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人民教育出版社2015年版的九年级上册初中化学课本117面“二氧化碳的性质”中,实验试剂用量大,操作复杂。特别是灭火实验,由于两支蜡烛在烧杯内燃烧,造成烧杯内的温度升高,倾倒二氧化碳时受到集气瓶内热气流的影响,二氧化碳会向上扩散,实验通常不能成功。对此,笔者进行了以下改进。一、实验目的验证:二氧化碳密度比空气密度大;二氧化碳不能燃烧,也不支持燃烧;二氧化碳跟水反应;二氧化碳跟澄清石
People’s Education Press 2015 edition of the ninth grade on the junior high school chemistry textbook 117 surface “nature of carbon dioxide ”, the experimental reagent dosage, the operation is complicated. In particular, in the fire extinguishing experiment, the two candles burning in the beaker caused the temperature inside the beaker to rise. When the carbon dioxide was poured, it was affected by the hot air flow in the gas-collecting bottle. The carbon dioxide diffused upward and the experiment was usually unsuccessful. In this regard, I made the following improvements. First, the purpose of the experiment Verification: carbon dioxide density than air density; carbon dioxide can not burn, do not support combustion; carbon dioxide with water reaction; carbon dioxide and clear stone