|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2007
>
October
> |
|
In the Classroom
|
|
JCE DigiDemos: Tested Demonstrations
|
|
Incomplete Combustion of Hydrogen: Trapping a Reaction Intermediate
|
|
|
Bruce Mattson and Trisha Hoette
Department of Chemistry, Creighton University, Omaha, NE 68178
checked by Michelle S. Applebee
Department of Chemistry, Elmhurst College, Elmhurst, IL 60126
|
|
October 2007
Vol. 84 No. 10
p. 1668
|
|
|
|
| Abstract |
|
The combustion of hydrogen in air is quite complex with at least 28 mechanistic steps and twelve reaction species. Most of the species involved are radicals (having unpaired electrons) in nature. Among the various species generated, a few are stable, including hydrogen peroxide. In a normal hydrogen flame, the hydrogen peroxide goes on to further oxidation resulting in water. In this classroom demonstration, a hydrogen flame is played across the face of an ice cube and the combustion is quenched in an incomplete state. The solution that results contains aqueous hydrogen peroxide that can be tested with two simple chemical tests.
|
| Supplement |
A QuickTime movie of this demonstration is available..
|
|
| More Information |
|
Citation |
Mattson, Bruce; Hoette, Trisha. J. Chem. Educ. 2007, 84, 1668.
|
|
Keywords |
Demonstrations; Descriptive Chemistry; First-Year Undergraduate / General; Free Radicals; Gases; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Hydrogen; Inorganic Chemistry; Molecular Properties / Structure; Reactive Intermediates; Upper-Division Undergraduate
|
|
History |
Created:
Last Updated: |
8/20/2007
9/7/2007
|
|
|
|
|
|
 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
|
|
| |
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2007
>
October
> Page
1668
|
|
|
| Chemistry Teacher Connection |
|
The "Chemistry Teacher Connection" (CTC) is especially for high school chemistry teachers. For only $40/year, it offers an online-only subscription to CLIC along with membership in the Division of Chemical Education, normally $65/year. CTC subscribers receive access to all articles and supplements from 1996 through the current issue.
|
| C&EN CLICs |
|
Through special arrangement with the ACS, JCE High School CLIC is now able to provide subscribers with online access to Chemical & Engineering News articles that have been selected specifically for secondary science instructors and their students.
|
JCE Collections Available
|
Occasionally, collections of JCE back issues become available for donation to individual teachers, schools, or libraries. JCE matches collections with interested recipients. Recipients pay shipping costs or pick up the collection.
|
| Contributions Welcome |
| JCE welcomes your submission |
| Fishing for New Ideas |
 Always in the
process of
improving, CLIC
welcomes ideas and comments.
Email Us |
|
