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关于原电池,高考常见的考点不外乎就是考查原电池的正负极判断、电子流向、离子流向、p H的变化判断、电子转移的多少等,重点是电极的书写,难点也是电极的书写。下面我谈点自己多年来对这些知识点的看法:解原电池的题的基本是电极反应的书写,在书写电极反应时有些情况值得考生注意:1.烃或烃的含氧衍生物和氧气在熔融碳酸盐形成的原电池(以甲烷为代表)正极:O2+4e-=2O2-就是错的。原因是熔融碳酸盐中没有O2-,而是O2+4e-+2CO2=2CO32-,也就是要围绕熔融盐的碳酸根-而写。
About the original battery, college entrance examination common test point nothing more than to examine the positive and negative judgment of the original battery, electron flow, ion flow, p H change judgment, the number of electron transfer, etc., the focus is the writing of the electrode, the difficulty is the writing of the electrode . Here I talk about their own point of view of these knowledge points over the years: the problem of the original battery solution is the writing of the electrode reaction, the writing electrode reaction is worth some candidates note: 1. Oxygen derivatives of hydrocarbons or hydrocarbons and oxygen In the formation of molten carbonate primary battery (represented by methane) positive: O2 + 4e- = 2O2- is wrong. The reason is that there is no O2- in the molten carbonate, but O2 + 4e- + 2CO2 = 2CO32-, that is to say around the carbonate of the molten salt.