Wednesday, May 12, 2010

CA Chem Standard post

ChemStd12l: Analyze situations and solve problems that require combining and applying concepts from more than one area of science.
From elementary school to high school, we have learned many different areas of science. They include biology, chemistry, and physics. There are many more, but I will not name them all. you can go to this website and find out :)
-Biology is the study of living organisms.
-Chemistry is the study of matter and its interactions with energy and itself.
-Physics is the study of the behavior and properties of matter. (forces, attractions, and repulsions)


When we went on the field trip to the Mills Canyon, we have encountered different areas of science. As we walked to Mills Canyon, there was physics involved: static friction. We require friction to move about in safety (remember how difficult it is to walk on very icy pathways). Without the external force of friction, we would be unable to stop. Walking through the streets and the path in Mills Canyon, we noticed a lot of trees and flowers growing. We also saw birds, insects, and spiders. This was biology! These living creatures always had some type of chemical reactions taking place within them. As Mr. Olson says, "Biology is chemistry!"

The chemical reactions that occurred in the plants and trees was photosynthesis:


6CO2 + 6H2O + energy(sunlight) -> C6H12O6 + 6O2 .


Animals, plants, and we were undergoing cellular respiration:
C6H12O6 + 6O2 -> 6CO2 + 6H2O + energy(as ATP) .


In the path we walked through, we also saw evidence of rust forming on a spike:
4Fe +3O2 -> 2Fe2O3 .
From going on this field trip, we have touched upon more than one area of science.

Another situation where we would combine more than one area of science: Thermochemistry is the study of energy evolved or absorbed in chemical reactions and any physical transformations such as melting and boiling. When we boil water, it turns into steam. This is a physical change. The temperature goes up because the kinetic energy, which is the movement of molecules, is increased. Water has the highest specific heat capacity of any substance.

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