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投影仪具有操作简便,机动性强,易于普及等特点。在化学实验教学中,充分利用投影仪,能够收到良好的教学效果,本文就投影仪在化学演示实验和培养学生实验技能两方面的应用,谈一点体会。一、利用投影仪,可以提高实验现象的可见度,便于观察,富有较强的启发性。一般投影仪,可将原实验现象放大十五至二十倍,避免了常规演示实验中,某些实验为仪器和药品的用量所限而造成的可见度低的现象,利于观察实验中一些不易观察到的现象,使学生较能清楚地看到化学变化的全过程,实验效果显著提高。例如,原电池的教学中,教师演示此实验时,多数将烧杯连同大电表放在托盘上,一一送到学生面
The projector has features such as easy operation, strong mobility, and easy popularization. In chemistry experiment teaching, full use of the projector, can receive good teaching results, this article on the projector in the chemical demonstration experiment and training students experimental skills in two aspects of application, talk a little experience. First, the use of projectors, can increase the visibility of experimental phenomena, easy to observe, rich and inspiring. General projectors can amplify the original experimental phenomenon by fifteen to twenty times, avoiding the phenomenon of low visibility caused by the limited use of instruments and drugs in routine demonstration experiments, which is conducive to observing some difficult observations in experiments. The arrival of the phenomenon enables students to clearly see the whole process of chemical change, and the effect of the experiment is significantly improved. For example, in the teaching of galvanic cells, when the teacher demonstrates this experiment, most of the beakers and large electric meters are placed on the tray and sent to the students.