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(一)试制动机在中等专业学校中,学生学习定性分析最感困难的就是对于分析反应后所产生的沉淀或溶液的颜色难于记忆,即使在课堂上讲述后再通过实验操作,也不能完全弥补上述困难,为此,我考虑到如果在课堂讲述过程中,就给同学一个鲜明的直观教具,来加强对学生大脑皮质的刺激而加深记忆,这样对教学效果必有所改善,而目前一般教学上所用教具,往往仅限于表格(我亦用过),但效果不大,由于上述情况,我就开始摸索制作这个教具,并将制作方法介绍给同志们供作参考.
(A) trial motivation In secondary vocational schools, the most difficult for students to learn the qualitative analysis is the analysis of the resulting precipitation or solution of the color is difficult to remember, even in the classroom after the experiment and then through the operation, can not fully make up The above difficulties, therefore, I consider that if teaching in the classroom, give students a clear and intuitive teaching aids, to enhance the stimulation of students’ cerebral cortex and deepen the memory, so the teaching effectiveness will be improved, but the current general teaching The teaching aids we use are often limited to forms (I have also used them), but they are ineffective. As a result of the above, I started to explore the teaching aids and introduced the methods of production to the comrades for reference.