部编初中三年级化学教材中有一个氯气与氢气在光照下发生化合的演示实验。这个实验较难掌握,往往不易做成功。我对这个实验作了一些探索,摸到一些关键,今介绍如下。 The chemistry textbook for the third grade junior high school has a demonstration experiment of combining chlorine and hydrogen under light. This experiment is harder to master and often less successful. I made some explorations of this experiment and touched on some key points. This is introduced as follows.