论文部分内容阅读
初中化学[实验2—5],即纯净的氢气在空气中燃烧,呈现淡蓝色火焰的实验,因所选用仪器和反应条件的影响,经常出现下列现象: (一)当氢气流不足时,火焰近似无色。学生只能看到罩在尖嘴玻璃导管处小烧杯内壁有液滴产生,而不见任何火焰。 (二)当玻璃中钠离子产生的黄光过强时,氢焰中微弱的蓝光完全被黄光所隐蔽,而使
Junior high school chemistry [Experiment 2-5], that is, pure hydrogen gas is burned in air, and the experiment of light blue flame is presented. Due to the influence of selected instruments and reaction conditions, the following phenomena often occur: (1) When the hydrogen flow is insufficient, The flame is nearly colorless. Students can only see droplets on the inner wall of the small beaker at the tip of the glass pipe, without seeing any flame. (b) When the yellow light produced by sodium ions in the glass is too strong, the weak blue light in the hydrogen flame is totally hidden by the yellow light, and