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高二化学课本里介绍了原电池和金属腐蚀及防护的初步知识,关于构成原电池的条件,教材里没有明确说明。既然把原电池同金属的腐蚀联系起来讲,那么,说明构成原电池的条件,使学生弄清楚在什么条件下可以形成原电池而发生金属的腐蚀就是很必要的。事实上,许多教师在教学上正是这么做的。通常把构成原电池的条件归纳为以下三条:①有两种活泼性不同的金属(或炭棒)做电极。其中较活泼的金属作为原电池的负极。
In the high school chemistry textbooks, preliminary knowledge of the corrosion and protection of primary batteries and metals was introduced. The conditions for the formation of primary batteries are not clearly stated in the textbooks. Since the original battery is related to the corrosion of metal, then it is necessary to explain the conditions that constitute the primary battery and make it clear that under what conditions the primary battery can be formed and metal corrosion occurs. In fact, many teachers do exactly that in teaching. The conditions that make up primary batteries are generally grouped into the following three: 1 There are two kinds of metals (or carbon rods) that are differently active as electrodes. One of the more active metals is the negative electrode of the primary battery.