Announcements tuesday may 3
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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

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Announcements Tuesday, May 3

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AnnouncementsTuesday, 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


A sample case

2Na + 2H2O 2Na+ + H2 + 2OH-

Na was oxidized: Na  Na+ + e- (electron lost)

H was reduced: lost oxygen

O 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: ???


CH3CH2CH2CH=CHCH2CH3 + H2

CH3CH2CH2CH-CHCH2CH3

H

H

Still another one (related to “butter vs. margarine”)

C ?????

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 ofPullman 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


Images of steel production


Reducing Iron Ore to Make Steel:from rust to riches

2 Fe2O3 + 3C 4 Fe + 3CO2

From

Coal

Rust

i.e., ore

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 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/us-oil.htm

U.S. oil

imports

as a percentage

of 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 pm

Tuesday 7:30 am Final Exam (300 pts)

Remember, only 5” x 7” cheat sheet

No-calculator bribe raised

to 17% for final.


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