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迁移应 The laboratory method of O_2, CO_2 and other gases in junior high school chemistry is not only the key content of the knowledge of elemental compounds, but also an important part of scientific inquiry. It can comprehensively examine the students’ ability to analyze problems and solve problems, almost becoming the provinces and cities of the country. The required content of the examination proposition. The examination proposition is generally based on the preparation of O_2, CO_2, and other gases and the migration should be