00:01
Hello, so today we're going to be talking about mechanisms, elementary steps, and molecularity.
00:09
So basically, a mechanism is an explanation of how a reaction takes place, and it basically outlines all of the elementary steps.
00:23
So say we have a reaction where a becomes d, but a doesn't turn a, into d automatically.
00:35
First, it turns into b and then b turns into c and then c turns into d.
00:48
So a mechanism would be the combination of all of these steps showing how a becomes d.
00:57
And each one of these is called an elementary.
01:02
So in an elementary step, it's basically, it shows what molecules are colliding or if it's just one molecule, what molecule is decomposing.
01:16
And it just shows there's no intermediates, there's no steps in the elementary step, there's one transition state, all that.
01:27
So each one of these would be one elementary steps.
01:31
So this mechanism has three elementary steps.
01:37
So what is molecularity? well, in the three examples i just showed you, in each of these steps, we only have one molecule.
01:49
So it's unimolecular.
01:53
Molecularity is just basically how many molecules are reacting in a step...