Cell Size Experiment

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Register to read the introduction… Which surface area-to-volume ratio gave the fastest diffusion rate?
-The surface area-to-volume ration that gave the fasted diffusion rate was 1.5 : .125 (0.5cm potato cube.) 2. Which surface area-to-volume ratio had the greatest diffusion depth?
-The surface area-to-volume ration that had the greatest diffusion depth was 1.5 : .125 (0.5cm potato cube.)

3. How might a cell’s shape influence the rate of diffusion?
- As a cell gets larger, the ratio of surface area to volume decreases. That means a larger cell has less surface area for the same amount of volume than a smaller cell would have; larger cells move dissolved substances more slowly throughout the entire cell than smaller cells do.

4. What factors affect the rate of diffusion and how can these be
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At room temperature, the average velocity of a molecule is fast. Temperature increases the rate of molecular movement, therefore, increases the rate of diffusion. Pressure increases the speed of molecules, increasing the rate of diffusion.

Lab 2- Modeling Diffusion of Osmosis:
Background Information-
Passive transport is a kind of transport by which ions or molecules move along a concentration gradient, which means movement from an area of higher concentration to an area of lower concentration.
The dialysis tubing is acting as a semipermeable membrane between each solution.

Description of the Experiment-
In this lab, we observed the acts of passive transport: diffusion and osmosis in a model membrane system. The experiment will show how molecules in solution move from areas of higher concentration to areas of lower concentration. The model membrane was dialysis tubing. The different solutions used were 5% ovalbumin and 1M NaCl. Both solutions were injected into two different dialysis tubes and submerged into distilled water.

Expectations/Hypothesis of the Experimental Outcome-
By the end of this experiment, I think that the solution with the most density will have the most change in density.

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What factors determine the rate and direction of osmosis?
- Temperature because a higher temperature means a faster rate of reaction. Also, concentration of molecules is a factor. Concentrations of molecules have to move from an area of high concentration to an area with low concentration. Lastly, the distance the molecules are, is another factor. The more distance between the two sides the slow the rate of osmosis.

2. What would you predict if you used a starch solution instead of the protein?
-If a starch solution would be used, the change in the final mass would be more drastic. More molecules would have been able to enter the solution in the dialysis bag easier, therefore, increasing the final mass of the solution.

3. Can you diagram the flow of water based upon the contents of your model cell and the surrounding solution?
-I can diagram the flow of water based upon the contents of my model cell and the surrounding solutions. I could draw the cup of distilled water with the dialysis tubes filled with the solutions in them. Then, I could draw in arrows to show whether or not water goes into the tubes.

4. When will the net osmosis rate equal zero in your model

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