气体的制取和性质实验,占整个中学化学实验中的比重很大。大多数气体物质(如Cl_2、HCl、HBr、HI、H_2S、HF、SO_2、NO、NO_2、NH_3、CO等等)都是有毒、有害、有腐蚀性的气体(以下称“有毒气体”),无论是演示实验,学生实验都会接触到。如果实验室通风不良,会对人体危害很大。尤其是一些难以控制反应速度的实验,有毒气体逸出的更多。如氯气的性质实验,教师先要制取几瓶甚至十几瓶氯气(以一个人教三个班计算),就会感到口干舌燥,头昏目眩,接着又要在课堂上演示氯气的性质,这 Gas preparation and property experiments accounted for a large proportion of chemical experiments in middle schools. Most gaseous substances (such as Cl2, HCl, HBr, HI, H_2S, HF, SO_2, NO, NO_2, NH_3, CO, etc.) are poisonous, harmful and corrosive gases (hereinafter referred to as “toxic gases”) ), whether it is a demonstration experiment, student experiments will come into contact. If the laboratory is poorly ventilated, it will be very harmful to the human body. Especially for experiments where it is difficult to control the reaction rate, toxic gases escaped more. If the nature of the chlorine experiment, the teacher must first obtain a few bottles or even a dozen bottles of chlorine gas (in one class to teach three classes), you will feel thirsty, dizzy, and then in the classroom to demonstrate the chlorine Nature, this