Intermolecular Forces

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Intermolecular Forces

Van der waals is the weakest and the strongest is the hydrogen bonding, however none of them are as strong as a typical Convalent bond

Van Der Waals

Exsist between all molecules.

The only intermolcular force which exsists between non polar molecules.

Eg) CH4 C2H6

Electrons continuenly moving, creats a temporary dipole. They attract adjcent molecules.

Weakeast force but strength increases through the size of the moleule(Mr). The larger the molecule the more electroins present the more van der waals forces avaliable. Evidence for this is the boilding points, the increase with the size of the molecule.

Dipole-Dipole

Only ocucur between polor molecule. Eg) Hydrogen Halides HCL HBr HI

Eg) Hydrogen Chloride;

Chlorine is more electronegative than hydrogen and attrats the shared pair of electrons in the convalent bond towards itself. This creates a perminant dipole.

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