高一化学教材中钠与水的反应演示实验［实验4－3］存在以下两个问题：①一个反应两次操作较麻烦。特别是钠和水反应收集氢气的实验，教师用双手同时在烧杯内外操作，很不方便，学生也不易观察。②随着实验教学改革的深入，需要把一些演示实验改为边讲边实验。教材中的实验由于 The reaction demonstration experiment of sodium and water in the chemistry textbook of the high school chemistry [experiment 4-3] has the following two problems: 1 It is more troublesome to perform one reaction and two operations. In particular, the experiment of sodium and water reacting to collect hydrogen, the teacher used both hands to operate inside and outside the beaker at the same time. It was inconvenient and the students were not easy to observe. 2 With the deepening of experimental teaching reform, some demonstration experiments need to be changed to side-by-side experiments. Experiments in textbooks