Bio: Lab 6 - Diffusion & Osmosis

Bio: Lab 6 - Diffusion & Osmosis Differences Between
  
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Diffusion
 
Molecules (solutes) move through solutions from areas of high concentration to areas of low concentration. Heat and pressure also affect diffusion (but usually are the same)
Density's effect on Diffusion?
 
Dense slows diffusion (agar vs. water)
More molecules to get through
Pheynolphthalein
 
Reacts with Base PH turning PINK
Cannot pass through membrane because it is POLAR
Iodine
 
Reacts with Starch
Passes through membrane because it is Non-Polar
NaOH
 
Turns Phenyolphthalein pink
Passes through membrane because it is Non-Polar
Starch
 
Reacts with Iodine
Doesn't pass through membrane because it is Polar
Water Potential
 
Combined effects of concentration and pressure that affect the flow of water. Water will flow from high water potential to low water potential. Both high water concentration and high pressure increase water potential.
Hypertonic Solution
 
High molecule concentration of solutes. Water flows TO this.
Hypotonic Solution
 
Low molecular concentration of solutes. Water flows AWAY from this.
Plasmolysis
 
Shrinking cytoplasm of a plant cell due to diffusion of water out of a cell and into a hypertonic solution.
Isotonic Solution
 
Evenly distributed molecule concentration of solutes. Water has even flow in/out.

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