What is the strongestattractive force that must be overcome in order to do the f

Question

What is the strongestattractive force that must be overcome in order to do the following: I melt pure solid phosphorus pentachloride II boil pure liquid selenium tetrafluoride III boil pure liquid methanol (CH3OH) IV sublime pure solid carbon dioxide V melt pure solid potassium metal A. I dipole-dipole II dispersion III H-bond IV dipole-dipole V dispersion B. I dispersion II dipole-dipole III H-bond IV dispersion V metallic bond C. I dispersion II dispersion III dipole-dipole IV dispersion V metallic bond D. I covalent bond II polar covalent bond III H-bond IV polar covalent bond V dispersion Also, please EXPLAIN your answer, if you simply put "A" I /will/ rate your answer 1 star.

Explanation / Answer

B is correct.

explanation:
a) melt pure solid phosphorus pentachloride
phosphorus pentachloride is nonpolar, thus the strongest intermolecular force is London dispersion force.

b) boil pure liquid selenium tetrafluoride

selenium tetrafluoride is polar, thus the strongest one is dipole-dipole interaction

c) boil pure liquid methanol (CH3OH)

CH3OH can form hydrogen bonds (H-O---H).

d) sublime pure solid carbon dioxide

CO2 is nonpolar, thus the dispersion force is the strongest.

e) melt pure solid potassium metal

K is metal. the intermolecular force between metal atoms is call metallic bond

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