利用手持技术探究原电池“电极反转”双模型的反应机理

Exploring Reaction Mechanism of"Electrode Inversion"Dual Model of Galvanic Cells Using Handheld Technology

基于手持技术表征原电池基准态与极端态工作原理的差异性,继而探究铁和铝分别与铜在浓硝酸中构成的2种极端态原电池在发生电极反转时硝酸浓度的临界值。通过双模型对比实验,帮助学生更加直观、准确、深入地建构原电池模型,同时丰富学生对元素周期律、金属活动性以及氧化还原反应等关联性知识的认知与理解。

This paper was based on handheld technology to characterize the differences in the working principles between the reference state and extreme state of primary batteries,then explored the critical value of nitric acid concentration in the electrode reversal of the two extreme galvanic cells composed of iron and aluminum respectively with copper in concentrated nitric acid.Through the two-model comparison experiment,it helped students construct the galvanic cell model more intuitively,accurately and deeply,and enriched students'cognition and understanding of the correlation knowledge such as the periodic law of elements,metal activity and redox reaction.