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Polarity and Intermolecular Forces. NonpolarPolar Diatomic molecules.

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Presentation on theme: "Polarity and Intermolecular Forces. NonpolarPolar Diatomic molecules."— Presentation transcript:

1 Polarity and Intermolecular Forces

2

3 NonpolarPolar Diatomic molecules

4 NonpolarPolar Polyatomic molecules

5 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

6 The force that exists between separate molecules. This force attracts molecules to each other. 3 types: – London dispersion – Dipole-dipole – Hydrogen bond Intermolecular forces

7 London dispersion Induced dipole between non polar molecules Weakest force (caused by the motion of electrons)

8 Dipole-dipole Attractive forces between polar molecules Stronger force than dispersion

9 Hydrogen Bond Forms between the hydrogen and the fluorine, oxygen, or nitrogen (FON) Strongest force of the three

10 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

11 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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