Intermolecular Forces
- Created by: Lucy Rennie
- Created on: 27-03-19 21:02
View mindmap
- Intermolecular Forces
- London Dispersion Forces
- Electrons are constantly moving around the nucleus and can align at one side of the nucleus at times
- When this happens, a partial positive and partial negative side of the atom arises
- The weak attraction between the partial positive and partial negative side of two atoms is known as a London Dispersion Force
- When this happens, a partial positive and partial negative side of the atom arises
- These forces are the weakest of the three types of inter-molecular force
- London dispersion forces can be found in all molecules, but non-polar molecules are the only molecules which have no other force acting between their molecules
- We can say that non-polar molecules are likely to have low melting and boiling points as London Dispersion Forces are easily broken by small amounts of energy
- Electrons are constantly moving around the nucleus and can align at one side of the nucleus at times
- Dipole-Dipole Interactions
- Different elements have different values of electro-negativity
- In molecules, one element will have a partial positive charge and one a partial negative charge
- The force found between the partial positive and partial negative of two molecules is known as a Dipole-Dipole Interaction
- In molecules, one element will have a partial positive charge and one a partial negative charge
- These interactions are slightly stronger than London Dispersion Forces but a lot weaker than Hydrogen bonding
- Dipole-Dipole Interactions can be found only in polar molecules
- Use the trick: Polar bears live at the north and south pole
- Different elements have different values of electro-negativity
- Hydrogen Bonding
- Hydrogen Bonding can be found between hydrogen and either fluorine, nitrogen or oxygen
- The most common example of hydrogen bonding is in water molecules or molecules which have hydroxyl groups
- Use rhyme: Hydrogen Bonding is FON (like fun but fon for the elements:))
- Hydrogen Bonding is the strongest form of inter-molecular force
- We can say that molecules with hydrogen bonding have high melting and boiling points as the inter-molecular forces require a lot of energy to break them
- Hydrogen Bonding can be found between hydrogen and either fluorine, nitrogen or oxygen
- London Dispersion Forces
Comments
No comments have yet been made