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一、本章教材分析 1、新教材(基本要求)与旧教材的比较。新教材(基本要求)与旧教材相比,在理论要求上有所降低,删去了一些难度较大的内容。例如,删去了电离常数及其有关计算,删去了从水的电离常数推导水的离子积常数,删去了水的离子积随温度的变化,删去了弱酸弱碱盐的水解,删去了盐的克当量,删去了原来作为阅读教材(小字排印)的关于等当点的概念以及外加电流的阴极保护法,并把电解食盐水的工业生产改为小字排印的阅读教材等等。可是,新教材比旧教材增添了一部分较具有思考性的习题。例如,在判断物质导电性的习题里增
I. Analysis of textbooks in this chapter 1. Comparison between new textbooks (basic requirements) and old textbooks. Compared with the old textbooks, the new textbooks (basic requirements) have been reduced theoretically, and some difficult content has been deleted. For example, the ionization constants and related calculations have been deleted, the ion product constants for water are derived from the ionization constant of water, the ion product of water is changed with temperature, and the hydrolysis of weak acid and weak base salts is deleted. The gram equivalent of salt was removed, the concept of equal points as well as the cathodic protection method of impressed currents, which was originally used as a teaching material (printed in small print), was deleted, and the industrial production of electrolyzed salt water was changed to small-size typographic reading materials, etc. . However, the new textbook adds some more thought-provoking exercises than the old textbooks. For example, in the exercise of determining the conductivity of a material