Resonance vs. Lewis Structure?

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Yasmine Choroomi 2C
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Joined: Fri Jul 22, 2016 3:00 am

Resonance vs. Lewis Structure?

Postby Yasmine Choroomi 2C » Sat Oct 22, 2016 2:43 pm

Hi! How do you know when you're just supposed to draw one lewis structure vs. when you're supposed to draw every lewis structure to show resonance? Do you just always draw all possible structures or if it just says draw lewis you draw only one but if it says show resonance you draw all?

Thanks!!

Genesis_Lavelle_1F
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Joined: Wed Sep 21, 2016 2:59 pm

Re: Resonance vs. Lewis Structure?

Postby Genesis_Lavelle_1F » Sat Oct 22, 2016 3:48 pm

If it has a formal charge its most likely that you have to draw resonance, because it shows the multiple ways the molecule can form.

Chris_Rudewicz_3H
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Re: Resonance vs. Lewis Structure?

Postby Chris_Rudewicz_3H » Mon Oct 24, 2016 10:43 pm

It should ask for resonance structures in the question if that is what they are looking for. If it just asks to draw THE lewis structure, like in question 101a in chapter 3, there is only one correct structure.

Jimmy Zhou 3D
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Joined: Sat Jul 09, 2016 3:00 am

Re: Resonance vs. Lewis Structure?

Postby Jimmy Zhou 3D » Tue Oct 25, 2016 12:43 pm

Usually, you will know that you have a resonance structure when it is obvious that the double bond in the molecule can be used interchangeably between the other atoms and the central atom.

Joyce Wu 3E
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Re: Resonance vs. Lewis Structure?

Postby Joyce Wu 3E » Tue Oct 25, 2016 1:45 pm

If the question requires you to draw the resonance, it will probably always ask you specifically to. Otherwise, the question would state: "draw the most STABLE lewis structure". Which simply means the one with the lowest formal charge.

Ashley Bertholf 1E
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Joined: Fri Jul 15, 2016 3:00 am

Re: Resonance vs. Lewis Structure?

Postby Ashley Bertholf 1E » Mon Nov 07, 2016 12:22 am

You will more than likely be asked specifically to draw a resonance structure, you won't typically know to do it on your own without instruction. However, when drawing lewis structures even if there is resonance you should simply draw the one with the lowest formal charges if the question doesn't include anything explicitly about resonance.

Jennah Muhammad 1H
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Re: Resonance vs. Lewis Structure?

Postby Jennah Muhammad 1H » Sun Jul 09, 2017 10:36 pm

I'm always confused on how to draw the different resonance structures.. does it matter how you move the double bonds around if it has the same arrangements of atoms

Alejandra Reyna 1E
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Joined: Wed Sep 21, 2016 2:58 pm

Re: Resonance vs. Lewis Structure?

Postby Alejandra Reyna 1E » Sun Jul 09, 2017 10:48 pm

I believe you can move the double bonds around as long as the Octet rule is being satisfied.

Tara 1F
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Joined: Fri Jun 23, 2017 11:39 am

Re: Resonance vs. Lewis Structure?

Postby Tara 1F » Sun Jul 16, 2017 5:09 pm

The difference between these is a subject I'm struggling with. Does anyone have any tips/homework problems that they think help explain?

604744616
Posts: 34
Joined: Sun Jun 25, 2017 3:00 am

Re: Resonance vs. Lewis Structure?

Postby 604744616 » Wed Jul 19, 2017 8:41 pm

But how exactly do we know when we are able to have a resonance structure? Like what are the characteristics we should
look for in order to figure that out? or is every lewis structure have a resonance?


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