Intermolecular bonds
- Created by: Emily
- Created on: 19-04-14 09:15
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- intermolecular forces
- van der waals
- caused by instantaneous dipoles
- as a result of the changing position of the electron cloud
- the more electrons, the larger the instantaneous dipole and so the stronger the vdw's
- act between all atoms and molecules
- Act between all atoms and molecules
- explains...
- BP of Noble Gases increases with atomic number
- BP of Hydrocarbons increase with increased chain length
- caused by instantaneous dipoles
- Dipole - Dipole
- attraction between molecules with permanent dipoles
- two permanent dipoles will attract eachother
- And so will align themselves
- Not all molecules have a dipole moment - not all are polar
- two permanent dipoles will attract eachother
- attraction between molecules with permanent dipoles
- Hydrogen Bonding
- only with a very electronegative atom with a lone pair
- Fluorine
- Oxygen
- Nitrogen
- explains...
- H20/HCl BP is a lot higher than anything in its group
- As it has a Hydrogen Bond
- Energy required to turn from liquid - gas = much higher
- have to overcome stronger H-bonds
- Energy required to turn from liquid - gas = much higher
- As it has a Hydrogen Bond
- H20/HCl BP is a lot higher than anything in its group
- only with a very electronegative atom with a lone pair
- van der waals
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