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教学上的直观性原则是很重要的,一年来在教学上我们重视了这一问题,而且通过本组同志的共同努力,克服了在实验中所遇到的困难,完成了实验工作。现在我们提出几个克服困难的办法来,供中学教师同志们参考。 1.固体物质反应与溶液反应速度的比较:我们用硝酸银和碘化钾。因为固体硝酸银和碘化钾放在一起不易作用。在乳缽中研磨可得黄色碘化银;若将两种固体分别溶于水中,并将其溶液混合,反应立刻完成而得同样的黄色碘化银。这三个步骤很
The principle of intuitive teaching is very important. In the past year, we have attached importance to this issue in teaching. Through the joint efforts of our group, we have overcome the difficulties encountered in the experiment and completed the experimental work. Now we propose several ways to overcome the difficulties for the reference of secondary school teachers. 1. Solid material reaction and solution reaction speed comparison: We use silver nitrate and potassium iodide. Because solid silver nitrate and potassium iodide together is not easy to function. Grinding in a mortar yields yellow silver iodide; if both solids are separately dissolved in water and the solution is mixed, the reaction is completed immediately to give the same yellow silver iodide. These three steps are