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.
Attachments
Screen Shot 2020-11-15 at 12.06.27 AM.png

Kristina Krivenko 3I
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Joined: Wed Sep 30, 2020 9:52 pm
Been upvoted: 1 time

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
Posts: 108
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: 91
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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Joined: Wed Sep 30, 2020 9:49 pm

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
Posts: 87
Joined: Wed Sep 30, 2020 9:36 pm

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.

RitaThomas_3G
Posts: 85
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
Posts: 73
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
Posts: 89
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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