Page 121 - Demo

“Your Safer Source for Science”
Solutions and Solubility
119
Solutions and Solubility—Demonstration Kits,
continued
Becker Bottles “One in a Million”
By: Bob Becker
Kirkwood H.S., Kirkwood, MO
How big is a million? What does it mean for a contaminant to be found in a concentration of one part per million? These amazing bottles make molecular concentration and ppm contamination concepts more concrete for your students and offer many wonderful teaching opportunities.
Becker Bottle “One in a Million”—This large 3-L bottle contains one million tiny colored spheres. When you challenge students to find the one black sphere (1 ppm) among all the other colored spheres in the bottle, the concept of a million starts to become real. Other colored spheres (e.g., 10 ppm, 100 ppm) are significantly easier to find in the bottle.
Becker Bottle “One in a Million Too”—This bottle contains a lone black sphere mixed in with 999,999 all-yellow spheres and makes a vivid contrast to the 999,999 multicolored background spheres in the original Becker Bottle. Conduct a race to find the lone black sphere in each bottle. The same number of spheres are in each bottle, but what a difference in the race results! Order both Becker Bottles together (AP4863) and save. Concepts: Solution concentration, parts per million.
Time Required: 20 minutes
Materials Provided: Becker bottles and instructions.
See free video at flinnsci.com.
Air in a Bottle—Demonstration Model
By: Scott Newkirk
Front Range Community College, Fort Collins, CO
This amazing model will help your students visualize the gases that make up the air and clear up the misconception that there is more oxygen in the air than nitrogen. The 3-liter model contains one million differ- ent colored spheres. Each color represents a different gas found in the Earth’s atmosphere. As students examine the model, they are challenged to determine which color represents which gas. A great educational value that can be easily incorporated into your lessons for many years to come!
Crystal Growing Rock—
Chemical Demonstration Kit
By: The Flinn Staff
Amazing! Beautiful popcorn-like crystals actually growing out of a rock. How is this possible? In this demonstration, the instructor performs tests on a limestone rock to determine some of its chemical and physical properties. The rock is then placed in a dish of acetic acid solution and left undisturbed for several days. Watch as puffy crystals slowly appear to sprout from inside the rock! When enough crystals have grown, they are removed and tests are performed. Students record their observations and determine from the data whether the new crystals are the result of a chemical reaction. This demonstration is an effective and fun way to introduce the topics of crystals, chemical reactions and the effect of acids on carbonates. demon- stration notes, along with reproducible student worksheets, are included. Concepts: Crystal formation, chemical reactions, properties of acids. Time Required: 2 class periods, l0 minutes each. Rock crystals grow in about five days.
Materials Provided: Acetic acid solution, chalk, limestone rock, lithium chloride, weighing dishes.
Note: Some common household items and laboratory equipment are required but not provided.
Becker Bottles “One in a Million” AP4559, AP4854
Catalog No.
Description
Price/Each
AP4559
Becker Bottle “One in a Million”
$51.35
AP4854
Becker Bottle “One in a Million Too”
50.85
AP4863
Becker Bottles, Set of Two
94.85
Catalog No.
Description
Price/Each
AP7558
Air in a Bottle—Demonstration Model
$55.40
Air in a Bottle—Demonstration Model AP7558
SOLUTIONS AND SOLUBILITY—DEMONSTRATION KITS continued on next page.
Crystal Growing Rock—Chemical Demonstration Kit AP8715
Catalog No.
Description
Price/Each
AP8715
Crystal Growing Rock— Chemical Demonstration Kit
$26.55