formal charge


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Abigail Carter 4G
Posts: 50
Joined: Sat Sep 07, 2019 12:19 am

formal charge

Postby Abigail Carter 4G » Sun Nov 03, 2019 10:30 pm

When you are drawing lewis structures do you always need to solve for formal charge? Are there molecules that automatically do not have a formal charge and therefore don't need to solve the equation for?

Akshay Chellappa 1H
Posts: 59
Joined: Wed Sep 11, 2019 12:15 am

Re: formal charge

Postby Akshay Chellappa 1H » Sun Nov 03, 2019 10:36 pm

I believe that you only need to solve for formal charge if the question asks you to find the lowest energy lewis structure. I believe you wouldn't need to find the formal charge for compounds such as methane, ethane, and some of the other alkanes because they consist of single bonds and there aren't any loan pair electrons found in those compounds.

Maggie Eberhardt - 2H
Posts: 97
Joined: Sat Jul 20, 2019 12:16 am

Re: formal charge

Postby Maggie Eberhardt - 2H » Sun Nov 03, 2019 10:58 pm

So just to clarify, we only have to find the formal charge when it asks us to? Or should we always draw lewis structures using formal charge?

Jillian C 4C
Posts: 51
Joined: Sat Jul 20, 2019 12:16 am

Re: formal charge

Postby Jillian C 4C » Mon Nov 04, 2019 12:03 am

I think you should only solve formal charge when the question asks or if there's resonance and you want to find the most stable structure.

Abigail_Hagen2G
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

Re: formal charge

Postby Abigail_Hagen2G » Sun Nov 10, 2019 8:17 pm

You really only need to do it when they ask for it. But you should when drawing resonance structures just so you can find out if it's more stable.

RasikaObla_4I
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: formal charge

Postby RasikaObla_4I » Sun Nov 10, 2019 8:47 pm

Usually, you only want to find formal charges if the question asks for it, but when drawing lewis structures with or without a charge, you want to calculate the formal charge of each atom and see if all the formal charges add up to the charge of the molecule.

Maya Gollamudi 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: formal charge

Postby Maya Gollamudi 1G » Sun Nov 10, 2019 9:21 pm

If a molecule can potentially have multiple possible structures, it is a good idea to calculate the formal charge of each atom so that you are drawing the lowest energy structure possible.

Ashley Nguyen 2L
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am
Been upvoted: 1 time

Re: formal charge

Postby Ashley Nguyen 2L » Sun Nov 10, 2019 10:24 pm

Formal charge is really mostly used to find the most stable resonance structure, so I would calculate it if a molecule has more than just single bonds


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