Lewis Structure tips?

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Mario Reyes 1C
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Lewis Structure tips?

Postby Mario Reyes 1C » Mon May 21, 2018 5:56 pm

When we finish completing a lewis structure and find that the formal charges of all atoms are not 0 in a neutral molecule (even though all the charges add up to 0), should we always try to make something a double/triple bond and try to make all the formal charges zero. It seems like a very tedious process that takes time, and we don't have that much time during tests. Does anybody have any tips?

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Re: Lewis Structure tips?

Postby Chem_Mod » Tue May 22, 2018 8:41 pm

First satisfy octet rule (if it's not a radical)
Then look at formal charges
Then break octet rule to minimize formal charges IF ALLOWED (period 3+, group 13, etc)

This is one strategy.

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Re: Lewis Structure tips?

Postby kendallbottrell » Tue May 22, 2018 9:56 pm

For larger organic molecules (with lots of C,H,O,N) a TA suggested doing the Lewis structure and leaving the hydrogens off at first, then calculating the formal charge, and then adding the H atoms where they are needed to neutralize the formal charges. This was very efficient and it helped me a lot, although I am not sure if we have to do molecules like that often.

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