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为了学生能从根本上理解化学能与电能之间的转化,真正领会原电池在实际生活中的应用,在《化学2》第二章第二节“化学能与电能”的基础上,采用“诱导—探究—实验—分析—推理—归纳”的方法,进一步介绍原电池的组成和工作原理。充分尊重学生的认知结构,通过对单液电池效率的探究,引出半电池、盐桥、内外电路等概念,通过对旧知识的归纳,引出问题,再在解决问题的过程中不断引发新问题,层层递进,让学生从本质上了解盐桥原电池的工作原理,相关教学过程如下。[引入]使用的手机有电池,用的随身听有电池,带的石英
In order that students can fundamentally understand the conversion between chemical energy and electric energy and truly understand the application of primary batteries in real life, on the basis of the second chapter, “Chemistry 2”, “Chemical Energy and Electric Energy” Adopting the method of “inducing - exploring - experiment - analyzing - reasoning - inducing”, the composition and working principle of primary battery are further introduced. Fully respect the cognitive structure of students, through the exploration of the efficiency of single-cell battery, leads to the concept of half-cell, salt bridge, internal and external circuits and so on. Through the induction of old knowledge, leads to problems, and then constantly solves new problems in the process of solving problems , Progressive layers, so that students from the nature of the original salt bridge battery works, the teaching process is as follows. [Introduced] The use of cell phones have batteries, Walkman with batteries, with quartz