Page 178 - Demo

Flinn Lab Activities and Demonstrations
Biochemistry—Demonstration Kits, continued
Help from MOM—Biochemistry of
Antacids Demonstration Kit
By: The Flinn Staff
Students know that the stomach contains acid and that too much acid may cause heartburn. Use this fascinating demonstration to show students the biology and chemistry of how an antacid alleviates heart- burn. With a little help from MOM—milk of magnesia—and universal indicator, students will clearly see the neutralizing effect of magnesium hydroxide on stomach acid. Colorful demonstration is sure to provoke interesting discussions about the chemistry of other over-the-counter medications and the biochemistry of the human body. Includes detailed instructions with discussion of the chemical and biological processes, student worksheet, and enough materials to perform the demonstration seven times.
Concepts: Acid–base neutralization, digestion, antacids.
Time Required: 15 minutes
Materials Provided: Milk of magnesia, hydrochloric acid, universal indicator solution, pipets.
Lactose Intolerance—Demonstration Kit
By: The Flinn Staff
Intestinal gas—not a very pleasant thought! Gas can
be a big problem for those who lack the enzymes to digest certain foods. Do products that advertise to eliminate this problem really work? This demonstration kit shows an over-the-counter enzyme LactaidTM (lactase) in action! Flasks containing various sugar combinations with and without LactaidTM are compared for gas production by yeast cells. Balloons inflate very quickly when digestible sugars are available to the lactose intolerant yeast cells. Inflated and non-inflated balloons dramatically illustrate the concept and consequences for students. Enough materials are provided in this kit to perform the demonstration seven times.
Concepts: Enzymes, disaccharides, monosaccharides.
Time Required: One class period
Materials Provided: Baker’s yeast, galactase, glucose, balloons, LactaidTM tablets, lactose.
Alcohol Fermentation—
Demonstration Kit
By: The Flinn Staff
The unique color changes will help your students understand the fermentation process. A glucose solution is inoculated with yeast in an Erlenmeyer flask and then connected with a tube to a gas-collecting chamber. As fermentation occurs, the depletion of the oxygen in the flask causes a dramatic color change in the indicator in the flask. Simultaneously, the carbon dioxide produced from the reaction causes a color change in a different indicator solution in the collecting chamber. Enough indicator solutions, yeast, and sugar are provided to conduct the demonstration seven times. Detailed instructions and background informa- tion are provided.
Concepts: Fermentation, pH indicators.
Time Required: One class period
Materials Provided: Glucose, phenol red solution, resazurin solution, yeast.
Note: A 250-mL flask, one-hole stopper, test tube, glass tube, and plastic tubing are required for completion of the demonstration.
1-800-452-1261
flinnsci.com
Help from MOM— Biochemistry of Antacids Demonstration Kit FB1857
176
Catalog No.
Description
Price/Each
FB1857
Help from MOM—Biochemistry of Antacids Demonstration Kit
$20.75
Lactose Intolerance— Demonstration Kit FB1570
Alcohol Fermentation— Demonstration Kit FB1626
Catalog No.
Description
Price/Each
FB1570
Lactose Intolerance—Demonstration Kit
$67.75
Catalog No.
Description
Price/Each
FB1626
Alcohol Fermentation—Demonstration Kit
$27.00