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氧化——还原反应方程式的配平,在中学化学教学中是—个难点。我在多年教学实践中,采用了交叉系数配平法进行教学,效果较好,现介绍如下: 一、配平原理:(略) 二、配平步骤举例: 第一步:正确写出反应物与生成物的分子式,二者之间划“——”线,标出反应前后相关元素化合价的变化。第一: 第二步:用“↑”和“↓”在还原剂和氧化剂的下方标出还原剂所含元素化合价升高的总数和氧化剂所含元素化合价降低的总数。
Oxidation-balancing of the reduction equation is a difficult point in chemistry teaching in middle school. In my teaching practice for many years, I used the cross-coefficient balancing method to teach. The results are as follows: 1. Principle of trimming: (omitted) 2. Example of balancing procedure: Step 1: Correctly write out reactants and products The molecular formula, the “-” line between the two, marked before and after the reaction of the relevant elements of the valence changes. First: Step 2: Use “↑” and “↓” below the reducing agent and oxidant to mark the total amount of elemental valences that the reducing agent has increased and the total amount of elemental valence that the oxidant contains.