"Autumn Leaves of Wisconsin"

"Water Fall in Veteran's Park, Marinette County near Crivitz, Wisconsin"

I had an opportunity to travel in Wisconsin and along the way I took the picture above. As I reflected on our current class discussions of dual properties of light as a wave and light as a particle, considering the visible spectrum, what would be the wavelength of lights that you see as green and orange? How would you measure their frequencies? Why do we see green color like a green grass, green folder, and white colors? Was the color being absorbed or reflected? Why leaves change colors in fall? What do you think?

Problem Solved? Check This Out!

To my students,

Problems' Solution 10/30/08

1)
Given: 2.50 mol Ca
Find: ? g Ca
Solution: 2.50mol Ca x 40.08 g Ca/ 1mol = 100.2 g Ca ~ 100. g Ca Answer

2)
Given: t= 1week
Find: t+? minutes
Solution: 1week x 7days/week x 24hr/day x6o min/hr
1(7)(24)(60)= 10080 min Answer
3)
Given: d= 1.59 g/cm^3
m= 4.0g
Solution: d =m/v v=m/d = 4.0g/ 1.59 g/cm^3 = 2.53 cm^3 ~ 2.5 cm^3 Answer

4)
Given: m=6.005 g C
molar mass= 12.010 g/mol
Find: ? mol C
Solution: 6.005gCx 1molC/12.010g V = 0.5000 mol C Answer

5)
Given: diamond d= 3.5g/cm^3
v= 0.071 cm^3
Find: m=? g
Solution: d=m/v m=dv
= (3.5g/cm^3)(0.071cm^3)
= 0.25 g of diamond

Science Fair Proposal and Abstract

Just a reminder, the Abstract of your Science Fair Proposal will be extended until Monday, the 27th of October. I will not meet you on Friday, October 24th due to Professional Development Day.
The abstract form is available at Brooks Website, click our class chemistry website and see the Science Fair at
http://cuip.uchicago.edu/~aetyagi/0809/chemcurrent.htm or
http://www.cmsi.cps.k12.il.us/ViewProgramDetails.aspx?pid=204

I am inviting everyone to join Brook Science Club (Focus on Science Fair Research Project)

Aspartame ...How Sweet Is It?

Hi Everyone,

Aspartame is a compound in an artificial sweetener with a chemical formula of C14H18N2O5. Do you still remember how to find the molar mass of Aspartame from our discussion today? Remember you need "PT". As extension of our lesson, find out how many grams of Carbon, Hydrogen, Nitrogen, and Oxygen are there in 250 grams of Aspartame. Show or describe how you get your answer.
If you come across with Aspartame, feel free to post your reading and please include your source or URL or links.

Sizing a Mole!

In describing how many particles are there in 1 mole, please include or cite the URL where you get your information. I hope majority of you (my students) will be able to use the conversion factors.
Why 4 Million years to count 6.022 x10^23 particles if 5 Billion people are counting it, at the rate of 1 particle/sec for each person. How do you know? Show your conversion and how do you cancel out the units.
You can be creative and original as long as you show the evidence using "calculation." Have fun!

Mole Problems!

As an extension of our class discussion about "The Mole" as a counting unit. In chemistry, a mole is the amount of a substance that contains as many particle as there are atoms in exactly 12 g of carbon-12. A mole contains 6.0221367 x10^23 particles. In our class we will use 6.022x10^23 particles in one mole. The particles can be atoms, ions, molecules, electrons and more. Another name for 6.022x10^23 is Avogadro's Number, from an Italian scientist, Amedeo Avogadro (1811). He stated that equal volume of different gases contain equal numbers of molecules at the same pressure and temperature.
Got any idea how large is 6.022x10^23 particles? You are all welcome to post your idea. While our textbook, "Modern Chemistry by Holt, Rinehart, & Winston described, "If every person living on Earth ( 5 Billion people) worked to count the atoms in one mole of an element, and if each person counted continuously at a rate of one atom per second, it would take about 4 million years for all the atoms to be counted.
Just for fun! Can anyone post the conversion or just describe how large is the Avogadro's number. Feel free to search Online or make your own.

Brooks' Science Fair

I am inviting all the Brooks Science students to join our Brooks Science Club.The science club members will be provided with informational assistance in completing their science fair projects. The science club will use the available resources from Chicago Math and Science Initiative Program.
Brooks Science Fair will be held at Brooks 3rd Floor Rotunda on December 5, 2008. Each science class will have an in class science fair presentations a week before Thanksgiving.

Science Chicago's program guide listed the following:"Science Fair Central-South will provide a mini-workshop designed to help students of all ages to create outstanding science fair projects" on October 18, 2008 from 9:00am to 12:00 pm at Chicago State University.
The Chicago Public Library Family Science Fair Workshop will be held on October 28, 2008 at 6:30 pm at Chicago Public Library, at Harold Washington Center, 400 South State Street, Chicago.

Join our Brooks Science Club is where respect and good science thrives!