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氢气在空气中燃烧观察颜色的演示实验一直是初中化学教学中难度较大的实验之一。实验中使用玻璃导管点燃氢气,由于受玻璃中钠元素的黄色焰色干扰,学生很难观察到氢气的淡蓝色火焰,严重影响了演示实验效果。多年来,许多教师对该实验进行了探索与思考,但实验效果并不理想。为此,笔者对实验装置进行了改进,改进后能明显地观察到氢气燃烧的淡蓝色火焰。
Hydrogen combustion in the air to observe the color of the demonstration experiment has been junior high school chemistry teaching one of the more difficult experiments. In experiments, glass tubes were used to ignite hydrogen gas. Due to the yellow flame color of sodium in the glass, it was hard for students to observe the light blue flame of hydrogen, which seriously affected the experimental results. Over the years, many teachers have explored and thought about this experiment, but the experimental results are not satisfactory. To this end, the author has made improvements to the experimental device, which can obviously observe the light blue flame of hydrogen combustion.