Bond Strength and Polarizability

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Isaac Wen
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Bond Strength and Polarizability

Postby Isaac Wen » Thu Nov 19, 2020 4:22 pm

Hi!

I'm a little confused about how bond strength relates to polarizability. Namely, if larger atoms have longer bonds and thus weaker bonds, how can they create larger London forces? Or am I confusing intramolecular and intermolecular bonds?

Isabella Chou 1A
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Re: Bond Strength and Polarizability

Postby Isabella Chou 1A » Thu Nov 19, 2020 4:36 pm

I think you might be confusing intramolecular and intermolecular forces as you said. Even if a molecule has strong bonds (which are intramolecular), it doesn't necessarily mean it will have strong intermolecular forces (such as London forces). I hope this helps!

Summer_Corona 3L
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Re: Bond Strength and Polarizability

Postby Summer_Corona 3L » Thu Nov 19, 2020 4:51 pm

As the previous person stated, you are mixing the two. However, a larger molecule, especially one that is rod-shaped, is able to have a stronger LDF than a smaller molecule. The reason for this is because the larger molecule has a larger surface area and can allow for more LDF to occur compared to the smaller one.

kateraelDis1L
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Re: Bond Strength and Polarizability

Postby kateraelDis1L » Thu Nov 19, 2020 5:08 pm

I agree with them^^ to further help, I just have it memorized that highly polarizable means strong London. It is better to differentiate in your head inter and intra molecular forces so you don't get confused.

105618850
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Joined: Wed Sep 30, 2020 9:38 pm

Re: Bond Strength and Polarizability

Postby 105618850 » Sat Nov 28, 2020 2:27 am

I agree, London dispersion forces are the forces between multiple molecules, or intermolecular forces. Topics that concern bond lengths relate to intramolecular forces.


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