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

Química Nova

Marcius A. Ullmann¹  Wilhelm M. Wallau¹  Lara M. P. Montenegro¹  Daniela Bianchini¹  Andressa da C. Schneid² 

[1] Universidade Federal de Pelotas;Universidade Federal do Rio Grande do Sul;

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

DOI  :  10.5935/0100-4042.20140176

来源: DOAJ

【 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】

Unknown