POGIL 25. Predict which of the following species is NOT commonly found in nature

Question

POGIL

25. Predict which of the following species is NOT commonly found in nature. CH2 NO" RMS 26. The molecules BHs and SF6, and the ion SO are found in nature. Is this consistent with Lewis predictions? Explain why or why not 27. The following are NOT legitimate Lewis structures (and the formal charges are missing). Show (as in the example) how a single pair of electrons can be moved to make the Lewis structure legitimate. H :O : O 28. Some of the following Lewis structures are missing formal charges. Fill in the formal charges (other than zero) where needed. Then use your list of factors (from question 20) to verify that each completed Lewis structure is correct. a) NH b) CH COOH c) HN

Explanation / Answer

Q25.

CH2 --> NOT likely to occur naturaly, since Carbon has 4 valence electrons and H has only 1. The most common stable specie will be CH2+2 or even CH2-2.

NO+ --> this is pretty common in the protonation of Nitrous acid, HNO2, even though it is not that stable, it is common in earth, specially when producing nitrous acid

HONO + H+ NO+ + H2O

HO- --> this is actually the Hydroxide ion; more commonly in aquous solution, specially if basic solution is present. It is common in the autoionization of water:

H2O(l) + H2O(l) <--> H3O+(aq) + OH-(aq)

Therefore, choose CH2

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