Balloon—Toy of Many Colors

Abstract

Balloons are widely used in chemistry, in both classroom and laboratory scenarios. Balloon-related articles in JCE describe gas law experiments and demonstrations, large-scale molecular models, demonstrations of reaction rates and stoichiometry, hydrogen-filled balloon explosions with related safety concerns, and miscellaneous laboratory uses.

Piezas de construcción y globos: propuesta didáctica para trabajar contenidos de química con futuros Maestros de Educación Primaria

“…Los globos por su parte se usan también habitualmente para mostrar diversas propiedades y leyes de los gases o para ilustrar el resultado de ciertas reacciones químicas. Un listado detallado de experiencias se puede encontrar en el trabajo de profesor Williams (2005). También permiten realizar experimentos sencillos con los que mostrar fenómenos físicos como la conductividad térmica, la absorción de la luz o el efecto Joule (García-Molina, 2007).…”

Microfluidics for Personalized Reactions to Demonstrate Stoichiometry

“…Laboratory exercises have been designed to provide students opportunities to reinforce these concepts and involve one of three methods to visualize stoichiometry. These include reactions that produce a precipitate, , evolve gas, , or result in a color change. , The selection of one of these three approaches for a laboratory exercise is based on the time restrictions for the experiment and the availability of instrumentation. Although a precipitation reaction may be completed quickly, quantification of the precipitate in a laboratory setting is time-consuming because it requires each student to dry and then weigh the precipitate.…”

“…Reactions based on the generation of a gas require a means to capture the evolved gas. Large volumes of gas must be generated if volume measurements are to be made, and some reactions involve hazardous gases (e.g., hydrogen, methane, or ammonia). ,, …”

“…1 Laboratory exercises have been designed to provide students opportunities to reinforce these concepts and involve one of three methods to visualize stoichiometry. These include reactions that produce a precipitate, 3,4 evolve gas, 5,6 or result in a color change. 7,8 The selection of one of these three approaches for a laboratory exercise is based on the time restrictions for the experiment and the availability of instrumentation.…”

“…Large volumes of gas must be generated if volume measurements are to be made, and some reactions involve hazardous gases (e.g., hydrogen, methane, or ammonia). 5,9,10 Microfluidics offer the means to cost-effectively teach chemical concepts utilizing small reagent volumes in a short time. 11,12 Microfluidic devices provide a hands-on, personalized learning experience to conceptualize scientific principles.…”