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辩证思维是逻辑思维发展的高级阶段,离开辩证思维“就会连两件自然的事实也联系不起来,或者连两者之间所存在的联系都无法了解”. 当前中学化学的辩证思维教学水平如何呢?笔者曾在几所中学作过测试,对象是作过浓硫酸性质实验不久的高中学生,试题是:稀硫酸和铜片一起加热可以观察到什么现象?大多数学生的回答是:“无变化”.可见,他们不能通过“加热”将稀硫酸和浓硫酸联系起来.再如合成氨适宜条件的选择、盐的水解等,历来是教学的难点,其实难就难在这是辩证思维阶段的问题,而我
Dialectical thinking is the advanced stage of the development of logical thinking. Without the “dialectical thinking”, even two facts of nature cannot be connected, or even the connection between the two cannot be understood. “ The current teaching level of dialectical thinking in middle school chemistry How do I? The author has been tested in several high schools, the target is a high school student who has been a sulfuric acid nature experiment, the question is: what can be observed when dilute sulphuric acid and copper heating together? Most students answer: ” “No change”. It can be seen that they cannot connect the dilute sulfuric acid and concentrated sulfuric acid by “heating”. Another example is the choice of suitable conditions for the synthesis of ammonia, the hydrolysis of salt, etc., which has always been a difficult teaching point. In fact, it is difficult to be difficult in this phase of dialectical thinking. The problem while I