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新编六年制重点高中化学课本第二册第47页(实验2-7)中硝酸钾受热分解实验,按课本操作步骤不易观察到有气体放出,带火星的木条更不能燃烧。若把带火星的木炭放到盛有加热熔融的硝酸钾试管里,虽见木炭燃烧,但这不是氧气和木炭的反应,而是硝酸钾和木炭的反应,因此我们把硝酸钾改为硝酸钠不违背教材内容——活泼金属硝酸盐受热分解生成氧气和亚硝酸盐。
In the new six-year key high school chemistry textbook book 2, Book 47 (Experiment 2-7), potassium nitrate undergoes thermal decomposition experiments. According to the textbook operation procedure, it is not easy to observe the release of gas. The wooden strips with Mars can’t burn even more. If you put charcoal with Mars in a test tube containing heat and melting potassium nitrate, although you see charcoal burning, but this is not the reaction of oxygen and charcoal, but the reaction of potassium nitrate and charcoal, so we changed the potassium nitrate to sodium nitrate Does not violate the content of the teaching materials - the active metal nitrates are decomposed to generate oxygen and nitrite.