Formal Charge

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Formal Charge

Postby Niveda_Tennety_1H » Tue Oct 25, 2016 6:52 pm

Is formal charge in any way related to polarity?

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Re: Formal Charge

Postby Chem_Mod » Tue Oct 25, 2016 11:18 pm

The concepts are related. However, to be exact, polarity is a practical and measurable quality of a molecule or bond. Formal charge is more of a theoretical or bookkeeping concept that helps predict the locations of electrons in a molecule using simple valence bond theory.

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Re: Formal Charge

Postby Tara_White_3L » Thu Oct 27, 2016 6:18 pm

If we are asked to give the formal charges for each atom of a Lewis Structure, do we give the average of the formal charges? Are we supposed to know which elements get exclude from resonance (ex. Sulfur since it is harder to form a double bond with it?)

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Re: Formal Charge

Postby Emma_Green_2C » Fri Oct 28, 2016 1:20 pm

When you are asked to give the formal charge for each atom within a Lewis structure, you just calculate that using the formal charge formula. You don't need to give an average. As for the second half of your question, the problem will probably indicate whether multiple Lewis structures (resonance) are required.

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