Monday, November 8, 2010

Essay On Osmosis/Diff....

EQ: A laboratory assistant prepared solution of 0.8 M, 0.6 M, 0.4 M, and 0.2 M sucrose, but forgot to label them. After realizing the error, the assistant randomly labeled the flasks containing these four unknown solutions as flask A, flask B, flask C, and flask D.
Design an experiment, based on the principles of diffusion and osmosis, that the assistant could use to determine which of the flasks contains each of the four unknown solutions. Include in your answer (a) a description of how you would set up and perform the experiment: (b) the results you would expect from your experiments: and (c) an explanation of those results based on the principles involved. (Be sure to clearly state the principles addressed in your discussion.)
A)     My way of arranging this lab, first I would collect the needed materials. Second, create a question to go along with the experiment. Then I put each flask in a tube and tie it. Afterwards, I would place the flasks in separate cups. In that case, make a hypothesis/prediction (flask A is 0.2, flask B is 0.6, flask C is O.8 and flask 0.4). After that, add potassium iodide and wait 30 minutes.  Make observations. List errors in the experiment, state if your hypothesis is correct or incorrect.  
B)  0.2, 0.4 are weak solutions; therefore they would go through osmosis, going from low to high concentration. 0.6, 0.8 are strong solutions would undergo diffusion, going from high to low concentration.
           C)             

Sunday, November 7, 2010

Osmosis/Diffusion

 In AP biology we talked about Osmosis and Diffusion. Osmosis and diffusion are the very simular. Osmosis is diffusion that happens in water. We tested  two themes using bags and different solutions . We joted down the changes after each solution went through diffusion or osmosis. The lab we completed was dealing with a few different molars. Students used  tubing to hold the Glucose/Starch solution. Then tubing was placed with the solutions. Over time the water changed color. This responce clearly showed that though the process of osmosis, the glucose/starch solution transported itself to the water solution that surrounded it.

Reflection for Cellular Respiration

 This week's lab we learned more about cellular respiration. We answered questions that went along with the lab. I know a lot about this process but I gained more insight. From this experiment, I learned that Cellular Respiration undergoes 3 important steps; glycolysis, oxidative phosporalation and kreb's cycle. I recalled that respiration is the creation of energy due to the forming of ATP from molecules.