在现行高一化学课本第三章第五节中,安排了几组试管反应的演示实验和分组实验五。都是做同周期同主族元素金属性和非金属性速变规律的实验。前者是配合教师讲解的“演示实验”,后者是巩固已学知识的“学生实验”。两者都做,需2～3个课时。再者,由于试管反应的演示,剂量小,现象不明显,不易观察。这样既影响课堂教学效果,又浪费时间。学生学习的主动性和积极性也不能更好地发挥。现将课堂讲授、演示和学生实验三者结合,重新组编成一堂用六十分钟左右的“边讲边实验”课。教师讲解有力,学生学的生动活跃。人人独立操作,个个观察思考,印象深,记得牢。 In the third section of Chapter 3 of the current High School Chemistry textbook, several sets of demonstration experiments and grouping experiments of test tube reactions are arranged. All of them are experiments with the periodicity of the metal and nonmetal transitions of the main group elements. The former is a “demonstration experiment” with the teacher, and the latter is a “student experiment” that consolidates the learned knowledge. Both do two to three hours. Moreover, due to the demonstration of the test tube reaction, the dose is small, the phenomenon is not obvious, and it is not easy to observe. This will not only affect the effectiveness of classroom teaching but also waste time. Students’ initiative and enthusiasm for learning cannot be better played. Classroom lectures, demonstrations, and student experiments are now combined and reorganized into a group of “learning and experimenting” lessons that take about sixty minutes. The teachers explained their strengths and their students learned vividly. Everyone operates independently, all observing and thinking. I am deeply impressed. I remember it.