Page 143 - Demo

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Diffusion and Osmosis
141
Cells and Genetics—
Diffusion and Osmosis, continued
Exploring the Rate of Diffusion—
Student Laboratory Kit
By: The Flinn Staff
Deepen your students’ understanding of the factors that affect diffusion with this advanced-level study kit. Students will investigate how three variables influence the rate of diffusion of dye molecules in agar. Explore the quantitative effects of the concentration of the agar gel, the diameter of the test tube, and size of the dye molecule. A new twist on a classic scientific concept! Includes all necessary chemicals and consumable supplies, comprehensive student instructions, and Instructor’s Notes.
Complete for 30 students working in pairs. Super Value Kit is complete for 5 classes of 30 students working in pairs.
Concentrating on Equilibrium— Super Value Kit
By: The Flinn Staff
No more confusion about diffusion and equilibrium! In this interac- tive class demonstration, students discover that diffusion is due to molecules moving randomly about and that the “final” state of equi- librium 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, and valuable Instructor’s Notes.
Super Value Kit is complete for 30 students working in pairs. All materials are reusable.
Dialysis Fundamentals—
Student Laboratory Kit
By: The Flinn Staff
Introduce the basic concepts of osmosis and diffusion with this involv- ing laboratory activity. Using a colloidal solution of starch and sodium chloride students will:
• Clearly observe the process of dialysis
• Observe diffusion through a semipermeable membrane • Separate an inorganic salt from a colloid
• Test for the presence of chloride ions and starch
Includes reproducible student handouts with detialed instructions and valuable Instructor’s Notes with teaching tips and sample data.
Complete for 30 students working in pairs.
Membrane Diffusion—
Student Laboratory Kit
By: The Flinn Staff
A two-part experiment to solidify the concepts of osmosis, diffusion, and semi-permeable membranes. Students will conduct trials first with dialysis tubing (an artificial membrane), and then with plant tissue (a natural membrane). They will compare and contrast the two systems and become familiar with the terms hypotonic, isotonic, and hypertonic. Relate these concepts to water balance in living organisms and evolution.
Complete for 24 students working in pairs.
Exploring the Rate of Diffusion—Student Laboratory Kit AP7273
Catalog No.
Description
Price/Each
AP7273
Exploring the Rate of Diffusion— Student Laboratory Kit
$ 48.85
AP7565
Exploring the Rate of Diffusion— Super Value Laboratory Kit
108.90
Concentrating on Equilibrium—Super Value Kit FB1906
Catalog No.
Description
Price/Each
FB1906
Concentrating on Equilibrium—Super Value Kit
$26.20
Dialysis Fundamentals—Student Laboratory Kit FB0435
Catalog No.
Description
Price/Pkg.
FB0435
Dialysis Fundamentals—Student Laboratory Kit
$50.15
Catalog No.
Description
Price/Each
FB0752
Membrane Diffusion—Student Laboratory Kit
$40.25
CELLS AND GENETICS—DIFFUSION AND OSMOSIS continued on next page.
Membrane Diffusion—Student Laboratory Kit FB0752