They want to get as far away from each other possible, the ideal angle is 120. But what we have here is a four-membered ring, so what angle does 90° that have to be, that bond? 90 degrees.

它们想要尽量远离彼此，最理想的是形成120°键角,但现在是个四元环,所以这键角应该多大？

麻省理工公开课 - 化学原理课程节选

This is the easiest question all day, what is the bond angle between all of these?

这个问题很简单，键角是多少？

麻省理工公开课 - 化学原理课程节选

So what we're predicting is a bond angle of 90 degrees.

垂直的轨道上。

麻省理工公开课 - 化学原理课程节选

So, in a settling, what is the bond angle here?

这里的键角是多少？

麻省理工公开课 - 化学原理课程节选

What do you know the bond angle should be?

你们觉得键角是多少？

麻省理工公开课 - 化学原理课程节选

Ok So, according to this model, 90° what we're seeing is a bond angle of 90 degrees.

我听到不同的答案，OK，，I，hear，a，mix。,根据这个模型，我们看到键角是。

麻省理工公开课 - 化学原理课程节选

So if we do this and we form the molecule ammonia, let's switch to a clicker question, and have you tell me what the bond angle - is going to be in ammonia -- HNH Actually, let me draw it on the board as you look -- actually, can you put the class notes on, since you don't actually have your notes to refer to.

如果这样做的话，我们就可以形成氨分子，让我们来做一个课堂练习,你们告诉我氨分子中的键角是多少-,键角，the，h，n，h，bond，angle。,实际上让我在黑板上画出它来，这样你们可以看到实际上-,你能把课堂讲义放出来吗，因为你们没有讲义可以参考。

麻省理工公开课 - 化学原理课程节选