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演示实验的现象如果直观、准确,学生就能根据自己观察的实验现象得出合理的结论;相反,如果演示实验展现的是假象,就可能误导学生,不利于学生获得新知识。因此,演示实验对学生获得新知识非常重要。前不久,笔者参加了某校教研活动,听了一节“金属的化学性质”公开课。教师课上得很精彩,美中不足是所做的金属钠在空气中燃烧实验现象不够明显,不利于学生观察。
If the demonstration experiment is intuitive and accurate, the students can draw a reasonable conclusion based on the experimental phenomena observed by themselves. On the contrary, if the demonstration experiment shows the illusion, it may mislead the students and discourage students from acquiring new knowledge. Therefore, the demonstration experiment is very important for students to acquire new knowledge. Not long ago, I participated in a school teaching and research activities, heard a section “the chemical properties of metal ” open class. Teacher class is very exciting, the fly in the ointment is done by the metal sodium in the air combustion experiment phenomenon is not obvious enough, is not conducive to student observation.