| plot ...plot ...plot ...please |
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sara_abri
Probably a bot.
Joined: 24 Oct 2005
Posts: 1
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 Posted: Mon Oct 24, 2005 9:09 am Post subject: plot ...plot ...plot ...please |
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can u help me on this please ...???!!! 
Make an accurate plot of FA versus r for an Mg2+ - O2- pair. Conceder the range of r from 0.2 to 0.7 nm.
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RobJim
Senior Member
Joined: 13 Feb 2005
Posts: 320
Location: Los Angeles, CA
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| Posted: Wed Nov 02, 2005 6:19 am Post subject: |
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| What is FA?
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charco
Regular
Joined: 07 Mar 2005
Posts: 96
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| Posted: Thu Nov 03, 2005 12:01 am Post subject: |
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It could be nothing at all 
but then again it could be the force of attraction
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RobJim
Senior Member
Joined: 13 Feb 2005
Posts: 320
Location: Los Angeles, CA
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| Posted: Thu Nov 03, 2005 9:34 am Post subject: |
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Oh, I see. You'll need Coulomb's Law then.
http://en.wikipedia.org/wiki/Coulomb%27s_law
q1 and q2 are the absolute values of the charges of the ions - in both cases, 2 fundamental units (with one fundamental unit being 1.602 × 10^−19 coulomb). This will give you an equation of the form of
F = c/r
with c being a constant equal to kq1q2.
This sort of graph should look something like the first one on this page:
http://id.mind.net/~zona/mmts/functionInstitute/rationalFunctions/oneOverX/oneOverX.html
F would be the vertical, or y, axis, while r would be the horizontal axis. Of course r goes from one positive value to another so you will only show part of the positive part of the graph.
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