人教版初中化学第一册学生实验六,学生在做二氧化碳的灭火实验时,往往集气瓶底已朝上,气体已倒尽,蜡烛火焰却不熄灭。这是什么原因呢？怎样才能做好该步实验？我们在指导学生的具体操作中总结出应主要掌握好以下几点,供老师们借鉴。１点燃蜡烛后,应立即倾倒二氧化碳,否则由于蜡 People’s Education Press, Junior Chemistry, Book 1 Student’s Experiment 6. When students are doing carbon dioxide extinguishing experiments, the bottom of the gas cylinder is always up, the gas is completely drained, and the candle flame is not extinguished. What is the reason for this? How can we do this experiment? In the specific operation of guiding students, we concluded that the following points should be mastered for teachers’ reference. 1 Immediately after lighting the candle, dump carbon dioxide, otherwise wax