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分子极性是一个抽象的问题,将分子极性进行实验演示,不但有利于激发学生学习和研究的兴趣,而且能让学生形象地认识到分子极性的存在。一、已有实验分析对于分子极性问题,比较经典的实验有两类:一类是用摩擦生电的玻璃棒或者塑料棒去吸引四氯化碳和水滴。刘积福对该实验进行了分析和改进。苏教版教材中的操作是:在培养皿中加入少量四氯化碳,滴1滴水(也可滴1滴加过红墨水的水)于培养皿中,将摩擦带电的玻璃棒或塑料棒接近水滴,观察水滴
Molecular polarity is an abstract issue. The experimental demonstration of molecular polarity not only helps to stimulate students’ interest in learning and research, but also enables students to vividly recognize the existence of molecular polarity. First, there are experimental analysis For the problem of molecular polarity, there are two types of more classic experiments: one is to use friction glassy or plastic rods to attract carbon tetrachloride and water droplets. Liu Jifu on the experiment were analyzed and improved. Su teach version of textbooks in the operation is: adding a small amount of carbon tetrachloride in the Petri dish, dropping 1 drop of water (you can also drop a drop of red ink over the water) in the Petri dish, the friction charged glass rod or plastic rod Close to water droplets, observe the water droplets