1. Diffusion Lab
Diffusion in a baggie

2. Prelab Demonstrations
what happens when idodine comes into contact with starch?

3. Procedure
1.Fill a plastic baggie with a teaspoon of corn starch and half a cup of water..then tie the bag
2. Fill a beaker halfway with water and add ten drops of iodine
3. Place the baggie in the cup so that the cornstarch mixture is submerged in the iodine water mixture
4. Wait fifteen minutes and record your observations

4. Difussion
the movement of molecules from an area of high concentration to an area of low concentration

5. osmosis
the diffusion of water

6. What’s the difference?? Diffusion- can be in the air
Osmosis – Is ONLY water

7. Indicators they “indicate” a change has happened.
Like iodine can indicate starch is present if it turns purple

8. Molecules
Always move from HIGH concentrations to LOW concentrations

9. Concentrated
Lots of substance present

10. Hypo- Means less
Hyper- means more

11. Permeable allows things to pass through
Like the window screen we talked about

12. wait for instructions The cornstarch resembles the cytoplasm of a cell
the plastic bag resemble the cell membrane
Solid objects are not really solid at a molecular level
The bag should act like a tiny screen door
If molecules are small enough- they should be able to pass right through the bag
wait for instructions

13. The orange iodine turns purple when it touches the white starch