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Flinn Lab Activities and Demonstrations
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Solutions and Solubility—Demonstration Kits,
continued
Growing Crystals in Gels—
Chemical Demonstration Kit
By: The Flinn Staff
Grow your own spectacular display of long-lasting crystals in gels— using large sized demonstration bottles! Mix two solutions together to form a gel overnight. Add another solution to the hardened gel and watch amazing crystals begin to form before your eyes! Crystals become more and more beautiful over the next two or three weeks! Introduce your students to the phenomenon of crystal growing with this easy-to- prepare demonstration. Highly visible potassium hydrogen tartrate and lead iodide crystals are grown—making a perfect display. Kit includes a detailed handout with easy-to-follow instructions.
Concepts: Crystal formation, solutions/solubility, ions.
Setup Time Required: 30 minutes total over two class periods Materials Provided: Acetic acid solution, lead nitrate solution, potassium chloride solution, sodium silicate solution, tartaric acid solution, potassium iodide, and two crystal-growing bottles with caps.
Supersaturation Flask—
Chemical Demonstration Kit
By: The Flinn Staff
Inspire your students’ curiosity about supersaturation, solutions, and crystals with this easy and engaging demonstration! Drop a seed crystal into a flask and watch the chain reaction as the supersaturated sodium acetate solution crystallizes and releases heat. This demonstration is great for teaching solutions, solubility, and exothermic processes. After watching the demonstration, your students’ understanding of supersatu- ration will be “crystal clear!”
Concepts: Supersaturation, exothermic, crystallization.
Time Required: 10 minutes
Materials Provided: Sodium acetate, 250-mL Florence flask, and a rubber stopper.
Keep Your Eye on the Ions— Double Replacement Model Demonstration Kit
By: Patti Duncan
High Point Regional High, Sussex, NJ
Do it again! This is what your students will say once they have seen the key concepts of a double replacement reaction. Water soluble paper “bonds” hold the starting molecules together. When the molecules are placed in water, the bonds break and “ionization” occurs. Some of the ions bond (magnetic attractions) and form insoluble molecules that precipitate (sink) to the bottom of the beaker. Other “soluble” ions (non- magnetic) continue to float around in solution. A very powerful visual analogy for a common chemical reaction that you will want to include in your arsenal of demonstrations.
Concepts: Double replacement reaction, solubility.
Time Required: 15 minutes
Materials Provided: Marbles, magnetic marbles, and cellulose paper.
Growing Crystals in Gels—Chemical Demonstration Kit AP6157
Catalog No.
Description
Price/Each
AP6157
Growing Crystals in Gels— Chemical Demonstration Kit
$52.55
Supersaturation—Demonstration Kit AP8087
Catalog No.
Description
Price/Each
AP8087
Supersaturation—Chemical Demonstration Kit
$44.35
Catalog No.
Description
Price/Each
AP6377
Keep Your Eye on the Ions—
Double Replacement Model Demonstration Kit
$17.95
SOLUTIONS AND SOLUBILITY—DEMONSTRATION KITS continued on next page.
Keep Your Eye on the Ions—
Double Replacement Model Demonstration Kit AP6377