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随着新课程改革的不断深入,实验教学显得越来越重要。2003年版全日制普通中学化学教材(必修)第一册中选编了大量的演示实验,这有助于帮助学生理解物质的化学性质,深人了解化学现象的本质,同时还能活跃课堂气氛,节省教学时间。但有些实验的实验现象与理论出入较大或用时较长。如,高一化学第六章第三节硫酸【实验6-5】:在一支试管里加入一小块铜片,然后再加人3 mL浓硫酸,用装有玻璃导管的单孔胶塞塞好,加热。放出的气体分别通人品红溶液(褪色)或紫色石蕊试液(变红)
With the continuous deepening of new curriculum reforms, experimental teaching becomes more and more important. In the 2003 edition of the full-time regular middle school chemistry textbook (required), a large number of demo experiments were selected to help students understand the chemical nature of the substance and to understand the nature of the chemical phenomenon. At the same time, they were able to activate the classroom atmosphere and save Teaching time. However, some experimental experiments and the theory out of the larger or longer. For example, Gaoyi Chemicals Chapter 6 Section 3 Sulfuric Acid [Experiment 6-5]: Add a small piece of copper in a test tube, then add 3 mL of concentrated sulfuric acid, and use a single-hole rubber plug equipped with a glass tube. Plug it in and heat it. The evolved gas passes through the magenta solution (fade) or the purple litmus test solution (red)