00:01
All right, so which way will the reactions equilibrium be shifted if we make some changes to what's going on in our reaction? this is based on the chalelye's principle, which says when you stress a system at equilibrium, when you do something to it, it will try to get back to equilibrium by doing the opposite of what you did.
00:24
So what do i mean by that? let's take a look at some examples.
00:28
So let's say that you decide that you're going to add some n2o to this reaction.
00:39
Well, in response, the reaction wants to get back to equilibrium.
00:42
So it's going to do the opposite.
00:43
It's going to try to remove the n2o that you put in.
00:47
Well, how can it do that? remember equilibrium reactions can move either to the right or to the left.
00:54
And so if we want to get rid of n2o, if we shift to the right, it will be used up.
01:00
To make no.
01:02
So the reaction will have to shift to the right to do that.
01:08
Now what if we look at some other stresses? let's say we remove some no2.
01:16
Well, the reaction's going to want to do the opposite.
01:19
It's going to want to make some of the no2 that you removed.
01:23
How do we do that? well, if we move to the right, it's going to use no2.
01:27
That's not what we want to do.
01:29
We want to make some.
01:30
So if we shift to the left, now the stuff on the left are products.
01:35
We're making that stuff.
01:37
So if we shift to the left, we'll make more no2.
01:45
What if we add some no? well, the reaction will do the opposite.
01:56
It will try to get rid of the no.
01:59
How do we do that? well, if we shift to the right, we're going to make no.
02:02
We don't want to do that.
02:04
So if instead we shift to the left, the no is our reactant and gets used up...