学生在做初中化学有关气体制取的实验题时,需要对装置的气密性进行检查,由于仪器装置的检查方法不同,而且部分装置学生从未见过,常常因为描述不当而失分,甚至不知所措而放弃答题。笔者根据近年来中考关于该类型试题的考查和化学教学实践和经验,对这类知识和解题方法进行了归纳和总结。一、关于教材中装置气密性的梳理及评价教材中有关装置气密性的检验方法见表1。 Students in the junior high school chemical gas-related experimental questions, the device needs to check the airtight, due to different instrumentation devices, and some devices have never seen the device, often because of improper description of the points, or even Overwhelmed and give up the answer. According to the test in recent years in the examination on the type of test and chemistry teaching practice and experience, this type of knowledge and problem-solving methods were summarized and summarized. First, on the teaching materials in the airtight carding and evaluation of teaching materials in the test method of airtightness in Table 1.