Your browser doesn't support javascript.
loading
Misconceptions in the Exploding Flask Demonstration Resolved through Students' Critical Thinking.
Spierenburg, Rick; Jacobse, Leon; de Bruin, Iris; van den Bos, Daan J; Vis, Dominique M; Juurlink, Ludo B F.
Afiliação
  • Spierenburg R; Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands.
  • Jacobse L; Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands.
  • de Bruin I; Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands.
  • van den Bos DJ; Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands.
  • Vis DM; Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands.
  • Juurlink LBF; Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands.
J Chem Educ ; 94(9): 1209-1216, 2017 Sep 12.
Artigo em Inglês | MEDLINE | ID: mdl-28919643
ABSTRACT
As it connects to a large set of important fundamental ideas in chemistry and analytical techniques discussed in high school chemistry curricula, we review the exploding flask demonstration. In this demonstration, methanol vapor is catalytically oxidized by a Pt wire catalyst in an open container. The exothermicity of reactions occurring at the catalytic surface heats the metal to the extent that it glows. When restricting reactant and product gas flow, conditions may favor repetitive occurrence of a small explosion. We show how mass spectrometry and infrared spectroscopy allow for unravelling the chemical background of this demonstration and discuss various ideas on how to use it in a classroom setting to engage students' critical thinking about chemical research. Along the way, we show that two commonly published ideas about the chemical background of this demonstration are incorrect, and we suggest simple tests that may be performed in a high school setting either as an addition to the demonstration or as a student research project.

Similares

MEDLINE

...
LILACS

LIS

Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Chem Educ Ano de publicação: 2017 Tipo de documento: Artigo País de afiliação: Holanda