初中化学中O_2、CO_2等气体的实验室制法既是元素化合物知识的重点内容,又是科学探究的重要组成部分,它能全面地考查学生分析问题及解决问题的能力,几乎成为全国各省、市中考命题的必选内容。中考命题一般以O_2、CO_2等气体的制取实验及 Junior high school chemistry O_2, CO_2 and other gases laboratory preparation method is not only the focus of knowledge of elemental compounds, but also an important part of scientific inquiry, it can comprehensively examine the ability of students to analyze and solve problems, almost become the provinces, cities The necessary content of the entrance examination proposition. In the senior high school entrance examination proposition to O 2, CO 2 and other gases from the experiment and preparation