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I'm going to write it like this three moles of hydrogen which is a gas one bar 100 degrees Celsius.
我会写成这样：,三摩尔氢分子，气体,1巴，100摄氏度。
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So what we can actually directly compare is the dissociation energy or the bond strength of nitrogen versus hydrogen.
因此实际上我们可以直接进行比较,对氮分子与氢分子的离解能,或键的强度。
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I'm not going to writegiven threemoles of hydrogen at one bar and three degrees, blah,bla I'm going to write it in a compact notation.
我不会写“给定1巴和多少度下,的三摩尔氢分子之类,我会把它写成一个紧凑的形式。
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If I look at a homonuclear molecule such as molecular hydrogen, this is perfect sharing.
如果我用这个测量表测氢分子,完全平均共价的分子。
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If God gathers up all those small molecules, that had composed my body, reassembles them in the right order and put these calci molecules next to that hydrogen molecules, so forth and so on, reassembles them in a right way.
如果上帝重组了所有构成我肉体的，微粒分子，将它们以正确的次序重组,把大量的钙生分子和,氢分子放在一起，组合起来，将它们以对的次序重组。
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In contrast, the dissociation energy of a bond for hydrogen, and molecular hydrogen is everywhere around us, we see 432 kilojoules per mole.
相反，氢分子在我们周围到处都是，一个氢分子的离解能，是432千焦每摩尔。
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So, for example, hydrogen or fluorine they'll never be in the middle, they'll always be on the end of a molecule.
比如，氢或者氟,永远不会在中间，它们总是会在分子中最边缘的位置。
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So let's draw the electron configuration of hydrogen, the molecule, molecular hydrogen.
让我们来画氢原子的,电子构型，分子，氢分子。
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So what that means is that's how much energy we would have to put into a hydrogen molecule in order to get it to split apart into its two atoms.
它的意义,就是我们需要向一个氢分子中注入这么大的能量,才能将它分解成两个独立的原子。
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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。
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If we know that this is it the dissociation energy for a hydrogen atom, we can also say the bond strength for hydrogen molecule 424 is 424.
如果我们知道了这是一个氢分子的离解能,那么我们也可以说氢分子的键的强度,就是。
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And so we can actually think about how do we calculate what the dissociation energy should be for h 2, so let's go ahead and do this.
因此，我们其实可以想到应该如何计算,氢分子的离解能，那么我们开始做一下吧。
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So, what this lets us do now is directly compare, for example, the strength of a bond in terms of a hydrogen atom and hydrogen molecule, compared to any kind of molecule that we want to graph on top of it.
因此，这让我们现在可以做到直接进行比较，比如，将一个氢原子，和一个氢分子的键的强度，与任何其它类型的分子进行比较,我们只需要把它的曲线也画在这幅图上。
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So, if we talk about dissociating h 2, we're going from the h 2 molecule, and breaking this bond right in half, so we now have two individual hydrogen atoms here.
那么，如果我们讨论的是离解氢分子，我们将从氢分子开始，使这个键断裂，一分为二，那么就得到了两个分开的氢原子。
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You do not get this line from molecular hydrogen.
从氢分子中我们得不到这种光线。
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So, let's compare this to the energy of the h 2 molecule, and we find that that's negative 3,048 kilojoules per mole.
那么，让我们将它与氢分子的能量比一比，我们发现氢分子的能量是负的，3048，千焦每摩尔。
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So, in talking about covalent bonds, we should be able to still apply a more general definition of a chemical bond, which should tell us that the h 2 molecule is going to be lower in energy than if we looked at 2 separate hydrogen atom molecules.
那么，既然提到了共价键，我们应该还可以,给化学键下一个更普遍的定义,那就是告诉我们氢分子能量应该更低,与两个分开的氢的单原子分子相比。
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So, let's change our graph where we now have this zero point set as the two individuals hydrogen atoms, and then we see that our h 2 molecule is at the negative of the dissociation energy, or the negative what that bond strength is.
那么让我们把曲线图中的零点能改到,两个分离的氢原子处，那我们就会看到,氢分子就是负的离解能，或者负的键的强度。
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So our simplest case that we started talking about was molecular hydrogen.
最简单的例子,就是氢分子。
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Yeah, we'd expect to see a single bond in hydrogen.
嗯，我们预计在氢分子里会看到一个单键。
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And then even lower down, we have our bonded hydrogen molecule.
然后继续降低，我们就有了通过共价键结合的氢分子。
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And now I have to fill this molecular hydrogen.
现在我填充了分子氢。
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What is the energy change going from two atomic hydrogens to one H2?
什么是能量的改变,从两个原子氢到H2分子？
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