Frequency factor A


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Ashley McClearnen 1B
Posts: 59
Joined: Fri Sep 28, 2018 12:26 am

Frequency factor A

Postby Ashley McClearnen 1B » Mon Mar 11, 2019 2:14 pm

Can someone please explain what the frequency factor, A, is and what it tells us.

Katelyn Pham 4E
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am

Re: Frequency factor A

Postby Katelyn Pham 4E » Mon Mar 11, 2019 2:54 pm

In the book it says "A is a measure of the rate at which molecules collide" and this rate refers to the frequency of molecules colliding.

Rogelio Bazan 1D
Posts: 64
Joined: Tue Nov 14, 2017 3:01 am

Re: Frequency factor A

Postby Rogelio Bazan 1D » Mon Mar 11, 2019 2:57 pm

Since Dr. Llavelle went over this at the end of the lecture I did not get great notes on it, but what I did get was that 'When they collide, it is Frequency Factor A'. So I assume that Frequency A is in reference to the rate at which the molecules collide. Hope this helps.

shouse1f
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: Frequency factor A

Postby shouse1f » Mon Mar 11, 2019 5:31 pm

in lecture today it was explained that frequency factor, A, has to do with reactants must have correct orientation when they collide. Dr. Lavelle also mentioned when A increases k decreases

Max Hayama 4K
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

Re: Frequency factor A

Postby Max Hayama 4K » Mon Mar 11, 2019 6:49 pm

I believe Professor Lavelle mentioned that the frequency factor is the percent of successful collisions. So if 10% of collisions are successful based off orientation, the frequency factor, A, will be .10.

Ray Guo 4C
Posts: 90
Joined: Fri Sep 28, 2018 12:15 am

Re: Frequency factor A

Postby Ray Guo 4C » Mon Mar 11, 2019 7:06 pm

In the book, A is just called the pre-exponential factor. I think it will become clearer in the next lecture as we get into collision theory. Then you see what constants are included in A.
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Rate Constant.png

LorenzoDuvergne3I
Posts: 60
Joined: Fri Sep 28, 2018 12:25 am

Re: Frequency factor A

Postby LorenzoDuvergne3I » Mon Mar 11, 2019 7:13 pm

Were any of the other terms mentioned in lecture today?

sophiebillings1E
Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

Re: Frequency factor A

Postby sophiebillings1E » Mon Mar 11, 2019 7:26 pm

I'm pretty sure its the percent of successful collisions.


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