电化学(原电池和电解池)知识是历年高考化学试题中的必考知识点,所涉及的内容比较常规,有电极的判断,电极反应式的书写,离子的移动方向,以及与电化学相关的计算等.本文以电极反应式的书写和离子移动方向为例说明方法,想呈现给读者的是:解决此类题目,方法可能多种多样,但万变不离其宗,只需抓住本质,以不变应万变.一、透过现象看本质——谈电极反应式的书写虽然每年考题出现的背景不同,但只要是考电化学,即是考氧化还原反应.以原电池为例,可首先从氧化还原反应角度 Electrochemical (primary battery and electrolytic cell) knowledge is the knowledge of the chemical examination questions over the years the college entrance examination knowledge points, the content is more conventional, the judge electrode, electrode reaction type of writing, the direction of ion movement, and electrochemical Etc. In this paper, the method of electrode reaction writing and ion movement is taken as an example to illustrate the method to be presented to the reader: to solve such problems, the methods may be varied, but they are always the same, , In order to maintain the status quo and change. First, look at the essence through the phenomenon - to talk about the writing of the electrode reaction Although the exam background appears different each year, but as long as the test electrochemical, that is, the test oxidation reduction reaction. , First from the redox reaction point of view