初中化学教材中有关空气的组成、水的净化(过滤、吸附、蒸发、蒸馏等操作)、水的电解、氧气和二氧化碳的制取及性质、木炭还原氧化铜、可燃物的燃烧及燃烧的条件、金属锈蚀的条件、浓硫酸的稀释、酸的性质、碱的性质、p H的测定等实验是初中化学的重点实验内容,它既能考查学生的科学探究能力,又能全面地考查学生分析问题及解决问题的能力,也是近年来全国各省、市中考命题的热 Junior high school chemistry textbook on the composition of the air, water purification (filtration, adsorption, evaporation, distillation and other operations), electrolysis of water, oxygen and carbon dioxide production and nature of the reduction of copper oxide, combustion of combustible and combustion conditions , Metal corrosion conditions, concentrated sulfuric acid dilution, the nature of the acid, the nature of the base, p H determination and other experiments is the focus of junior high school chemistry experiment content, which not only can examine students’ ability of scientific inquiry, but also a comprehensive examination of student analysis Problems and the ability to solve problems, but also in recent years the provinces, municipalities hot topic in the test