Alternative version of formula


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105002507
Posts: 30
Joined: Thu Sep 27, 2018 11:15 pm

Alternative version of formula

Postby 105002507 » Sun Nov 04, 2018 7:17 pm

Does the formula...

FC = group # - (bonds + nonbinding e-)

work the same as the one presented in lecture? This formula makes more sense to me and seems to result in all the same results.

305113590
Posts: 40
Joined: Thu Sep 27, 2018 11:28 pm

Re: Alternative version of formula

Postby 305113590 » Sun Nov 04, 2018 7:22 pm

Yes, I use that same formula as well. The 1/2 part in the formula is just used to account for the bonds. Your formula works just the same.

Anand Narayan 1G
Posts: 39
Joined: Thu Sep 27, 2018 11:15 pm

Re: Alternative version of formula

Postby Anand Narayan 1G » Mon Nov 05, 2018 12:36 am

Yes, your formula work, but I prefer to use FC = Valence Electrons - (Lone Electrons + Shared Electrons/2)

Laura Gong 3H
Posts: 53
Joined: Thu Sep 27, 2018 11:26 pm
Been upvoted: 1 time

Re: Alternative version of formula

Postby Laura Gong 3H » Mon Nov 05, 2018 1:16 pm

What works for me is: Formal Charge = Valence Electrons - (Dots + Dashes). Dots representing number of electrons that are unbounded and dashes representing the number of bonds.

Cole Elsner 2J
Posts: 46
Joined: Thu Sep 27, 2018 11:25 pm

Re: Alternative version of formula

Postby Cole Elsner 2J » Mon Nov 05, 2018 1:52 pm

Yes it works, use whatever formula you're most comfortable with, but understand what the formula presented means.

Adam Vuilleumier 2K
Posts: 39
Joined: Thu Sep 27, 2018 11:27 pm

Re: Alternative version of formula

Postby Adam Vuilleumier 2K » Mon Nov 05, 2018 2:21 pm

Dr. Lavelle uses FC=valence electrons - (free electrons + bound electrons/2) because it helps us to understand that each line, or bond, in the Lewis structure represents 2 electrons. You can also use FC=valence electrons - (dots+lines) though because counting each line is the same thing as multiplying each line by 2 to get the amount of electrons and then dividing it by two in the equation. The bottom line is that we should be memorizing concepts not equations.

ellienelson4F
Posts: 7
Joined: Thu Sep 27, 2018 11:27 pm

Re: Alternative version of formula

Postby ellienelson4F » Mon Nov 05, 2018 3:01 pm

You can use both, but make sure you understand why they both work! The "dashes" represent bonds, which in the lecture formula is represented by the /2, so the numbers will come out the same for this reason.

Nicklas_Wright_1A
Posts: 39
Joined: Thu Sep 27, 2018 11:23 pm

Re: Alternative version of formula

Postby Nicklas_Wright_1A » Tue Nov 13, 2018 5:45 pm

Yes, they both work and I think your formula is much easier to remember and use.


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