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部编初中化学课本第五章第三节硫酸,我们分两课时讲授。第一课时在学生掌握盐酸性质的基础上,教学稀硫酸性质。第二课时,在学生掌握稀硫酸性质后,通过对比、演示等教学方法让学生知道浓硫酸既与稀硫酸有相同的一些化学性质,又有它独特的化学性质。再依据浓硫酸的特性,向学生强调指出稀释浓硫酸时必须注意的要点。第二节课开始,先提问复习稀硫酸的物理性质和化学性质,并将化学性质逐条边讲边板书。然后提出,稀硫酸是由浓硫酸稀释而来的,那么浓硫酸的性质是否也和稀硫酸完全一致呢?这时,教者展示浓、稀硫酸的样品,让学生观察对比。浓硫酸和稀硫酸都是无色、不易挥发的液体,这是两者相似
Part junior high school chemistry textbook fifth chapter third sulfuric acid, we teach in two classes. The first lesson in the students to master the nature of hydrochloric acid, based on the teaching of dilute sulfuric acid. In the second class, after students master the properties of dilute sulfuric acid, through contrast, demonstration and other teaching methods to enable students to know that both concentrated sulfuric acid with dilute sulfuric acid has some of the same chemical properties, but also its unique chemical properties. Then based on the characteristics of concentrated sulfuric acid, to emphasize that the students must pay attention to the points diluted sulfuric acid. The second class begins, first asked to review the physical and chemical properties of dilute sulfuric acid, and the chemical properties of the side by side talk about the sideboard. Then it was proposed that dilute sulfuric acid is diluted by concentrated sulfuric acid, and whether the nature of concentrated sulfuric acid is exactly the same as that of dilute sulfuric acid. At this time, the teacher showed samples of concentrated and dilute sulfuric acid to allow students to observe and contrast. Concentrated sulfuric acid and dilute sulfuric acid are colorless, non-volatile liquid, which is similar to the two