Wednesday, April 16, 2008
Wednes-Day 1
Bio- we began our Evolution Unit by defining evolution- the FACT, and Evolution- the modern theory that explains how and why the diversity of organisms that exist today came about.
Sadly, Evolutionary Theory is not presented accurately in the media and is often horrifyingly misunderstood. Already, we have cleared up some misconceptions about the fact of evolution and the Theory of Evolution.
We looked at the various general fields of science that provide evidence that SUPPORTS the Modern Synthetic Theory of Evolution: Geology, Cytology (the study of cells of various organisms), Anatomy, Embryology, and MOST importantly, Biochemistry (comparing DNA, RNA, proteins, sugars, and fats).
Starting with Geology, we saw how consecutive layers of sedimentary rock give you a relative time scale of when the fossils were created. Older fossils/older species are found in the older rock layers (near the bottom of the layers) and newer fossils/species are found in the upper layers. To estimate the absolute age of a fossil (more detailed than the relative age), geologists determine the radioactivity of the rocks in the layers, which reveals the ages of the rocks.
We will discuss the other fields that give supporting evidence to this all-encompassing theory in Biology.
Chem 7- we did several solubility curve problems and also looked at the factors that determine the rate of dissolving: temperature, surface area of SOLID solutes, pressure of GASEOUS solutes, and stirring/agitation/shaking. These factors all DIRECTLY can increase the number of solute to solvent COLLISIONS per second, which CAUSES the rate of dissolving.
Chem 8/9- we did several solubility curve problems and also looked at the factors that determine the rate of dissolving: temperature, surface area of SOLID solutes, pressure of GASEOUS solutes, and stirring/agitation/shaking. These factors all DIRECTLY can increase the number of solute to solvent COLLISIONS per second, which CAUSES the rate of dissolving.
We continued our Precipitate Bingo lab using a variety of aqueous solutions that you mixed together either to form a precipitate or to see no reaction. We will discuss that writeup on Friday.
Sadly, Evolutionary Theory is not presented accurately in the media and is often horrifyingly misunderstood. Already, we have cleared up some misconceptions about the fact of evolution and the Theory of Evolution.
We looked at the various general fields of science that provide evidence that SUPPORTS the Modern Synthetic Theory of Evolution: Geology, Cytology (the study of cells of various organisms), Anatomy, Embryology, and MOST importantly, Biochemistry (comparing DNA, RNA, proteins, sugars, and fats).
Starting with Geology, we saw how consecutive layers of sedimentary rock give you a relative time scale of when the fossils were created. Older fossils/older species are found in the older rock layers (near the bottom of the layers) and newer fossils/species are found in the upper layers. To estimate the absolute age of a fossil (more detailed than the relative age), geologists determine the radioactivity of the rocks in the layers, which reveals the ages of the rocks.
We will discuss the other fields that give supporting evidence to this all-encompassing theory in Biology.
Chem 7- we did several solubility curve problems and also looked at the factors that determine the rate of dissolving: temperature, surface area of SOLID solutes, pressure of GASEOUS solutes, and stirring/agitation/shaking. These factors all DIRECTLY can increase the number of solute to solvent COLLISIONS per second, which CAUSES the rate of dissolving.
Chem 8/9- we did several solubility curve problems and also looked at the factors that determine the rate of dissolving: temperature, surface area of SOLID solutes, pressure of GASEOUS solutes, and stirring/agitation/shaking. These factors all DIRECTLY can increase the number of solute to solvent COLLISIONS per second, which CAUSES the rate of dissolving.
We continued our Precipitate Bingo lab using a variety of aqueous solutions that you mixed together either to form a precipitate or to see no reaction. We will discuss that writeup on Friday.
# posted by C @ 1:00 PM 
