1. 7th Grade PPP#3 Dialysis Tubing Exploration Osmosis and Diffusion
NGSS–MS-LS1-2 Develop and use a model to describe the function of a cell was a whole and ways parts of the cells contribute to the function

2. Diffusion Exploration - Day 1
OBJECTIVE: (NGSS MS-LS1-2): Develop and use a model to describe the function of a cell was a whole and ways parts of the cells contribute to the function
Do Now:
Pick up Journal from front table
Sit with Buddy #1…have a new DO NOW page ready.
Today:
Dialysis Tube Investigation
Journal Prediction(s) and Observations
Plan YOUR investigation with your Buddy
Do Later:
Anything unfinished in your notebook!

3. Diffusion Exploration - Day 2
OBJECTIVE: (NGSS MS-LS1-2): Develop and use a model to describe the function of a cell was a whole and ways parts of the cells contribute to the function
Do Now:
Same Buddy…have DO NOW page ready.
Today:
Lab Safety Rules Review
YOUR investigation
Class notes/OBSERVATIONS
Do Later:
Anything unfinished in your notebook!

4. Diffusion Exploration - Day 3
OBJECTIVE: (NGSS MS-LS1-2): Develop and use a model to describe the function of a cell was a whole and ways parts of the cells contribute to the function
Do Now:
Same Buddy…have DO NOW page ready.
Today:
Vocabulary and Concepts
Proof = Analysis of Evidence
Analogy to Cell parts
Do Later:
Anything unfinished in your notebook!

5. Diffusion Exploration - Day 4
OBJECTIVE: (NGSS MS-LS1-2): Develop and use a model to describe the function of a cell was a whole and ways parts of the cells contribute to the function
Do Now:
Same Buddy…have DO NOW page ready.
Today:
Online Simulation
C.E.R. Lab Reports
Journal – “Rough” C.E.R. for Diffusion Explorations
Do Later:
Anything unfinished in your notebook!

6. Diffusion Exploration - Day 5
OBJECTIVE: (NGSS MS-LS1-2): Develop and use a model to describe the function of a cell was a whole and ways parts of the cells contribute to the function
Do Now:
Same Buddy…have DO NOW page ready.
Friday Funnies
Today:
FINAL DRAFT C.E.R
TBD: Reading Assignment // TBD: Video
Do Later:
Anything unfinished in your notebook!

7. Give 2 examples of a phenomenon (one ex is thunder & lightning)
Please grab your journal from the FRONT Sit with your Number 1 Science Buddy
Do Now:
What is a phenomenon?
Give 2 examples of a phenomenon
(one ex is thunder & lightning)

8. Dialysis Tube Investigation

9. Prediction
Observe the demonstration
Make a prediction in your journal about what you think may happen. You can make more than one prediction.
Wait for 15 minutes

10. Model of the system
BEFORE
AFTER

11. Our predictions

12. Observations
What did you notice? What happened to the substances in the cup? In the tube?
Keep discussing until someone says something like, “there must be little holes in the tube that stuff goes through” and introduce the words “diffusion” and “semi-permeable membrane”

13. Potential Question to investigate:
Have them brain storm “testable questions” until you get someone to say, “What stuff can pass through the tube?” and “what causes the blue color change?”

14. Planning Investigation:
Choose one of the two questions to attempt to answer in your own investigation (as a pair)
Plan your investigation (state the steps including amounts of materials)
Develop a way to collect data
Tomorrow you will:
Run your investigation
Gather your data
Come to a conclusion/claim
Materials
Dialysis Tubing
Glucose/Starch Solution
Iodine Solution
Pipet
Water
Cups
Glucose Test Strips
Well plate

15. Tuesday DO NOW: Name 3 safety rules that will be needed for today’s investigation.
Now its time to run your investigations!

16. Our Observations/Data (i = iodine, gs = glucose/starch, w = water)
Your names
In tube
In cup
What happened?
Grayson/Lippincott Gs
I & w
Cup clear, tube blue
Collect the entrie classes data as they finish have them come up

17. Wednesday Do NOW:

18. Class conclusions from our observations
This will be Wednesday, you will have to display the data table 2 slides back

19. Phenomenon:
When a dialysis tubing bag filled with glucose/starch solution is placed in an Iodine solution, certain substances will pass through the tubing while others will not.
Copy down

20. Important terms/notes
Diffusion: movement of molecules (through a cell membrane) from a higher concentrated area to a lower concentrated area
Osmosis: water moving into and out of a cell (from an area of higher concentration to an area of lower concentration)
Equilibrium/Homeostasis- both areas, inside and out of the cell, have an equal concentration of molecules
Semi-permeable membrane: a membrane that allows certain substances through while blocking other substances
Iodine + starch = a blue color (bc Iodine is an indicator of starch)
Copy into journal

21. Did it diffuse? Proof (how do you know) Iodine Glucose Starch Water
Answers on next slide

22. The iodine solution went from a darker color yellow to a clear color.
Did it diffuse?
Proof (how do you know)
Iodine
Yes
The iodine solution went from a darker color yellow to a clear color.
When iodine passed into the bag, it met with the starch and turned blue
Glucose No
The glucose stayed in the bag. I know this because we tested the cup’s solution with a glucose test strip and it came out negative for glucose.
Starch
If the starch did diffuse, then the solution in the cup would have turned blue.
Water
They initially put 300 mL of water into the cylinder, but now there’s only 220 mL left
Initially, 60 mL of glucose starch solution into tube. After, there was about 65 mL of solution in the tube.

23. Analogy Map IN REAL LIFE IN THE CELL Dialysis Tubing
Glucose/Starch Solution
Cup (Iodine/Water)

24. Thursdays DO NOW

25. Online simulation to understand diffusion:
What to answer in journal:
After: Collect Data 1, answer the multiple choice
After: Collect Data 2, answer: “How did the rate of diffusion change with a higher temp”
After: Collect Data 3, answer: “How did diffusion of the perfume change with an increase of concentration?”
Analysis: Answer #1&2
DO this Thursday before Rough CER

26. Our question is…. Which substances passed through the membrane?
Which substance did not?
Use data to support your claim.

27. Rough CER
CER Rough Draft
Claim: Which substances were able to diffuse through the dialysis tube and which were not?
Evidence: What data did you or the class collect that led you to this claim?
Reasoning: What is the science behind this phenomenon? Include all relevant key terms.
Friday will be final CER