Page 124 - Demo

Flinn Lab Activities and Demonstrations
Solutions and Solubility—Demonstration Kits,
continued
Solutions, Colloids and Suspensions—
Chemical Demonstration Kit
By: The Flinn Staff
The size of the particles determines whether a mixture is a solution, colloid or a suspension. Through a series of four demonstrations, students will see and learn how to easily identify a mixture as one of these three types. Can the particles be collected in a filter? Will they pass through a semipermeable membrane? Do they scatter light? Students witness these different properties and draw conclusions based on their observations. Demonstration Notes and student worksheets are included.
Concepts: Solution, colloid, semipermeable membrane, Tyndall effect. Time Required: 20 minutes
Materials Provided: Ammonium hydroxide solution, copper(II) sulfate solution, colloidal starch solution, hydrochloric acid solution, iodine– iodide solution, sodium thiosulfate solution, dialysis tubing and clamps. Note: Perform this demonstration in a fume hood or well-ventilated lab.
1-800-452-1261
flinnsci.com
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Catalog No. Description
AP6635 Solutions, Colloids and Suspensions—
Chemical Demonstration Kit
Price/Each $40.75
Solutions, Colloids and Suspensions—Chemical Demonstration Kit AP6635
Sorting Out Solutions— Chemical Demonstration Kit AP8902
Sorting Out Solutions—
Chemical Demonstration Kit
By: The Flinn Staff
Two clear solutions are combined to form a homogeneous mixture. As a solid chemical is added, the two seemingly inseparable solutions begin to “sort” into two layers. As more solid is added, the two layers become more distinct. Demonstration Notes included.
Concepts: Solubility, bonding, polar and nonpolar solvents.
Time Required: 15 minutes
Chemicals Provided: Ethyl alcohol and potassium carbonate.
Catalog No. Description Price/Each AP8902 Sorting Out Solutions—Chemical Demonstration Kit $47.35
The Aloha Chemical Sunset—
Chemical Demonstration Kit
By: David A. Katz, Retired, Wilmington, DE
Do you and your students need a spring break already? If you can’t see a Hawaiian sunset in person, simulate it in the laboratory! This fun demonstration shows how light passing through a colloidal suspension is affected by the size of the colloidal particles—this is known as the Tyndall effect. Two solutions are mixed in a Petri dish on an overhead projector, producing a spectacular multicolored “sunset.”
Concepts: Colloids and precipitates, Tyndall effect/light scattering. Time Required: 10–15 minutes
Materials Provided: Sodium thiosulfate solution, hydrochloric acid solution, Petri dish, and chemical sunset cutouts.
The Aloha Chemical Sunset—Chemical Demonstration Kit AP8988
See free video at flinnsci.com.
Catalog No. Description
AP8988 The Aloha Chemical Sunset—
Chemical Demonstration Kit
The Chemical Kidney—
Chemical Demonstration Kit
By: Jim and Julie Ealy, Retired The Peddie, Hightstown, NJ
Price/Each $25.75
Mix water from a large beaker back and forth into five other beakers. Your students will observe a variety of color changes. Solutions looking like red wine, lemonade, grape juice and others are produced with the final solution being a distinct yellow. Demonstration Notes included. Concepts: Complex ions, formation of precipitates.
Time Required: 20 minutes
Chemicals Provided: Iron(III) chloride solution, ammonium thiocya- nate solution, tannic acid solution, and oxalic acid solution.
The Chemical Kidney— Chemical Demonstration Kit AP8461
Catalog No. Description
AP8461 The Chemical Kidney—Chemical Demonstration Kit
Price/Each $35.25
SOLUTIONS AND SOLUBILITY—DEMONSTRATION KITS continued on next page.