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随着科学技术的发展,现行化学教材的知识深广度和难度增大了。如何办?下面谈谈自己在教学实践中的做法和体会。 例如,高中化学第二册82页上有这样一段内容:“不同络离子的电离程度的大小不同。一般说来,配位体是CN~-的络离子的电离程度总是很小。人们利用含氰络离子的电离度很小,即溶液里跟络离子达到平衡的金属离子浓度很小的特点,在电镀工艺中控制金属离子结合电子的速度,从而保证电镀的质量。所以在电镀工业里配制电解液时常使用氰化物作络合剂。但
With the development of science and technology, the depth and difficulty of the knowledge of current chemistry textbooks has increased. How to do? Here to talk about their own practice and experience in teaching practice. For example, on the 82nd page of High School Chemistry Book II, there is a paragraph saying, “The ionization degree of different complex ions is different. Generally speaking, the ionization degree of the complex ion of the ligand CN is always small. The ionization degree of the cyanide-containing complex ion is very small, that is, the concentration of the metal ion in the solution with which the colliding ions reach the equilibrium is small, and the speed of the metal ions combined with the electrons is controlled in the electroplating process so as to ensure the quality of electroplating. Cyanide is often used as a complexing agent when preparing electrolytes.