Download osmosis

DIFFUSION/DIALYSIS/OSMOSIS LAB
Click on the link below to see information on diffusion:
http://www.wisc-online.com/objects/index_tj.asp?objID=AP1903
1. What is diffusion? Does it only occur in laboratories?
Explain.
(This is a hint)
2. In the very beginning, how does the concentration of the blue particles on side A
compare to that of side B?
3. What 3 things can molecules moving with kinetic
energy do?
a.
b.
c.
4. Net diffusion moves down the concentration gradient from areas of
_________concentration to areas of __________concentration.
5. Eventually the two sides will come to equilibrium. What is equilibrium?
6. What happens to the movement of molecules when their
temperature is r a i s e d ?
7. What happens to the movement of molecules when their
temperature is d e c r e a s e d ?
Watch the video: http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html
OSMOSIS
Click on the link below to see information on osmosis: http://www.wisconline.com/objects/index_tj.asp?objID=AP11003
8. What is osmosis?
9. What does the dashed line in the beaker separating
the two sides represent?
10. Why are they assuming the large molecules will stay on their own side of the membrane?
11. Because molecules will move from one side to another to come to an equilibrium, or balance of
concentration, the
level on side A goes
moves from side B to side A, so the water
.
12. In living things, cells must be in a
enters the cell at
solution where water leaves and
.
13. What happens to a cell in a concentrated, hypertonic environment? Click on the “View Movie”
icon to find out.
14. What happens to a cell in a concentrated, hypotonic environment? Click on the “View Movie”
icon to find out.
Watch the video:
http://highered.mcgraw
hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html
After the video take the quiz that follows-
The next link that was normally associated with this lab is no longer available, so instead, go to
this video and watch it (7 minutes long). Answer the questions that follow.
http://www.youtube.com/watch?feature=player_embedded&v=hxZFU2LBfgA
What is the formula for glucose?
What is the difference between a monosaccharide and a polysaccharide?
IKI (Lugol’s solution) is an “indicator” for starch. What happens when IKI and starch come
together?
In the experiment, what is being used to test for the presence of glucose?
What is dialysis tubing normally used for?
At the start of the experiment, what is in the beaker?
What is in the dialysis bag?
Describe the appearance of the dialysis
bag at the beginning of the experiment.
Describe the appearance of the dialysis
bag after 10 minutes.
Rank these molecules by size from smallest to largest, then
explain your logic based on the experiment.
Glucose- Water- IKI- Starch