What state of matter is represented by these particles? Solids

In order to melt this solid the forces of attraction between these particles must be overcome.

The forces between these liquid particles are weaker now since the particles are further apart

If the substance is heated further the liquid can turn into a gas

If the substance is cooled the gas will turn back into a liquid

and then into a solid

the energy required to overcome these forces of attraction determine the substance’s melting point.

the more energy required, the higher the melting point.

Types of Intermolecular Forces Between Molecules

London Dispersion Forces – very weak attractive forces between all molecules

nonpolar Types of Intermolecular Forces Between Molecules London Dispersion Forces – only important between non-polar molecules

polar Types of Intermolecular Forces Between Molecules Dipole – Dipole Forces – Stronger attractive force between polar molecules

Types of Intermolecular Forces Between Molecules Hydrogen Bonds – Stronger attractive force between polar molecules with O, F, N and H

Types of Intermolecular Forces Between Molecules Hydrogen Bonds – Stronger attractive force between polar molecules with O, F, N and H HH O   HH O   HH O   HH O   HH O   HH O   HH O   HH O   HH O   HH O   HH O   HH O  

Homework – pg. 88 #