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书写原电池的电极反应式是原电池教学的重要内容,又是化学试题命题的一个热点,也是学生感到疑惑、难度较大的知识点。分析和书写电极反应式是对原电池原理认识的进一步深化和发展,能够促进学生对原电池原理的掌握。一、判断原电池电极(正极、负极)的依据1.多数情况下不活泼金属或非金属导体材料做正极,活泼金属做负极;2.电子流入的极为正极,电子流出的极为负极;3.电流方向由正极流向负极;4.发生还原反应的为正极,发生氧化反应的为负极;
The original battery electrode reaction is an important part of teaching the original battery, but also a hot topic of chemical questions, but also students feel puzzled, more difficult knowledge. Analysis and writing Electrode reaction is the understanding of the principle of the original battery to further deepen and develop, to promote students master the principle of the original battery. First, determine the original battery electrode (positive, negative) basis 1. In most cases inactive metal or non-metallic conductor material to do positive, active metal to do negative; 2.Electron inflow of very positive, very outflow of electrons; The current direction from the positive electrode to the negative electrode; 4. The reduction reaction occurs for the positive electrode, the oxidation reaction occurs for the negative electrode;