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化学是一门以实验为基础的学科,中学化学教材体现了这一特征,安排了大量的课堂演示实验和一定数量的学生实验。按教材节数和必做演示实验数之比,初中约为1:2,高中约为1:1.5。我们在教学实践中体会到,这样的安排对加强学生的双基训练是必要的,教师应该认真做好这些演示实验。同时,从全面培养学生的能力来看,教材规定的演示实验还存在数量不够和某些内容效果不佳而需要改进的问题。对此,我们几年来进行了一些探索,现综合如下,和大家一起研究。
Chemistry is an experiment-based discipline. High school chemistry textbooks embody this feature, arranging a large number of classroom demonstration experiments and a certain number of student experiments. According to the ratio of the number of textbooks to the number of demonstrations that must be done, junior high school is about 1:2, and high school is about 1:1.5. We learned from our teaching practice that such an arrangement is necessary to strengthen students’ double-basic training. Teachers should do a good job of these demonstration experiments. At the same time, from the perspective of comprehensively cultivating students’ ability, there are still problems in the demonstration experiment prescribed by the teaching materials, which are insufficient in quantity and ineffective in certain contents. In this regard, we have carried out some explorations over the past few years. We will now synthesize the following and study it together with you.