Intermolecular Forces
Chapter Name : States Of Matter |
Sub Topic Code : 102_11_05_02_01 |
Topic Name : Intermolecular Forces |
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Sub Topic Name : Intermolecular Forces |
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Introduction
• Intermolecular forces are the forces of attraction and repulsion between interacting particles (atoms and molecules). Attractive intermolecular forces are known as Van der Waals forces. • Van der Waals forces vary considerably in magnitude and include dispersion forces or London forces, dipole-dipole forces, and dipole-induced dipole forces.
Pre-Requisites:
molecule, dipole, ion,
Activity:
Solids have strong intermolecular forces, liquids have weak intermolecular forces. Therefore it is difficult for solids to flow.
Real Life Question:
What holds two molecules of water together to form a droplet?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Intermolecular forces | Forces of attraction or repulsion between molecules. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| A magnet and a nut bolt | See how a magnet attracts an iron nut bolt, similarly intermolecular forces of attraction work. |
Real life uses :
Water is the main medium in blood, which allows it to flow in the veins.
Places to visit :
Garage,
Practical examples around us
| Examples | Explainations |
|---|---|
| Ice and water | Ice has stronger intermolecular forces between its particles therefore, it is solid whereas water has weaker intermolecular forces, so it fluid. |
What you learn in Theory:
Forces of attraction and repulsion between molecules are called intermolecular forces E.g. dipole-dipole, London dispersion forces etc.
What you learn in Practice:
Substances are solid, liquid or gaseous mainly due to different intermolecular forces between their molecules.