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Published byLydia Atkinson Modified over 8 years ago
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Polarity and Intermolecular Forces
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NonpolarPolar Diatomic molecules
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NonpolarPolar Polyatomic molecules
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Polar molecule or not? The shape of a molecule usually tells if a molecule is polar or not If the VSEPR shape is symmetric it is usually non-polar If the molecule is asymmetric it is polar
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The force that exists between separate molecules. This force attracts molecules to each other. 3 types: – London dispersion – Dipole-dipole – Hydrogen bond Intermolecular forces
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London dispersion Induced dipole between non polar molecules Weakest force (caused by the motion of electrons)
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Dipole-dipole Attractive forces between polar molecules Stronger force than dispersion
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Hydrogen Bond Forms between the hydrogen and the fluorine, oxygen, or nitrogen (FON) Strongest force of the three
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IMF’s ALL molecules have dispersion forces All polar molecules have dipole-dipole forces and dispersion forces Molecules that H-bond have all 3 forces
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Solubility of polar molecules Properties are due to intermolecular forces Like dissolves like -Polar substances will dissolve polar molecules -Non polar substances will dissolve non- polar molecules
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