JCE Online Journal of Chemical EducationDivision of Chemical Education, American Chemical SocietyAmerican Chemical Society
 | Subscriptions  | Software Orders  | Support  | Contributors  | Advertisers  | 

JCE Print
   Current Issue
 Previous Issues
 Supplements
 Search JCE Index

JCE Digital Library
   ChemInfo
 DigiDemos
 Featured Molecules
 LivTexts
 LrnCom
 QBank
 SymMath
 WebWare

JCE Software
   Latest Releases
 Software & Video
 Downloads
 Support

Only@JCE Online
   JCE Online Store
 JCE HS CLIC
 JCE Discussion Forums
   Biographical Snapshots
 ChemEd Resource Shelf
 Featured Molecules
 Hal's Picks
 Project Chemlab
 Reviewed WWW Sites
 "Web-Ed" Articles

About JCE
   Features
 Publications
 Operations
 Outreach
 Contact Us


  Home > JCE Print > Journal of Chemical Education > Issues > 2006  > August  >
In the Classroom
JCE DigiDemos: Tested Demonstrations
Two "Gas-in-a-Bag" Reactions To Show the Predictive Power of the Relative Acid–Base Strength Chart
Brett Criswell
Central Columbia High School, Bloomsburg, PA 17815

checked by:

Carole Bennett
Sickles High School, Tampa, FL 33626

Holly M. Bevsek
Department of Chemistry, Susquehanna University, Selinsgrove, PA 17870

Cover
August 2006
Vol. 83 No. 8
p. 1167
Abstract
High-school chemistry curricula have often been maligned for being too long on theory and too short on applied chemistry. Certainly, very little consideration is given in most curricula to the rich arena of descriptive chemistry, particularly helping students develop the skills of being able to predict products of chemical reactions and of using resource tables to reason which products are most likely to form. This article describes a relatively simple demonstration in which two different pairs of solid chemicals are mixed in two different Ziploc bags in the presence of a small quantities of water. In both cases, the chemicals react to produce gases that are trapped in and fill up the bags. Students are informed that the reactions producing those gases are Brønsted–Lowry acid–base type reactions. Given that all four chemicals have the potential to be amphoteric, students must determine which member in each pair will act as the acid and which as the base. Making this determination—and therefore the determination of the products—requires students to apply an understanding of the Relative Acid–Base Strength chart.
More Information
*  Citation
 Criswell, Brett. J. Chem. Educ. 2006 83 1167.
*  Keywords
 Acids / Bases; Aqueous Solution Chemistry; Bronsted-Lowry Acids / Bases; Demonstrations; Descriptive Chemistry; First-Year Undergraduate / General; High School / Introductory Chemistry; Inquiry-Based / Discovery Learning
*  History
 Created:
Last Updated:		 6/21/2006
6/27/2006
<< Previous Article Table of Contents Next Article >>
  Home > JCE Print > Journal of Chemical Education > Issues > 2006 > August > Page 1167


Subscriptions
 Subscription Info
 Order Forms

JCE HS CLIC

Our Secondary School editors work hard to distill all the JCE materials to produce a fraction of particular interest to high school teachers. We call it CLIC.
 JCE HS CLIC

Contributions Welcome
JCE welcomes your submission
 Contributors' Corner

Advertisers
In recent years we have worked hard to better match our advertisers with our readers. When shopping for chemistry education materials, visit our advertisers' WWW sites first.
 Recent Advertisers

Be An Ambassador
Take JCE along on your outreach missions. Copies of the Journal, guest access to JCE Online, our publications catalog, and more are available for your participants.
 Outreach with JCE

Comments to
jceonline@chem.wisc.edu		 Copyright © Division of Chemical Education, Inc., American Chemical Society.
All rights reserved.