Help Please!

[AllahIsGreater]

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Hey guys,

So while looking over my gen chem notes from chads, he was talking about intermolecular forces, and than asked what type of forces does NaCl have. The answer is none, and i understand that, since NaCl is not a molecule. However he later said to rank intermolecular forces as follows:

ionic or network covalent>hydrogen bonding>dipole-dipole> london dispersion


so im really confused as why hes including ionic covalent in this?!?!? Please help!

Thanks!

 

[AllahIsGreater]

I think i figured it out. Does he mean that by forces (h-bonding, dipole-dipole, london dispersion) there are none. However, overall, NaCl would have stronger intermolecular forces as compared to Ch3OH?.....if that makes sense

 

[Jab1113]

I think i figured it out. Does he mean that by forces (h-bonding, dipole-dipole, london dispersion) there are none. However, overall, NaCl would have stronger intermolecular forces as compared to Ch3OH?.....if that makes sense

NaCl is an ionic bond which cannot form a molecule. In the lecture of the intermoleculat forces, Chad explained that Hydrogen Bonding would trump against dipole-dipole and london-dispersion when looking for higher b.p. or m.p.

However, if NaCl is present, it will be stronger than hydrogen bonding and trump all of them. Think about it, Na+ and Cl-, there is going to be a much stronger force pulling the electrons towards the more electronegative atom (Cl-)

Ionic Bonding > Covalent > Hydrogen Bonding > Dipole-Dipole > London Dispersion


👍

 

[bharat008]

Ionic Bond > Ion Dipole > Hydrogen Bonding > Dipole-Dipole > Dipole Induced Dipole > London Dispersion Forces

You will barely encounter Dipole Induced Dipole on DAT, so you can ignore that..

 

[AllahIsGreater]

Yea I def understand you guys. But the question i still have confusing me is, if it doesnt have any intermolecular forces, than why is it being compared to intermolecular forces? I mean if it comes up on the DAT ill remember that if it asks which as higher intermolecular forces i would pick anything that isnt ionic....however if it asks for higher bp or mp i would pick the ionic....i hope you guys are understanding my question. sorry if im confusing you

 

[Jab1113]

Yea I def understand you guys. But the question i still have confusing me is, if it doesnt have any intermolecular forces, than why is it being compared to intermolecular forces? I mean if it comes up on the DAT ill remember that if it asks which as higher intermolecular forces i would pick anything that isnt ionic....however if it asks for higher bp or mp i would pick the ionic....i hope you guys are understanding my question. sorry if im confusing you

If I understood Chads video on this subject, I believe he said that everything has intermolecular forces, i.e. NaCl for example when disassociated with water will form ion-dipole interactions because for example the Na+ ion will make an ion-dipole interaction with the O- in the water molecule (or vice versa that Cl- forming an ion-diploe interation with one of the H+ on the water molecule)

Hope that made sense.