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对于刚接触化学的初中生来说,化学实验更具真实性,是培养学生观察能力及提高实验综合素质的重要手段,也是学生学习、理解并运用化学知识必不可少的途径。对此,笔者结合自己的学习心得,并在老师的指导下改进了部分初中实验,现简介如下。一、氢气燃烧实验改进一般而言,氢气的可燃性实验常设计为在排水导管尖嘴处点燃氢气,但流速慢常导致氢气燃烧时的火焰小,且因为使用的是玻璃材质,所以该实验仅能在点燃瞬间看到淡蓝色火焰闪现;而学生在玻璃导管口
For junior high school students who have just come into contact with chemistry, the chemistry experiment is more authentic. It is an important means to train students’ observation ability and improve the overall quality of experiment. It is also an indispensable way for students to learn, understand and use chemical knowledge. In this regard, I combine their own learning experience, and under the guidance of the teacher to improve some of the junior high school experiments, are as follows. I. Improvements in Hydrogen Combustion Experiments In general, the flammability test of hydrogen is often designed to ignite hydrogen gas at the discharge conduit tip, but the slow flow rate leads to a small flame when the hydrogen is burned. Since the glass is used, the experiment The light blue flame flashed only in the moment of ignition; the pupil was in the glass duct