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Although we have looked at all levels of the brainstem, the major problems are here."
VOA: standard.2010.02.08
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So, all you will have the opportunity to solve differential equations in your math courses here. We won't do it in this chemistry course. In later chemistry courses, you'll also get to solve differential equations.
你们在数学课中有机会,遇到解微分方程,我们在这化学课里就不解了,在今后的化学课程里，你们也会遇到解微分方程的时候。
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This is the last question we'll see in class on the photoelectric effect, so hopefully we can have a very high success rate here to show we are all ready to move on with our lives here.
这是这个课上最后一个关于,光电效应的问题，所以希望,你们能有个高的通过率,来证明我们已经可以继续往下走。
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So all I'm really interested in here is the idea that we have a duple meter.
我所真正感兴趣的是,我们已经理解了二拍子
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Do we have an open admissions policy ? for all who want to come here?
我们是执行开放式入学政策,让所有想要来的人都能来吗？
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All right. We have them here and they'll be passed around.
我这里还有，现在传下去了。
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Notice at the bottom right here, we have all these different icons.
注意右下方有，一些不同的按钮。
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As we've seen,all the views here have their difficulties.
我们都看到了，所有的观点都会遇到难点。
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In fact, the outcome here, this equilibrium here is for all intents and purposes, the same equilibrium we would have had had there been thousands of firms in the market And had this been a perfectly competitive market.
实际上,这个结果,这个均衡适用于所有的目的和意图,我们将得到同样的均衡,即使市场上有数千的公司,即使这是个完全竞争市场
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Then after we're done with the experiment, we'll have transferred all of the gas from one p2 side to the other. p1 here. p2 sitting here.
我们使所有的气体，从这边到达另一边,这里是P1，这里是。
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So that is relevant for all of these atoms here, so we actually have several different possibilities.
相关的原子都在这里，实际上，我们有几种可能的选择。
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All right. So we can switch back actually to our notes here -- oh, do we have--?
好的，所以我们可以转回到讲义,哦，我们，？
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How many bonding electrons does c l have? All right. Let's see, we've got a mixed response here, it turns out it has two bonding electrons.
氯有多少成键电子？好，让我们来看看，大家的回答不太一致，结果应该是两个成键电子。
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Can I have a teachnic assistance to--to All right.We'll go back here to try this.
有人能提供技术支援吗,好的,我会再尝试一遍
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And finally we have Planck's constant here, which we're all familiar with.
最后这个是我们，都很熟悉的普朗克常数。
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If we look at our last structure here where we have nitrogen the middle, we can also figure out all those formal charges, and in this case we have plus 1 on the nitrogen, we have minus 2 on the carbon, and then we end up with a 0 on the sulfur there.
如果我们来看看最后一个结构,在中间的原子是氮，我们同样可以计算出所有的形式电荷，而在这种情况下，氮为正一，碳为负二，而最后硫为零。
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So we can have our two hydrogen atoms come in here, and what we will find is - now that we have all of our orbitals filled up -- so thinking about what this angle is here, would you expect it to be less than or greater than what we saw for ammonia before?
我们在这里有两个氢原子，我们会发现,现在我们所有的轨道都填满了-,考虑一下这里的角度，你们觉得它比在氨中看到的,要大还是要小？
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So, in terms of finishing our Lewis structure, we're actually not done yet here, even though we have full octets, and we've used up all of our valence electrons, and the reason is because it's c n minus, so we need to make sure that that's reflected in our Lewis structure, so let's put it in brackets here, and put a minus 1.
那么，根据我们的路易斯结构的完成情况，我们实际上还没有全部完成，尽管我们有了填满的“八隅体“,而且用完了所有的价电子，原因就是因为这是一个负离子，我们需要确保我们的路易斯结构能反映出这一点，所以让我们给它加个括号，再加个负一。
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And the dialogue ends with one of the great moving death scenes in western civilization and as Plato says-- let's get the quote here exactly right-- "Of all those we have known, he was the best and also the wisest and the most upright."
然后对话以一个,西方文明史上最伟大感人的死亡场景结束,用柏拉图的话说,让我们引用的更准确些,在我们所知的所有人中,他是最好,最有智慧,最正直的人
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So, let's go ahead and define our variables here, they should be familiar to us. We have the mass, first of all, me m is equal to m e, so that's the electron mass.
让我们继续定义这些常数,我们对这些应该都很熟悉了，首先，我们有质量，m等于。
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That's why it's all in French, because it's not copyrighted, and we have to be careful with that in here with these camera rolling--cameras rolling.
都是法文,因为没有相关版权,而且我们必须得特别小心,何况我们还在录像
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But yeah we're all excited to have you here and we have all sorts of things planned outside of problem sets and we have the Fair and everything that David has been talking about so we're really excited to start so.
我很高兴大家能来到这儿,除了习题集外我们还会遇到各种各样的问题,还有刚才David说过的,研讨会和其他东西,这门课开始了，我们真的觉得很高兴。
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So, here we have the area of the nuclei we'll figure out adding those all together versus the space of all of the atoms put together.
有原子核的面积,通过除以所有原子的,总面积。
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But, of course, we want to go all the way to distance, so we take the second derivative and we have this equation for force here.
当然我们最后想要的是距离,所以我们取二阶微,分就有这个式子。
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All right, so let's count how many we have here.
能不能帮我。
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Everybody's got the sheet there and what I would like to do is just have everyone, all of this--We'll just sing "La" Here. We won't sing the text.
每个人都有一张,我想做的就是让每个人,大家只唱,啦,不用唱歌词
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What the whole note is, what all these symbols are are simply representations of duration so we have a symbolic language here that's going to represent the horizontal axis the axis of duration.
什么是全音符,这些符号又都是什么呢,这些就是简单代表了持续时间,因此我们这里有一套符号语言,来代表横轴,就是时值的那条轴
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Remember, because that 1 s orbital is all the way down in terms of if we're thinking about an energy diagram, we're all the way down here, so we have a huge amount of energy we have to put into the system in order to eject an electron.
还记得吧，因为1，s，轨道在能量示意图里,是在最底部的，我们要一直到最下面，所以我们要向这个系统注入非常大的能量,才能打出一个电子。
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du/dV under constant temperature was equal to zero for an ideal gas. And by analogy, we expect the same thing to be true here, because enthalpy and energy have all this analogy going on here. So let's look at an ideal gas.
偏U偏V在恒温下等于零,可以类比，我们希望在这里也一样，因为焓和能量有很强的类比性，让我们看看理想气体,【理想气体】
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All right, so what we see here is we have our sigma bond that's along the internuclear axis here, but we also have a pi bond, because each of these atoms now has electrons in it's in a p orbital, so we're going to overlap of electron density above and below the bond.
这里我们看到sigma键,是沿着核间轴的，但我们还有一个π键，因为每个原子的p轨道上,都有电子，所以电子密度在键的上面,和下面都有电子密度交叠。
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