He said that the percent ionic character, and this is within a bond, not for a compound, for a covalent bond.

他提到离子百分数，是指一根键中，并非一个分子中。

麻省理工公开课 - 固态化学导论课程节选

So, there's actually another way to graph it where we can directly graph the dissociation energy or the bond strengths.

其实，还有另外一种画这个曲线的方式,可以直接画出离解能的大小,或者键的强度。

麻省理工公开课 - 化学原理课程节选

So, we know from our calculation that we can do over here, that this bond is polar.

我们通过计算都知道,这个键是非极性的。

麻省理工公开课 - 固态化学导论课程节选

I mean, hypothetically a bond trading at $.60 on the dollar with an 8% coupon, five-year bond that's yielding about 18%.

我的意思是，假设一种债券以0。60美元进行交易,同时有8%的票息，五年期债券收益率在18%左右。

耶鲁公开课 - 金融市场课程节选

So notice a difference in these structures, is this has an n h bond whereas this has an o h bond.

注意它们之间的有一点不同，那就是一个有氮氢键,而另一个有氧氢键。

麻省理工公开课 - 化学原理课程节选

So if we look at its length, it's actually shorter than a single bond, but longer than a double bond.

因此如果我们看它的键长的话，它实际上比单键更短，却比双键更长。

麻省理工公开课 - 化学原理课程节选

so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.

因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。

麻省理工公开课 - 固态化学导论课程节选

The other thing that's happened now is that Warren Buffett said he wants to get into the municipal bond insuring business.

还有一件事,沃伦·巴菲特说,他希望介入市政债券保险这一领域

耶鲁公开课 - 金融市场课程节选

Likewise, the element that is a good electron acceptor in an electron transfer reaction is going to be the element that is going to hog the electrons in a covalent bond.

同样的，这个元素在一个电子转移反应中,是个很好的受赠者它将成为在共价电子,中吸引电子的元素。

麻省理工公开课 - 固态化学导论课程节选

It's also important, once we start talking about molecules, to have a way to represent them, and also to be able to look at a shorthand notation for a certain molecule and understand what the bond is.

还有很重要一点是，一旦我们开始讨论分子，我们需要有一种表示它们的方法，而且能够从中看出,某些分子的简化符号，并得知键的类型。

麻省理工公开课 - 化学原理课程节选

What these do is they insure the bond-- they insure the investor against the municipality failing to pay on the bond.

他们的业务是为市政债券保险,他们确保政府当局,有能力向投资者进行赔付

耶鲁公开课 - 金融市场课程节选

And so both of these lobes together constitute a pi bond.

上下两片叶一起组成了一根π键。

麻省理工公开课 - 固态化学导论课程节选

This is called a dative bond.

这种化学键称为配位键。

麻省理工公开课 - 固态化学导论课程节选

So, for example, down here I wrote that it was n 2 and that it was h 2, but when I re-wrote the molecules up here, you saw that it's an h h single bond where it's a nitrogen-nitrogen triple bond.

比如，在这下面我写的是氮分子2,而这个是氢分子，但我在上面把这些分子的形式改写了，大家可以看到,这是一个氢与氢之间的单键，含一个氮与氮之间的三键。

麻省理工公开课 - 化学原理课程节选

If you get some of these in the upper atmosphere, a photon, an ultraviolet photon, has the energy capable of breaking this bond.

如果你把它放到大气层上，一个光子，一个紫外光光子，有能量可以破坏它的化学键。

麻省理工公开课 - 固态化学导论课程节选

And we know that it's electron density between the nuclei that holds two atoms together in a bond.

我们知道是两个原子核之间的,电子密度保持两个原子在一起成键的。

麻省理工公开课 - 化学原理课程节选

Then minus 1/2 of 2, because we only have one bond or 2 electrons in a bond.

然后减去二的二分之一，因为我们只有一个键，一个键就是两个电子。

麻省理工公开课 - 化学原理课程节选

And ultimately we are going to get to this state where we are going to form a bond.

最终我们将得到这个状态,即形成一根键。

麻省理工公开课 - 固态化学导论课程节选