Intermolecular Forces

Atoms and molecules sticking together

WHAT IS THE DIFFERENCE BETWEEN INTER- AND INTRA- MOLECULAR FORCES?

Directions

On a small portion of paper write all appropriate words you can think of that start with inter- and intra-

For example: interstate and intravenous

Directions

Now as a table, combine all the words onto one sheet of white paper.

Divide the words into two columns titled: inter- and intra-

Count how many your table can think of and record this number on the board.

Share

We will now collect all the appropriate words on a list.

Purpose

What does “intra” mean when used in these words and what does “inter” mean in these words?

Inter- means between two separate things.

An interstate highway connects multiple states together.

Interpret is to convert from one language to another.

Intra- means within something

Intrapersonal is when a person is looking for something within themselves.

CONNECTING INTRA AND INTER WITH CHEMISTRY

Intramolecular Forces

An intramolecular force is between the atoms which make-up the compound or molecule.

For example: covalent bonds between hydrogen and carbon in CH3CH3 and ionic bonds between Na and Cl in NaCl (and metallic bonds)

Intermolecular Forces

This is a force which occurs between two or more separate molecules.

Four Types of Intermolecular Forces

Ion-dipole

Dipole-dipole

London dispersion forces

Hydrogen bonding

- These types will be defined later.

Similarity

They are both sticking things together…. but intramolecular forces are stronger then intermolecular forces.

Difference

Breaking an intermolecular force does NOT change the compound or molecule.

Breaking an intramolecular force DOES change the compound or molecule (to something new!)

Difference

Intermolecular forces can easily be broken by adding heat.

Intermolecular forces influence when the substance melts and boils.

Difference

Intramolecular forces build molecules.

Intramolecular forces create “units”