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Grade 9College. The 2 exercises in this kit allow students to investigate fundamental principles of digestion, osmosis, and diffusion. Kit materials are sufficient for a class of up to 32 students working in pairs.
Grade 9College. The 2 exercises in this kit allow students to investigate fundamental principles of digestion, osmosis, and diffusion. In the 1st exercise, students test the osmotic rates of urea, sucrose, and glucose solutions in the presence or absence of urease and invertase. This determines how the presence of the enzymes affects the osmotic rates of the solutions. In the 2nd exercise, students use m-cresol purple pH indicator to test for the presence of ammonia, an indication of hydrolysis of urea by urease. Different groups will test different solutions and then pool their data. For a class of up to 32 students working in pairs.
|m-Cresol Purple pH Indicator||1||Included|
|Dropper Bottles (for urea and urease solutions)||2||Included|
|1.0 M Sucrose Solution||1||Included|
|0.5 M Sucrose Solution||1||Included|
|1.0 M Glucose Solution||1||Included|
|1.0 M Urea Solution||1||Included|
|Urease Solution with Buffer, 0.4%||1||Included|
|Enzymatic Urease Powder||3||Included|
|Enzymatic Invertase Powder||3||Included|
|Teacher's Manual and Reproducible Student Guide||1||Included|
|Beakers (150 mL or larger)||25||Needed, Not included|
|Distilled or Deionized Water, 8 L||1||Needed, Not included|
|Test Tube Racks or Beakers (to hold tubes)||Needed, Not included|
|Markers||Needed, Not included|
|Paper Towels||Needed, Not included|
|Wash Bottles (optional)||Needed, Not included|
|Adhesive Tape (optional)||Needed, Not included|
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