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习题是中学化学教材的一个重要组成部分。学生只有通过解答一定数量的不同类型的习题,才能更好地理解课本中的知识,培养自己的思维能力、记忆能力、表达能力和计算能力,使知识真正成为自己的财富。这次改编本保留了试用本中69道较好的习题,修改了26道,同时新增了135道习题。选编过程中注意了尽可能反映最基本、最重要的基础知识和基本技能。注意了数量适宜,总共编入230道习题,平均每课时2.9道习题。注意了类型的多样化和符合初中化学应培养的化学计算技能的要求,适当降低了有关计算部分的难度。
Exercises are an important part of the middle school chemistry textbook. Only by answering a certain number of different types of exercises can students better understand the knowledge in the textbooks, develop their own thinking ability, memory ability, expressive ability, and computational ability, so that knowledge can truly become their own wealth. This adaptation of the book has retained 69 good exercises in the trial, revised 26 tracks, and added 135 new exercises. During the selection process, attention was paid to reflecting the most basic and important basic knowledge and basic skills as far as possible. Note that the number is appropriate, a total of 230 exercises are included, with an average of 2.9 exercises per class. Attention was paid to the diversification of types and to the requirements of chemical calculation skills that junior high school chemistry should develop, and the difficulty of the relevant calculation part was properly reduced.