论文部分内容阅读
初中化学演示实验的成功与否,直接关系到课堂教学效果的好坏。一个成功的实验,能使学者兴趣盎然,教者情绪轻松,自然就形成了教师与学生之间一股强烈的心灵沟通与融汇,起到事半功倍的作用。为了提高课堂演示实验的成功率,笔者对多处实验进行了改进,现将其中几处分述如下: 一、蒸发硫酸锌溶液 按教材给定方法操作的话,由于(1)耗时长,(2)蒸发后的固体因含杂质而带灰色或黑色,使学生易产生错觉。
The success of junior high school chemistry demonstration experiment is directly related to the effect of classroom teaching. A successful experiment can enable scholars to have a wide range of interests and teachers’ emotional ease. Naturally, they form a strong spiritual communication and integration between teachers and students, playing a multiplier role. In order to improve the success rate of classroom demonstration experiments, the author has improved a number of experiments. Several of them are now described as follows: 1. Evaporation of zinc sulfate solution should be performed according to the given method of teaching materials. (1) It takes a long time, (2) Evaporated solids are gray or black due to impurities, making students susceptible to illusions.