Consider the following substances: i. CaO ii. CH_4 iii. NH_3 and iv. KCl a. Indi

Question

Consider the following substances: i. CaO ii. CH_4 iii. NH_3 and iv. KCl a. Indicate the dominant "intermolecular force" (includes ion-ion interactions) for each substance. b. Rank the substances according to their "intermolecular bond energy", Highest first; comment if ambiguous. a. Rank the acidity (strongest acid first) of the following neutral substances: A. H_2S B. NH_3 C. H_2O b. Indicate the conjugate base of each; include charges. (in the same order as in your answer to a.) c. Which of the species under b. is the strongest base? d. There are two (2) molecular variables that determine the acid strength of binary acid i. Give their names: _____ ii. Which of the two is dominant when, in a particular row, going from the left to the right of the Periodic Table. _____

Explanation / Answer

Q25.

intermolecular forces --> ion-ion, ionic, ion-dipole, dipole-dipole, induced dipole

so

CaO = ionic

CH4 = dispersion

NH3 = dipole-dipole

KCl = ionic

b)

bond energy:

K-Cl > CaO > NH3 > CH4

note that chlorine is pretty electronegative, so expect the strnogest bond here

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