All molecules will have induced dipole-dipole interactions, also known as London forces, as at any point, the movement of electrons can create an instantaneous dipole which induces a dipole nearby etc.
Only molecules that are polar covalent, or have a 'permanent dipole', will have the additional, permanent dipole-dipole interactions.
Molecules will have a permanent dipole if the difference in electronegativity is greater than 0 and less than 1.8. For example, Br2 would not, because Br and Br have the same electronegativity, so there is 0 difference.
If a molecule has multiple bonds, permanent dipoles may reinforce eachother, making a stronger permanent dipole, or cancel out (if the molecule is symmetrical).
Hope that helps, sorry if it's a bit unclear
Only molecules that are polar covalent, or have a 'permanent dipole', will have the additional, permanent dipole-dipole interactions.
Molecules will have a permanent dipole if the difference in electronegativity is greater than 0 and less than 1.8. For example, Br2 would not, because Br and Br have the same electronegativity, so there is 0 difference.
If a molecule has multiple bonds, permanent dipoles may reinforce eachother, making a stronger permanent dipole, or cancel out (if the molecule is symmetrical).
Hope that helps, sorry if it's a bit unclear
Original post by katiee987
All molecules will have induced dipole-dipole interactions, also known as London forces, as at any point, the movement of electrons can create an instantaneous dipole which induces a dipole nearby etc.
Only molecules that are polar covalent, or have a 'permanent dipole', will have the additional, permanent dipole-dipole interactions.
Molecules will have a permanent dipole if the difference in electronegativity is greater than 0 and less than 1.8. For example, Br2 would not, because Br and Br have the same electronegativity, so there is 0 difference.
If a molecule has multiple bonds, permanent dipoles may reinforce eachother, making a stronger permanent dipole, or cancel out (if the molecule is symmetrical).
Hope that helps, sorry if it's a bit unclear
Only molecules that are polar covalent, or have a 'permanent dipole', will have the additional, permanent dipole-dipole interactions.
Molecules will have a permanent dipole if the difference in electronegativity is greater than 0 and less than 1.8. For example, Br2 would not, because Br and Br have the same electronegativity, so there is 0 difference.
If a molecule has multiple bonds, permanent dipoles may reinforce eachother, making a stronger permanent dipole, or cancel out (if the molecule is symmetrical).
Hope that helps, sorry if it's a bit unclear
Thanks!
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