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近年来各省市中考化学试题中,源于课本、高于课本的题目逐年增加,这些题目,能够较全面地考查学生基础知识和基本技能,同时对化学教学有良好的导向作用。在初中化学总复习中,如能立足于课本,深挖教材习题的发散因素,充分发挥教材的自身价值,调动学生积极思考,往往会有许多意想不到的收获。 1.通过对课本习题的拓宽引申,把相关知识串联起来,引导学生做到举一反三、触类旁通 例1 利用H_2还原灼热氧化铜实验测定水的组成(如下图),得到下列结果:
In recent years, in provincial and municipal middle school entrance examinations, questions that originate from textbooks and textbooks have increased year by year. These topics can comprehensively examine students’ basic knowledge and basic skills, and they also have a good guiding role in chemistry teaching. In the review of junior high school chemistry, if we can base ourselves on textbooks, dig out divergent elements of textbook exercises, give full play to the value of textbooks, and motivate students to think positively, there are often many unexpected gains. 1. Through the broadening and extension of the textbook exercises, the related knowledge is connected in series to guide the students to do the same by analogy. Example 1 Using H2 to reduce the burning copper oxide experiment to determine the composition of water (as shown below), the following results are obtained: