Sapling week 5 & 6 #5

[Sarah Hernandez 1F]

I got the other parts of this question right and I don't know why this one is wrong please help.

[Astha Patel 2J]

The formal charge on the carbon is a -2.

[Eva Becker]

Hi! The only error you have in this model is the charge on C. Carbon likes to make 4 covalent bonds, sharing 8 electrons and fulfilling its octet. However, given that it only has 2 covalent bonds, the 2 lone pairs indicate that Carbon should have a charge of -2. Hope this helps!

[Kaylee Messick 3J]

I got that the charge on carbon is -2 because the overall molecule must not have a charge. So because there are two positive charges, carbon would be -2 to offset that. Hope this helps!

[Isabelle Hales 1J]

Hi! The formal charge on the carbon atom would be -2, not -1. When we find the formal charge, we evaluate 4 - ((4/2)+4), which is equal to 4 - (2+4), or 4 - 6, which gives us a formal charge of -2. Additionally, the overall molecule does not have a charge so the formal charges of each individual atom should cancel each other out.

[LarisaAssadourian2K]

Hello! First, be sure that all the charges in this molecule cancel out because the overall charge is zero. That should be a trigger that there should be an extra negative charge somewhere (or in other cases, one less +). Next, be sure to remember that carbon usually likes to have four bonds, but in this case, it only has two. Thus, the charge on the carbon atom should be -2 instead of -1. I hope this helps!

[Lesly Lopez 3A]

Hi,
The formal charges on the atoms should add up to zero because the HCNO molecule is neutral. The most stable structure has the fewest number of, and smallest magnitude of, formal charges, and with the negative formal charges on the more electronegative elements. Both resonance structures B and C have the fewest and smallest magnitude of formal charges. Oxygen is the most electronegative atom in the molecule, so oxygen bears the negative formal charge in the most stable resonance structure. The number for C should be -2 not -1.

[Jared Limqueco 3E]

So C's FC is -2. This makes sense because this cancels the other charges, giving an overall charge of 0

[Justin Zhang_1A]

The formal charge for carbon should be -2, since it has 4 valence electrons, and 4 lone and 4 bonded electrons, so 4 - (4 + 4/2) = -2.

[nayha a 1E]

Hi, the formal charge on the C should be 2- because this would make the overall charge 0.

[jasmineculilap_3F]

C should have a formal charge of -2. Valence - free - bonding/2 = 4 - 4 - 4/2 = -2.

[Shivani Kapur 2J]

The formal charge on Carbon should be -2. Since Crabon has 4 valence electrons, 2 pairs of shared electrons, and 2 lone pairs of electrons. 4-(2+4) = -2. Hope this helps!

[Haochen He 3L]

The formal charge of C should be -2. FC= valence electrons (4) - (long pairs (4) + sharing electrons/2 (2))

[Isabella Cortes 2H]

the part that is incorrect about this problem is that Carbon's formal charge is -2 because it has 4 valence, 2 single bonds, and 4 lone electrons. When you plug all those numbers into the formal charge equation FC= valence- (bonds+ lone electrons), you get -2

[Dominic Benna 2E]

The formal charge on carbon would be -2, not -1

[Victoria_Sauceda_1B]

The negative on c is supposed to be a -2

[Morgan Gee 3B]

The formal charge of carbon should be -2. There are 4 bonds and 4 lone pairs so (4/2 + 4) = 6. The valence electrons of carbon is 4 so 4-6 = -2.

[Sarah Hernandez 1F]

Thanks everyone for your help, I get it now!

[Adam_ElSayed_3B]

To find resonance you would take the number of valence electrons of the respective Element, and from that subtract the number of electrons/bonds around it. A single bond counts as one, and each electron counts as one

[Adam_ElSayed_3B]

To find resonance you would take the number of valence electrons of the respective Element, and from that subtract the number of electrons/bonds around it. A single bond counts as one, and each electron counts as one

[105618850]

Since carbon only possesses two bonds, rather than the four it tends to form. Therefore, due to this abnormality, the formal charge would be -2.