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我在进行五年制小学自然第八册第六课《氧气》一课教学时,在做铁丝在氧气中燃烧实验时发现:铁丝在空气中燃烧非常缓慢,只能看到烧红的现象。铁丝在氧气中却能剧烈地燃烧,火星四射,发出耀眼的光。 铁丝在氧气中燃烧实验进一步说明了氧气能支持燃烧的性质。而这个实验难度较大,要求较高。怎样使这个实验获得成功呢? 我通过多次实验和反复研究,终于解决了这一实验教学难题。
When I was teaching “Oxygen” in the sixth course of the eighth grade of the fifth grade primary school, I found that when the iron wire was burnt in oxygen, the iron wire burned very slowly in the air and only saw the phenomenon of burning red. Iron wire can burn violently in oxygen, sparking, sparkling light. Experiments in which oxygen is burned in wire further illustrate the oxygen's ability to support combustion. This experiment is more difficult and demanding. How to make this experiment a success? I through many experiments and repeated research, finally solved the experimental teaching problems.