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教学中发现有部分离子方程式对于学生来说异常难写,不知道练了多少次,再写时仍然出错,原因何在呢?经过深入思考发现根源在于前概念阻挠,前概念指通过经验积累获得的概念,是学习新知识的基础,也会对新知识的学习带来干扰。怎样才能挖出前概念、转化前概念呢?下面举几例。一、有意义的学习例1 Al与Na OH溶液反应错例:Al+2OH-Al O2-+H2↑分析此反应是铝的一条不寻常的基本
Some of the ion equations found in teaching are extremely difficult for students to write, do not know how many times to practice, and still make mistakes when they write again. What is the reason? After deep thinking, the root cause lies in the obstruction of the former concept. The former concept refers to the accumulation of experience. Concepts are the basis for learning new knowledge and will also interfere with the learning of new knowledge. How can we dig out the former concept and the pre-transformation concept? Here are some examples. I. Significant Learning Example 1 Reaction of Al with NaOH Solution: Al+2OH-Al O2-+H2↑ Analysis This reaction is an unusual basic of aluminum.