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十字交叉法是中学化学计算中重要的技巧之一,它具有适应性强,又能准确、迅速求解的特点。但有些学生对其原理及适用范围不清楚,常出现不应有的错误。本文从原理介绍着手,通过具体题例的应用,以提高学生解题能力。 1 十字交叉法原理 用A、B分别表示二元混合体系中的组分的量,用a、b分别表示对应A、B组分的特性数量,则A+B表示混合体系的总量,用C表示该混合体系的特性数量
Cross method is one of the most important skills in middle school chemistry calculation. It has the characteristics of adaptability, accuracy and prompt solution. However, some students do not know the principle and scope of their application and often make unwarranted mistakes. This article starts with the introduction of the principle, through the application of specific examples to enhance students' ability to solve problems. 1 cross method principle A, B, respectively, said the binary mixed system components, with a, b, respectively, the corresponding A, B component of the number of characteristics, then A + B said the total amount of the mixed system with C indicates the number of characteristics of the mixed system