分子极性的判断是高考考查的热点问题,虽然分数占的不多,但是现在的高考化学一共才108分,这个知识点也是我们不容放过的.对于判断方法我们可以从一下几个方法中挑选一个适合自己的方法.一、分析及利用结构判断1.据共价键的极性判断共价键是否有极性是分子是否极性的前提条件.如果分子中不存在极性键,该分子一定不是极性分子;对于双原子分子来说,键的极性与分子的极性是一致的.2.几何对称法 The judgment of molecular polarity is a hot issue in college entrance examination examination, although the scores account for not much, but now the college entrance examination of chemistry a total of only 108 points, this knowledge is that we can not let off .For the judgment method we can look at a few ways Select a suitable method .A analysis and use of structural judgment According to the polarity of the covalent bond to determine whether the polarity of the covalent bond is the polarity of the molecule if the prerequisite .If there is no polar bond in the molecule, the The molecule must not be a polar molecule; for a diatomic molecule, the polarity of the bond is the same as the polarity of the molecule.2.Geometry Symmetry