Unit 2 chemistry

how chemistry works

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  • Created by: Oliver
  • Created on: 07-05-11 12:15

Bonding

1.     Chemical bonds: -

1.      Ionic – between separate ions

2.      Covalent: divided into 2 types

o       polar covalent where the bonding pair of electrons is       nearer to one atom

o       Pure covalent where the bonding pair of electrons is shared equally

o       Metallic- bonding caused by electrons delocalised throughout the solid

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Intermolecular forces

2.     Intermolecular forces (BETWEEN covalent molecules)

o       Hydrogen bonds: Between δ+ H in one molecule and δ- F,O or N in another molecule

o       Dispersion forces: between all molecules. Their strength depends upon the number of electrons in the molecule.

o       Dipole/dipole forces (aka Van Der Waals): between δ+ in one molecule and δ- in another molecule.

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Comments

melvin

i believe that Van der Waals are forces between the temporarily induced dipole moments by the interaction of one molecule with another. the small δ+ and δ- charges delineated by this are van der waals. what you have described as van der waals are actually just dipole dipole forces in polar molecules. ^^

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