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In the Concentrating on Equilibrium Laboratory Kit for biology and life science, discover that diffusion is due to molecules moving randomly around and that the "final" state of equilibrium is really a dynamic condition.

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No more confusion about diffusion and equilibrium! In this interactive class demonstration, students discover that diffusion is due to molecules moving randomly about and that the “final” state of equilibrium is really a dynamic condition. Transferring “molecules” across a simulated cell membrane provides a model for diffusion down a concentration gradient. The random motion of molecules, however, means that some molecules are transferred back. As students move the molecules back and forth at a prescribed rate, they see the motion never stops! Kit includes complete instructions with reproducible student handouts, data table transparency sheet, valuable Teacher NotesSuper Value Kit is complete for 30 students working in pairs, and all materials are reusable!

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Developing and using models
Analyzing and interpreting data
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-LS1.A: Structure and Function
HS-LS1.A: Structure and Function

Crosscutting Concepts

Patterns
Cause and effect
Systems and system models
Energy and matter
Structure and function
Stability and change

Performance Expectations

MS-LS1-2. Develop and use a model to describe the function of a cell as a whole and ways parts of cells contribute to the function.
HS-LS1-3. Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.