1. How do Temperature, Pressure and Concentration affect the rate of Diffusion?

2. Your completed partner lab report will include:
Purpose
Background
Hypothesis
Materials
Procedure
Data & Observations
Conclusions
Works Cited

3. Review What is diffusion?
Where does diffusion happen?/Can you give examples of diffusion?
What is rate? How can you measure it?
What factors effect the rate of diffusion?
How many variables can you test at one time?

4. Question/Purpose
What lab can you develop that will test a factor that may affect the rate of diffusion across a cell membrane?
How can we change temperature?
How can we change pressure?
How can we change concentration?

5. Test Materials?
What types of cells can we use to actually see change due to diffusion?
What are some solutes that we have worked with this year?
How can you change
Temperature
Pressure
concentration
Elodea Leaf cells
Simulated Cells
Potato or Apple Cores
Eggs
Onion Cells
Celery
Raisins

6. Developing the Lab and Presenting Data
Day 1 and 2 (Group pre- work)
Brainstorm on what you and your group might like to do
Form Hypothesis
Add to list of materials
Create Procedure
Make sure that you are creating a procedure that will actually let you measure the rate!!!!!
Get Teacher Approval
Day 3 (Work Day)
Gather Data
Quantitative
Qualitative
Graphs/Charts/Pictures
Form Conclusion

7. Presenting your data
A formal lab report will be created in class on ______________and on your own as homework.
This will be an individually written lab report.
Formal lab reports will be due DEC 18, 2012 (the day after the Chapter 5 test).
Lab reports must be edited by a peer or teacher prior to handing in!
You will be responsible for this material on the test, you will need to pay attention and participate in the lab, don’t sit back and let your lab partners do the work!

8. Materials Cart at front of room: Sugar/Starch/Salt
Indicators (Iodine, Benedicts)
Extra Timers
Extra Beakers
Rulers
Extra Thermometers
Plastic Spoons
Oven Mits
Tweezers/Tongs
Test Tubes
Weigh Boats
Floss
Scissors
At lab Tables:
Timers (2)
Graduated Cylinders (2)
Medium Beakers (2)
Large Beaker and Hot Plate
Scale
Thermometers (2)
Middle Lab Table:
Cells (elodea, potato, onion, celery, simulated cells)
Pipettes
Slides and Coverslips
Distilled Water
Ice
2011:
6 extra timers
8 extra small beakers
6 extra thermometers
2 onions
2 potatoes
2 bunches of elodea
Two small packages of simulated cells
1 gatorade container of ice (tom brought from pe)
You must tell your teacher on Day 1 or 2 if you need anything in addition to these items.

9. How do you graph and interpret rate?
Line graph or bar graph?
Equations/analysis in the conclusion of your paper?