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一、问题的提出在石棉网上点燃金属钠生成 Na_2O_2的实验,从人民教育出版社《高级中学课本化学(必修)第一册》第一版、《全日制普通高级中学教科书(必修)化学第一册》,到苏教版《普通高中课程标准实验教科书·化学1》,近20年了,该实验设计一成不变,但实验效果并不理想,主要存在下列问题:1.金属钠开始燃烧后,一道白烟冲天而起,反应很快结束,黄色火焰稍纵即逝。2.反应后留下的产物不多,且淡黄色不明显。二、实验改进在石棉网上做钠的燃烧实验,体系过于敞开,导致燃烧过
I. Proposal of the problem The experiment of igniting sodium metal to produce Na 2 O 2 on asbestos network was carried out by the People’s Education Publishing House, the first edition of the “first grade textbook chemistry (required)” of the People’s Education Press, and the “first-class general high school textbook (required)”. The book, to the Soviet Union “normal high school curriculum standard experiment textbooks, chemistry 1”, nearly 20 years, the experimental design is immutable, but the experimental results are not ideal, the main problems are as follows: 1. After the sodium metal began to burn, together The white smoke skywards and the reaction is over quickly. The yellow flame is fleeting. 2. There are not many products left after the reaction, and pale yellow is not obvious. Second, the experimental improvement in the asbestos network to do sodium combustion experiment, the system is too open, resulting in burning