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两则化学实验改进河北承德民族师范学校闫小敏一、铜与浓硝酸反应师范化学教材中的课堂演示和学生实验都安排了“铜和浓硝酸反应”的实验。这些实验都是暴露在空气中进行的，反应产生的二氧化氮气体散布在室内。众所周知，二氧化氮气体是有刺激性气味的有毒气体，不尽快排...
Two Chemical Experiment Improvements Yan Xiaomin, Chengde National Normal School, Hebei Province. The classroom demonstrations and student experiments in the normal chemistry chemistry of copper and concentrated nitric acid have arranged experiments for the “response of copper and concentrated nitric acid”. These experiments were conducted in the air, and the nitrogen dioxide gas produced by the reaction was scattered indoors. As we all know, nitrogen dioxide gas is a toxic gas with irritating odor, not as soon as possible...