel

City of New Orleans—Steve Goodman

Steel!

Images of steel production

Reducing Iron Ore to Make Steel:

from rust to riches

2 Fe2O3 + 3C 4 Fe + 3CO2

Rusti.e., ore

FromCoal

How steel is really made: http://www.sidmar.be/CONTENT/2c.htm

RedOx & Geography

COAL

IRON ORE

CARS

Electro-reduction for Aluminum

2Al2O3 4Al + 3O2

Electrons out

Electrons inPower Plant

Hydroelectric Power

Hydroelectric Power

Aircraft Industry

Why do we recycle aluminum?

Corrosion

2 Fe 2 Fe+2 + 4 e-

4e- + 2H2O + O2 4OH-

Electrons travel down nail

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/u

s-oil.htm

U.S. oilimports as a percentageof consumption

http://www.saudi-us-relations.org/newsletter/saudi-relations-12.html

Los Angeles Solar Parking Slots

At the other end of I-10

Hybrid VehiclesRedOx 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/fuel-cell1.htm

http://science.howstuffworks.com/framed.htm?parent=fuel-cell.htm&url=http://education.lanl.gov/resources/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 pmTuesday 7:30 am Final Exam (300 pts)Remember, only 5” x 7” cheat sheetNo-calculator bribe raised to 17% for final.