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 Elodea Leaf cells Simulated Cells Potato or Apple Cores Eggs Onion Cells Celery Raisins

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 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.

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