How to tell when an molecule is resonant?

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kellyz_1C
Posts: 33
Joined: Fri Apr 06, 2018 11:05 am

How to tell when an molecule is resonant?

Postby kellyz_1C » Wed Jun 06, 2018 12:41 pm

How do you tell when a molecule is resonant versus when it's just moving around in space? When drawing some of the resonance structures I could not tell

Raquel Floyd 1K
Posts: 19
Joined: Wed Sep 21, 2016 2:59 pm

Re: How to tell when an molecule is resonant?

Postby Raquel Floyd 1K » Wed Jun 06, 2018 5:44 pm

A molecule has resonance when the electrons can not be expressed by just one lewis structure. If there are multiple ways you can draw it, then it has resonance. If you draw a lewis structure, and then simply turn your page so the molecule is oriented differently, that is not resonance. That would be the just "moving around in space".

Yitzchak Jacobson 1F
Posts: 31
Joined: Wed Nov 22, 2017 3:00 am

Re: How to tell when an molecule is resonant?

Postby Yitzchak Jacobson 1F » Mon Jun 11, 2018 1:03 am

you can tell when a molecule is resonant by knowing if there are multiple ways to draw the lewis structure.
Hope this helps you :)

AlyssaRivera
Posts: 29
Joined: Fri Apr 06, 2018 11:04 am

Re: How to tell when an molecule is resonant?

Postby AlyssaRivera » Mon Jun 11, 2018 9:28 pm

Yitzchak Jacobson 1F wrote:you can tell when a molecule is resonant by knowing if there are multiple ways to draw the lewis structure.
Hope this helps you :)

does this simply mean changing around where elements are places on the central atom or which types of bonds are there?

Fayez Kanj
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Joined: Fri Sep 28, 2018 12:18 am
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Re: How to tell when an molecule is resonant?

Postby Fayez Kanj » Tue Oct 30, 2018 6:29 pm

Hello!

A molecule is resonant if it has double/triple bonds that can be placed elsewhere (between different atoms of the same elements) without changing the chemical bonds in the molecule. A resonance structure could also simply be changing the central atom (there was an example of this in the book, but the element with the lowest electronegativity is in the center). As a general rule of thumb, any molecule in which you could "draw" differently, while maintaining its chemical bonds/properties is a resonance structure.

Hope this helps :)

105002507
Posts: 30
Joined: Fri Sep 28, 2018 12:15 am

Re: How to tell when an molecule is resonant?

Postby 105002507 » Wed Oct 31, 2018 12:06 am

whats the maximum number of different ways to write a lewis structure?

Xingzheng Sun 2K
Posts: 62
Joined: Fri Sep 28, 2018 12:29 am

Re: How to tell when an molecule is resonant?

Postby Xingzheng Sun 2K » Wed Oct 31, 2018 6:42 am

This is a good question because the example given in lecture C6H6 has two possible structures, while indeed they are just one turning around. I believe it is still a resonance for the reason that it can also be seen as the change of single bond and double bond of the Cs in the structure.

Archana Biju 1G
Posts: 29
Joined: Fri Sep 28, 2018 12:18 am

Re: How to tell when an molecule is resonant?

Postby Archana Biju 1G » Thu Nov 01, 2018 11:37 pm

You can tell a molecules is resonant if there is more than one lewis structure that works for the molecule - this can be found by moving around the double and triple bonds around the molecule.


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