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初三化学第三章第三节关于溶解度的计算,是继根据分子式计算及根据化学方程式计算之后又一重要的化学计算.这部分计算是学生首次接触有关溶液的计算,掌握得如何对今后各种有关溶液的计算有一定影响.由于这部分内容只在初中接触一次,到高中不再引深,所以必须一次讲透.但是,本节内容按教材讲授后,同学们普遍感到概念会背,例题也懂,就是不能独立完成教材中及参考资料上难度较大的习题的计算.造成这种情况的原因有两点,一是学生对“溶解度”这一重要概念理解不透,解题时往往将溶剂、溶液混为一谈.二是教材中例题类型太少,不补充例题不能开阔学生思路.
The calculation of the solubility in the third section of the third chapter of chemistry in the third chapter is another important calculation after the calculation according to the formula formula and the equation of chemical formula. This part of the calculation is the first time the student is exposed to the calculation of the solution, and how to grasp the future This kind of solution has a certain influence on the calculation of the solution. Since this part only touches once in junior high school, and it does not lead to deepening in high school, it must be thoroughly explained. However, after the contents of this section were taught according to teaching materials, the students generally felt that the concept would be back. The example also understands that it is impossible to independently complete the computation of difficult exercises in the teaching materials and reference materials. There are two reasons for this situation. First, students understand the important concept of “solubility” and solve problems. Solvents and solutions are often mixed. Second, there are too few examples in the textbooks. No examples can not broaden students’ thinking.