8年级下第一章第6节《表示物质的符号》的教学反思
作者:心土芬芳 日期:2010-1-29 22:03:00
8年级下第一章第6节《表示物质的符号》的教学反思
 
        对照去年的课本来看,新课本把表示二氧化碳的元素组成图做了改变。原来是两个不同颜色的圆笑脸表示不同元素,很容易跟前面的原子模型图混淆,会让学生误以为元素和原子是一样的,都可以用个数表示。现在的图更科学。
   
        P21页的读图,让学生在方框你填写方框所在位置物质的化学式。雪和水学生都一致认为填H2O,但空中的这个方格学生的答案五花八门。有填氮气的,有填氧气的,有填二氧化碳的,而且都有自己的理由,比如氮气在空气中体积比例最大,氧气最有用等。严格来说都是对的,因为题目并没有做说明以及填图的要求。
        所以我只好引导学生说:既然是一副图上的3个空格,肯定有它内在的联系。谁能找出雪、水这2个填空的共同点和不同点呢?
        学生马上想到了:都用H2O表示,但一个是固态,一个是液态。
        举一反三,这里填什么最合适?我继续引导。
       H2O!学生异口同声地答道。
      为什么?我故意问。
       空气中有水蒸气,是水的气态,也填H2O。学生很高兴,因为猜出了我的意图。
        那课本出这个题目想说明什么呢?我将了一军。
        这下大家有傻眼了,面面相觑。想了半天,有个聪明的学生站起来:说明只要是同种物质,不管是处于哪种状态,它的化学式都是一样的。
        真棒。大家鼓掌。
 
        我觉得在课堂中做练习,不能单单要求学生做对就完事大吉。而要善于引导学生去琢磨出题的意图,进一步加深对概念的理解。
 
 
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