19. Which of the following species cannot act as a Lewis base? A. NH2 B. CH4 C.

Question

19. Which of the following species cannot act as a Lewis base? A. NH2 B. CH4 C. H20 D. NHs 20. In the reaction: Cuo(s)+ CO2(g) CuCOs(s) A. Cu2 acts as a Lewis acid and CO,2 acts as a Lewis base. B. CuO is the Lewis acid and CuCOs is its conjugate base. C. O2 acts as a Lewis base and CO2 acts as a Lewis acid. D. O acts as a Lewis base and Cu2* acts as a Lewis acid. II. Essay Questions: 150 pts 1. Fill in the missing information in the following table. PH pOH OH Acidic/Basic/Neutral? Solution a 3.00 Solution b Solution c Solution d Solution e 1.00 x 106 Neutral 10.0 M 2.00 2. Are the aqueous solutions of following chemicals acidic, basic, or neutral? (a) NH&NOs;: h Na20:

Explanation / Answer

Lewis acid : is a specie that accepts a pair of electrons itself being deficient of electrons.

Lewis base : is a specie that donates a pair of electrons itself carrying extra pair of electrons.

NH2- : N atom has lone pair of electrons and a negative charge so it is capable of donating electons . It is a lewis base.

H2O : contains 2 lone pairs of electrons that O can donate , it can donate its electrons and act as a lewis base.

CH4 : the bonding electrons =8, C contains no lone pair, it is uncapable of donating electrons , hence it cannot act as a lewis base,

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