| IMF definition | weak interactions between dipoles of a different molecules |
| types of IMF | Induced dipole-dipole (LONDON)
permanent dipole-dipole
Hydrogen bonding |
| What are IMF responsible for | melting and boiling ptts and density |
| London forces... | ... Electrons move causing uneven distribution ... a tempory instantaneous dipole is set up in one molecule... induces a temp dipole in adjacent molecule hence the attraction |
| Permanent dipole-dipole interactions | -asymmetrical
-polar
-forever |
| Simple Molecular substance is | small units containing a definte number of atoms |
| Properties of simple MS | -low melting and boiling point due to weak intermolecular forces
-covalent bonds do not break
-soluble in non polar soluvents - hexane
-non conductors of electricity - fixed p and no charged carriers |
| Why don't Simple MS dissolve in water | little interaction between the molecules in the lattice and the polar solvent molecules |
| Hydrogen bonding | The lone pair on the electronegative atom on one molecule and the electron deficient hydrogen on an adjacent molecule |
| Hydrogen bonding has the strongest imf ? | yes |
