Page 44 - Demo

Flinn Lab Activities and Demonstrations
Atomic Structure—Laboratory Kits, continued
Discovering the Charge of an Electron— Analogy of Millikan’s Oil-Drop Experiment—Student Laboratory Kit By: Earl Pearson
Middle Tennessee State University, Murfreesboro, TN
The electron, an elementary particle of matter, has a negative charge. Exactly how much electrical charge does one electron have? In the early twentieth century, Robert Millikan quantified the charge of a single electron through a series of carefully designed experiments using electrically-charged oil drops. In this analogous activity, BBs attracted to magnets of various sizes represent electrons on the oil drops. After making careful measurements, students analyze the data to determine the mass of one BB—using the same reasoning employed by Millikan in his oil-drop experiments—without weighing any known quantity of BBs! A great activity to help students understand the development of the atomic theory of matter from a historical perspective.
Complete for 30 students working in pairs. Balances with 0.01-g precision are recommended.
Electron Structure—1s Orbital—
Super Value Laboratory Kit
By: Gary Schiltz, Retired
Glenbard West High School, Glen Ellyn, IL
Model the difficult concepts of probability and electron structure by having students “roll the dice.” In this activity, the simple roll of the dice is used to simulate the results of complex wave mechanical calculations for the energy of the 1s electron. Students record the numbers generated by rolling a pair of dice fifty times, and then analyze the statistics to create a model of the 1s orbital. Eliminate the “uncertainty principle” when it comes to understanding electron structure. Includes reproduc- ible student handouts and worksheets, detailed background information, and Instructor’s Notes with sample data and answers to questions.
Super Value Kit is complete for 15 student groups. All materials are reusable.
Introduction to Electron Structure—
Student Laboratory Kit
By: The Flinn Staff
Help students understand the basics of electron structure with this simple and straightforward lab activity. In this activity, 15 workstation “atoms” are constructed, each consisting of an energy level diagram, a symbol for a neutral atom or ion, and bingo chips representing elec- trons. Students correctly fill the energy levels with the proper number of electrons for each neutral atom or ion. By visualizing the electron energy levels, students gain a better understanding of electron structure. They also learn why atoms tend to become positively or negatively charged, as well as the role electrons play in chemical reactions.Includes enough materials to construct 15 workstation “atoms,” reproducible student handouts, and Instructor’s Notes.
Complete for 30 students working in pairs.
ATOMIC STRUCTURE—LABORATORY KITS continued on next page.
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Discovering the Charge of an Electron—Analogy of Millikan’s Oil-Drop Experiment—Student Laboratory Kit AP7350
Catalog No.
Description
Price/Each
AP7350
Discovering the Charge of an Electron— Analogy of Millikan’s Oil-Drop Experiment— Student Laboratory Kit
$33.00
Electron Structure—1s Orbital—Super Value Laboratory Kit AP6620
Catalog No.
Description
Price/Each
AP6620
Electron Structure—1s Orbital— Super Value Laboratory Kit
$14.20
Catalog No.
Description
Price/Each
AP6608
Introduction to Electron Structure— Student Laboratory Kit
$39.40
Introduction to Electron Structure—Student Laboratory Kit AP6608