"Serpentes de Faraó": a história de uma brincadeira pirotécnica e sua aplicabilidade no ensino de princípios químicos básicos

Química Nova

Marcius A. Ullmann²  Wilhelm M. Wallau²  Daniela Bianchini²  Andressa Da C. Schneid¹  Lara M. P. Montenegro² 

[1] ,Universidade Federal de Pelotas Centro de Ciências Químicas, Farmacêuticas e de Alimentos Capão do Leão RS ,Brasil

关键词: Pharaoh's snake;    thermal decomposition;    carbon compounds;   

DOI  :  10.5935/0100-4042.20140176

来源: SciELO

【 摘 要 】

Fun methodologies developed with alternative materials for teaching chemical reactions of carbon are interesting activities for discussing concepts of stoichiometry and thermochemistry. The decomposition of organic matter, CO2 production and coal formation can be demonstrated in the experiment "Pharaoh´s snake". This experiment is attractive since the simple combustion of sucrose generates a peculiar structure of coal. This paper proposes a simple methodology for making the sugar tablets used in the experiment and contextualizes the experimental observations with the chemical reaction of carbon which leads to coal and to the thermodynamics involving combustion processes.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License