00:01
So we have a chemical reaction that we're looking at on the molecular level.
00:05
We want to know something about the change in enthalpy and entropy of this system.
00:12
Now, if you take a look, you can see all of the particular bonds in this process.
00:17
We know to break bonds that requires energy or has a positive enthalpy.
00:23
And to form bonds, we release energy or has a negative enthalpy.
00:28
So in this particular case, you can see that.
00:30
That we have blue atoms and red atoms.
00:34
And to affect this entire chemical reaction, what we have to do is break the bonds and then reform those bonds.
00:42
So if we take a look at this particular process, there are five, i'll call them blue blue bonds that have to be broken, for instance, this one here.
01:00
And we also have on these molecules four, blue red bonds that have to be broken, for instance, this one here.
01:11
But if we take a look at the entire schematic, there are a total of 20 red, blue bonds that have to be broken.
01:22
That is going to require energy, or we're going to have a positive enthalpy for that.
01:30
When we come over to the other side, when we have to put these back together, what we can see in these in each case is that we had to form this blue red bond.
01:43
Now, if we take a look, we have a total of 10 of these molecules, and each of them have two of these blue red bonds.
01:54
So we've made 20 of these red blue bonds...