## Molecularity

$K = \frac{k_{forward}}{k_{reverse}}$

Cecilia Jardon 1I
Posts: 74
Joined: Fri Sep 28, 2018 12:16 am

### Molecularity

In lecture, Lavelle mentioned how unimolecularity exists in an A--> P reaction. I was not able to catch when he said how does one reactant collide with itself. Can someone explain please.

Aarti K Jain 1L
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

### Re: Molecularity

A unimolecular reaction isn't about collision, but more about a rearrangement of the molecule. For example, decomposition or radioactive decay can occur of a single molecule without any collisions occurring simply because the molecule is breaking apart/rearranging itself into multiple molecules.

mahika_nayak_3L
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

### Re: Molecularity

Molecularity refers to the number of species in an elementary step. In a unimolecular reaction, there is only one species in the elementary step. The reaction can be unimolecular if there is a rearrangement of a single molecule that produces product.

Lisa Werner 2F
Posts: 72
Joined: Fri Sep 28, 2018 12:17 am

### Re: Molecularity

molecularity is based upon the number of types of reactant molecules in a reaction