1. Diffusion Lab Notes Reviewing the State Lab

2. What can we conclude from this lab exercise? The cell membrane regulates what goes in and out of the cell Small or simple molecules pass easily through the cell membrane The diffusion of water into and out of the cell is called osmosis If too much water leaves the cell, it shrinks

3. How do we know this? Created cell to model osmosis and cell turned blue black because iodine went into the cell Cell watery environment had glucose in it- turned milky orange in presence of Benedicts Onion cell shrunk in salt water and went back to original size after rinsed

4. Other Facts Indicator- a chemical that reacts with another chemical and makes the color change indicating its presence Lugol’s-indicates the presence of starch, turns blue black Benedict’s Solution- indicates the presence of glucose-turns milky orange when heated

5. What kind of molecules can pass through membrane easily? Simple ones-ex: glucose Water Large complex molecules do not- ex: Starch

6. What determines whether salt solution or water enters the cell? The concentration of water must be greater either inside or outside for water to leave or enter Water will move from high to low

7. Osmosis Concentration inside Concentration outside Water willCell will HighLowLeaveShrink-Hypertonic LowHighEnterGrow and may explode-hypotonic Equal to outsideEqual to insideStay sameMaintain balance or Equilibrium-isotonic