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We can say that a nonpolar molecule you can have as a result of two different conditions.
所以你可以说非极性分子,有两种构成方式。
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The second way to have something that is net nonpolar is to have spatially symmetric disposition of polar bonds.
第二种构成,需要空间非极性,就是需要极性键的空间对称分布。
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Nonpolar molecules result from either, it's one or the other.
一个非极性分子，不是这一种就是那一种。
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Here is the question. Is methane a polar molecule or a nonpolar molecule? Let's look carefully.
问题是，甲烷是一个极性分子还是非极性分子,我们仔细看看。
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2 3 So, that means we've got one, two, three, four nonpolar bonds in here.
我们有，4个非极性的键。
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Symmetric disposition of polar bonds still results in a nonpolar molecule.
空间对称的极性键分布,还是会导致整个分子为非极性分子。
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If we can do that, we'll end up with a symmetric nonpolar molecule.
如果我们能这样做，我们就能得到那些对称非极性的分子。
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We somehow have to take hydrogen, attach it to carbon, and we have to make it symmetric, and we have to make it nonpolar.
我们需要把H接到C周围，而且我们需要让它是对称，且非极性的。
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And yet, the molecule is symmetric and nonpolar.
所以这个分子是对称非极性的。
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What makes something polar versus nonpolar?
是什么让一个分子呈极性或者非极性？
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