-
"Of course,you have the Palestinian-Israeli situation, plus the Saudi-Yemen problem, plus all kinds of bilateral issues, wars or bilateral conflicts, let us say,which could really lead into war in the future."
VOA: standard.2009.11.15
-
So we can do this for any final charge we have, if we have a molecule that has a charge of plus 2, then all of the formal charges should add up to plus 2 and so on.
对于任意净电荷的情况,我们都可以这样做，比如假设我们有一个带两个正电荷的分子，那么所有的形式电荷加起来应该等于正二，等等。
-
We do in fact--I do have conversations with all 30 plus of the teaching fellows about all 300 plus of the students at the end of the semester, and that is in the end what determines the outcome.
事实上，我们----在这个学期末,为了了解这300多个同学的情况,我会和30多个助教谈话，这最终帮助决定成绩。
-
1 So, it's two times 3.12 plus four times 1.31, 6 all divided by six.
就是2*3。12+4*1。,最后再除以。
-
sb So just to say that it's 1 s squared plus 1 s b, all of that together squared.
这就是说它是1sa加上，这整个的平方。
-
After all, if the person is the combination, if the person is the pair, soul plus the body, destroy the body, you've destroyed the pair.
毕竟,如果人是组合体,如果一个人是一对儿组合,灵魂加肉体,那么毁掉肉身,你就已经摧毁了这一对儿
-
pV=RT p plus a over v bar squared times v bar minus b equals r t. All right if you take a equal to zero, these are the two parameters, a and b. If you take those two equal to zero you have p v is equal to r t.
我们就回到,也就是理想气体,状态方程,下面我们来看看,这个方程。
-
k * n m plus k all times log n is in general going to be much better than k times n.
在普遍情况下要远远好于,实际情况要取决于n和k的取值。
-
We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.
我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1
-
But, it will be plus, all right? But, it will be plus.
但是，会是正，对吧？，但是这件会正。
-
One minus one-half plus one-third, it is all there.
-1/2+1/3，这就是它。
-
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。
-
Plus, there's all kinds of trash left around.
而且，还会给周边带来很多的垃圾。
-
w And that has to equal q plus w, summed up for all the steps.
等于q加，对所有过程相加。
-
So if we have total +2 and complete shielding -1 where that can actually negate a full positive charge, because remember our nucleus is plus 2, +1 one of the electrons is minus 1, so if it totally blocks it, all we would have left from the nucleus is an effective charge of plus 1.
抵消一个完全的正电荷,因为记住我们的原子核是,其中一个电子是,所以如果它完全挡住了它，我们从原子核中留下的，全部有效电荷就是，所以，在我们的第一个例子中,我们的第一种极端情况。
-
We all do believe something makes it true that two plus one equals three, but it's not the fact that empirical objects-- We don't do empirical experiments to see whether two plus one equals three.
我们都相信有些东西,使2加1等于3是正确的,但这不是说现实的东西,我们不会在现实中做实验,去看看二加一是不是等于三
-
It's always a good first approximation, because you need to start somewhere in terms of drawing Lewis structures, but then if you go and figure out the formal charge and you just have lots of charge separation or very high charges, like a plus 2 and a minus 2 and a minus 1 all different places in the atom, what it should tell you is maybe there's a better structure.
它总是一个好的第一近似，因为在画路易斯结构的时候,你总需要一个起点，但是如果你在算出形式电荷之后,发现有很多电荷分开了,或者说有很高的电荷，比如有一个正二，一个负二，还有一个负一1,在原子的各个地方，这应该就是在告诉你,或许还有一个更好的路易斯结构。
-
u=q+w All right, what is delta u? delta u is q plus w.
好，Δu是多少？Δ
-
First of all, this is the two s orbitals in hydrogen, 1s plus 1s smearing to give us this sigma molecular orbital.
首先，这是氢气中的两个s轨道，1s与1s轨道重叠,产生sigma分子轨道。
-
And again, if we write out what all the terms are, we again have 1 s a squared plus 1 s b squared, but now what we're doing is we're actually subtracting the interference term.
同样，如果我们把所有的项都写出来，同样我们有1s平方加上1sb平方，先现在我们做的是,我们要减去干涉项。
应用推荐