Sapling #4

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Shreya Patel- 2D
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Joined: Wed Sep 30, 2020 10:01 pm

Sapling #4

Postby Shreya Patel- 2D » Sat Nov 14, 2020 10:08 pm

Hi everyone! I understand how to draw one of the resonance structures, but I have no idea how to draw the third. I think the one on the left is correct, but the one on the right is wrong with what I have. I have put the file below of my answers. Thank you!

The question for reference:
A Lewis structure of the carbamate ion is shown.
Draw the two other major resonance structures. Be sure to include all nonbonding electrons and formal charges where appropriate.
Screen Shot 2020-11-15 at 12.06.27 AM.png

Kristina Krivenko 3I
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Re: Sapling #4

Postby Kristina Krivenko 3I » Sat Nov 14, 2020 10:14 pm

Hi! Both of your Lewis structures are correct, except you incorrectly identified formal charges on the second one (where there is a double bond between C and N). N does have a positive formal charge. However, the formal charge on C is 0, and the formal change on both O is -1.

Aliya 1H
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Joined: Wed Sep 30, 2020 9:34 pm

Re: Sapling #4

Postby Aliya 1H » Sat Nov 14, 2020 10:16 pm

hey! N has a +, both O's have a - and the C doesn't have any charge on it.

Shreya Patel- 2D
Posts: 96
Joined: Wed Sep 30, 2020 10:01 pm

Re: Sapling #4

Postby Shreya Patel- 2D » Sat Nov 14, 2020 10:46 pm

Thank you all for helping me out! I've been stuck on this one for an hour!

Brandon Le 3C
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Re: Sapling #4

Postby Brandon Le 3C » Sun Nov 15, 2020 12:54 am

So the structures themselves should be correct, but on Lewis Structure C, the N needs to have a +1 charge, while each O should have a -1 charge. In total, there are -2 charges on the O and +1 charge on the N, which would form a -1 charge on the entire structure. Also, most of the time when you have an O with 6 lone pairs and 2 shared electrons, the formal charge on the O is usually -1.

Andrew Yoon 3L
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Re: Sapling #4

Postby Andrew Yoon 3L » Sun Nov 15, 2020 4:02 pm

Hi, so for this problem, you have both structures correct. However for structure C, both O's (oxygens) should have a negative charge rather than C (carbon) having a negative charge. N (nitrogen) has the correct charge.

Posts: 90
Joined: Wed Sep 30, 2020 9:40 pm

Re: Sapling #4

Postby RitaThomas_3G » Sun Nov 15, 2020 5:25 pm

Hey! So in terms of structure it looks correct. However, for C, the charges are incorrect. C should not have a charge, and both O should have a negative charge. The N is correct! This will bring the overall formal charge to -1.

Jacquelyn Challis 2B
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Joined: Wed Sep 30, 2020 9:42 pm

Re: Sapling #4

Postby Jacquelyn Challis 2B » Sun Nov 15, 2020 6:17 pm

The next part of this question asks: "Which of the Lewis structures would be expected to contribute the least to the overall structure of the carbamate ion?" How would I figure out the answer to this?

Sukhkiran Kaur 3I
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Joined: Wed Sep 30, 2020 10:03 pm

Re: Sapling #4

Postby Sukhkiran Kaur 3I » Sun Nov 15, 2020 7:53 pm

N has a +1 charge, the O's have a -1 each, and the C doesn't have any charge.

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