Intramolecular Forces V.S. Intermolecular Forces

Molecular Forces

Intramolecular Forces- Forces between atoms that hold molecules together and determine the chemical behavior or substances

Ionic
Covalent

Intermolecular Forces- Forces between molecules

Dipole-dipole interactions
Hydrogen Bonding
London Dispersion Forces

Intermolecular Forces

Much weaker than intramolecular bonds but they are important because they determine physical properties of the molecules :
-Melting Point
-Boiling Point
-Density
-Viscosity
-Volatility

There are three types of intermolecular forces

Dipole-dipole interactions
Hydrogen Bonding- Important in Water and DNA
London Dispersion Forces

More polarized bonds in a molecule results in greater intermolecular attractions
Greater intermolecular attractions have higher melting and boiling points, greater viscosities, and lower volatiles than non-polar covalent compounds.

Examples: Honey and Syrup

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Scenario: If I wanted to pour honey into a container, it would flow very slow. To quicken the process, I would need to heat up the honey to break/ weaken the intermolecular forces to make it flow quicker,

	Intermolecular Bonds	Intramolecular Forces
Definition	Forces Between Molecules	Forces Between Atoms
Weaker or Stronger (Than Other Force	Weak	Strong
What Characteristics Do they Determine?	Physical (Heating up the substance can allow it to flow quicker, which changes its physical properties.)	Chemical (By breaking the intramolecular forces, it will split the atoms which will change the element that it is.)
Is it a Force or a Bond?	Force	Bond
Three Types	1. Dipole-dipole Interactions \n 2. Hydrogen Bonding3. London Dispersion Forces	1. Ionic2. Polar Covalent3. Non-Polar Covalent