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Intermolecular Forces
Chapter Name : States Of Matter
Sub Topic Code : 102_11_05_02_03
Topic Name : Intermolecular Forces
Sub Topic Name : Dipole - Dipole Forces
Introduction

• Attractive forces between polar molecules are called dipole-dipole forces. • Dipole-dipole forces act between molecules having permanent dipole. • Ends of the dipoles possess “partial charges” and these charges are shown by delta (?). • This interaction is stronger than the London forces but is weaker than ion-ion interaction because only partial charges are involved. • The attractive force decreases with the increase of distance between the dipoles.

Pre-Requisites:

molecule, dipole, ion, partial charge

Activity:

Magnets have two poles and therefore are a di-pole.

Real Life Question:

What makes proteins fold properly in a red blood cell?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Dipole-dipole forces. Attractive forces between polar molecules .
Learning aids / Gadgets
Gadgets How it can be used
magnet Find the north and south pole of a magnet, a dipole works like a magnet.
Real life uses :

Protein flowing in red blood cells.

Places to visit :

Garage,

Practical examples around us
Examples Explainations
Magnet A magnet has two poles; the north pole attracts a south pole on a different magnet.
What you learn in Theory:

Dipole-dipole forces are found between polar molecules e.g. HCl.

What you learn in Practice:

Dipole-dipole forces are attractive forces between polar molecules that aid in formation of many vital molecules E.g. red blood cells.

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