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Author Topic: Particle Speed Formula  (Read 6855 times)

Offline CsManiacDan

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Particle Speed Formula
« on: 29/02/2004 20:11:12 »
Does anyone know about a formula that can be used to work out the speed of particles in a given reaction? I recently asked my Chemistry teacher this and she said their probably was one but didn't know of it.

Thanks

I Love Caesium!!!


 

Offline nilmot

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Re: Particle Speed Formula
« Reply #1 on: 01/03/2004 10:56:37 »
Mmm..sorry that I don't know the formula to calculate particles speed but I'm interested to know without sounding nosey but why do you love Caesium?

Tom
 

Offline cuso4

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Re: Particle Speed Formula
« Reply #2 on: 01/03/2004 11:00:53 »
quote:
Originally posted by nilmot

.....why do you love Caesium?

Tom



Probably because it's reaction with water!;) I always enjoy seeing the explosion and the glass breaking (Only saw it on TV though).
As to the particle speed formula, in physics lessons I remember studying a formula which can work out the kinetic energy of a particle just by measuring the temperature. I'll dig my notes out, this might be what you want.

Angel
« Last Edit: 01/03/2004 11:05:27 by cuso4 »
 

Offline CsManiacDan

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Re: Particle Speed Formula
« Reply #3 on: 01/03/2004 17:36:18 »
cuso4's got it right! It always annoys me that they never show you the reaction in schools:( I understand why though.

Sounds like what you've got could be what i'm after. Keep looking

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Offline nilmot

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Re: Particle Speed Formula
« Reply #4 on: 02/03/2004 09:40:06 »
In that case I think everyone is school will love Caesium. They love explosion, in our group they asked the teacher to play the reaction at least 5 times

Tom
 

Offline Ylide

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Re: Particle Speed Formula
« Reply #5 on: 03/03/2004 04:42:18 »
I don't know the exact formula either, but I would guess that your could estimate it it out by figuring out the energy of reaction and dividing by the number of product molecules produced in the reaction.  Then use KE=1/2 mv^2 using the mass of the molecule and solve for v.  

That's not entirely accurate as there is going to be some vibrational and rotational components to the energy as well as the translational, so you answer is going to be on the high side.  You'd need some knowledge of physical chem to derive equations to account for those.  If they're gases, the equipartition theorem could work.



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Offline cuso4

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Re: Particle Speed Formula
« Reply #6 on: 04/03/2004 08:40:09 »
I got the formula but I don't think it will work for molecules in a reaction.

The formula I got is pressure = 1/3 x density x mean-squared-speed

This only apply to ideal gas, and also the condition is changing all the time in a reaction so I don't think this can be used.

Angel
 

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Re: Particle Speed Formula
« Reply #6 on: 04/03/2004 08:40:09 »

 

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