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HOW DO TEMPERATURE, PRESSURE AND CONCENTRATION AFFECT THE
RATE
OF DIFFUSION?
Your completed partner lab report will include:
Purpose Background Hypothesis Materials Procedure Data & Observations Conclusions Works Cited
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?
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?
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
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
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!
Materials
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
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
You must tell your teacher on Day 1 or 2 if you need anything in addition
to these items.
How do you graph and interpret rate?
Line graph or bar graph? Equations/analysis in the conclusion of
your paper?