High School Biology-Chemistry SMILE Meeting
10 April 2001
Notes Prepared by Porter Johnson

Therese Donatello (St Edwards School) 
reviewed the discussion of organic chemistry begun last time. 

Karlene Joseph (Lane Tech HS) Propagation of Sound 
when sound travels from one medium to another, the speed and quality of the sound change.  This fact was demonstrated by hitting a metal strip [about 3 cm ´ 30 cm ´ 1 mm] on a string. We first hit the strip with a pen while holding it, and then put the strip itself against our ear. In the latter case the sound is transmitted through the strip, as well as in the air; in the former case we hear it only through the air. The sounds were quite different for the two cases.

Ben Stark (IIT Biology)
showed us a model of glucose, an organic compound at the heart of the process of our metabolism.  In the biological world plants take in light energy, carbon dioxide C02, and water H20; and produce glucose C6H12O6 through photosynthesis.  Oxygen is given off as a byproduct.  The net chemical reaction is something like the following

6 C02+ 6 H20 ® C6H12O6 + 6 02

Oxygen and glucose combine within animals or fungi to produce energy, and carbon dioxide is given off as a byproduct.  This Oxygen - Carbon Dioxide Cycle requires both green plants and animals for its continuous operation.  Energy is stored in glucose in the detailed arrangement of the chemical bonds of the atoms of Carbon, Oxygen, and Hydrogen.

Notes taken by Ben Stark and Karlene Joseph