论文部分内容阅读
氧化还原反应是中学化学教材的重点和难点之一。现发表几位教师的教学体会和氧化还原方程式的配平法,以供参考。一、利用图表,讲清概念,找出规律。在教完新课以后的复习阶段,可将氧化还原反应的基本类型、氧化剂和还原剂的相对性等问题图解于下:利用上图可以联系旧知识(原子、离子)复习新知识(氧化还原),由现象(化合价的变化)看到本质(电子得失)。还可利用上、下、左、右的关系归纳氧化还原反应的类型。具体说来,作用有三:
Redox reaction is one of the key and difficult points in the middle school chemistry textbook. The teaching experience of several teachers and the balancing method of the oxidation-reduction equation are published for reference. First, use the charts to clarify concepts and find out the rules. In the review phase after the completion of the new lesson, the basic types of redox reactions, the oxidants and the relativities of reductants can be illustrated in the following: Using the above diagram, you can contact old knowledge (atoms, ions) to review new knowledge (redox) ), see the essence (electronic gains and losses) from the phenomenon (change in valence). It is also possible to use the up, down, left, and right relationships to summarize the type of redox reactions. Specifically, there are three roles: