Oxygen and carbon dioxide freely cross cell membranes. The simulation demonstrates the diffusion of these across a permeable membrane. To create a great visual for users, it graphs the balance of molecules as it changes throughout the simulation. 

Concepts

membranes, molecular motion, cell membranes

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Additional Tags

science

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Instructional Ideas

• Try various setups: high O2 and high CO2 on one side with none on the other; high O2 on one side and high CO2 on the other, etc.
• Discuss why a membrane is necessary if it is permeable

Classroom Considerations

• Relies on prior knowledge of diffusion, cell membranes, O2, and CO2

Pros

• Translates into four languages for English learners
• Works well in traditional or flipped classrooms

Cons

• None

Common Core

SL.9-10.2 SL.11-12.2 RST.9-10.4 RST.11-12.4