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在高一化学新课程的教学中,很有必要补充2个演示实验,1个是硫化氢与二氧化硫相互反应的实验,另1个是氯单质与硫化氢置换反应的实验。这2个实验有利于学生理解和掌握硫化氢的性质以及同周期元素性质的递变知识,但2个实验不易完成,其主要原因是实验装置较复杂,有毒气体的产生容易污染环境。笔者设计了1个全封闭实验器,经过多次实验,效果很好,现介绍如下:
In the teaching of the new chemistry chemistry curriculum, it is necessary to add two demonstration experiments. One is the experiment of the interaction between hydrogen sulfide and sulfur dioxide, and the other is the experiment of the displacement reaction between chlorine element and hydrogen sulfide. These two experiments are beneficial for students to understand and grasp the nature of hydrogen sulfide and the knowledge of the gradual changes of the nature of elements in the same cycle, but the two experiments are not easy to complete. The main reason is that the experimental device is more complex and the production of toxic gases is likely to pollute the environment. The author designed a fully enclosed experimental device, after many experiments, the effect is very good, is introduced as follows: