Experimenting with a Visible Copper–Aluminum Displacement Reaction in Agar Gel and Observing Copper Crystal Growth Patterns To Engage Student Interest and Inquiry

Xinhua Xu ^[1] ; Meifen Wu ^[1] ; Xiaogang Wang ^[1] ; Yangyiwei Yang ^[1] ; Xiang Shi ^[1] ; Guoping Wang ^[2]
1. [1] Tongji University
  
  Tongji University
  
  China
2. [2] Zhejiang University
  
  Zhejiang University
  
  China
Localización: Journal of chemical education, ISSN 0021-9584, Vol. 93, Nº 9, 2016, págs. 1612-1615
Idioma: inglés
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Resumen
- The reaction process of copper–aluminum displacement in agar gel was observed at the microscopic level with a stereomicroscope; pine-like branches of copper crystals growing from aluminum surface into gel at a constant rate were observed. Students were asked to make hypotheses on the pattern formation and design new research approaches to prove their hypotheses. Results of the experiments designed by students well proved the existence of microcells in reaction system, which caused continuous growth of copper branches. The whole experimental teaching process motivated students by stimulating their interest and enthusiasm.