“发现法”的一个重要特点是十分重视学习的欲望以及怎样才能刺激这个欲望。“按照理想,学习的刺激,乃是对所学材料的兴趣。”这就要求教师一开始就带领学生进入诱人的悬念中去,发动学生探索性思维,引导他们走上“发现”的途径。 下面谈谈我用发现法试教“钠”的体会。在教学中,我一开始就向学生演示“水点火”的实验:在坩埚中放一小块金属钠,迅速倒入2—3毫升乙醚,然后滴入3—4滴水,坩埚里便出现火焰。学生观察了实验现象后,都感到惊奇,表现出一种想探究其原因的迫切感。我接着说:水不 An important feature of the “discovery method” is to attach great importance to the desire to learn and how to stimulate this desire. “According to ideals, the stimulation of learning is an interest in the materials they learn.” This requires teachers to lead students into seductive suspense from the outset, to launch students’ exploratory thinking, and guide them to the path of “discovery”. . Let’s talk about my experience of using trials to teach “sodium”. In the teaching, I demonstrated the experiment of “water ignition” to students from the beginning: Put a small piece of metal sodium in a pot, quickly pour 2-3 ml of ether, and then drip in 3-4 drops of water. . After observing the experimental phenomena, students were surprised and showed a sense of urgency to explore the causes. I went on to say: Water is not