Chemistry Unit 5

“inter”

prefix meaning “between” or “among”

• think “international” means between different nations

“intra”

prefix meaning “within”

Forces between different substances

intermolecular forces

forces within a substance

intramolecular forces = chemical bonds

the intramolecular forces (bonds) within a molecular determine:

whether or not a molecule is polar

the polarity of a molecule will determine the

intermolecular forces (attractions) between different molecules

the intermolecular forces (IMF) will determine the:

properties we see on the macro level

• ex. boiling point, vapor pressure melting point, viscosity, surface tension, etc.

Polar molecules

have partial charges in different locations within the overall molecule

• ex. H₂O

Non