Intermolecular Forces
Chapter Name : States Of Matter |
Sub Topic Code : 102_11_05_02_05 |
Topic Name : Intermolecular Forces |
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Sub Topic Name : Hydrogen Bond |
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Introduction
• Hydrogen bond is a special case of dipole-dipole interaction found between molecules in which highly polar N–H, O–H or H–F bonds are present. • Molecules also repel each other. When two molecules are brought into close contact with each other, the repulsion between the electron clouds and between the nuclei of two molecules comes into play.
Pre-Requisites:
molecule, bond, electronegative, electron cloud
Activity:
Hammering a nail inside a piece of wood is easy with a hammer as the nail resists compression so everytime, it is hammered, it pointed tip pierces the wood.
Real Life Question:
What makes two DNA strand to join? Why can’t you compress water?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Hydrogen bond | Special case of dipole-dipole interaction found between molecules in which highly polar N–H, O–H or H–F bonds are present. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Piece of wood | If u try to crush a piece of wood, it would not compress, as the molecules have repulsive forces between them which resist compression. |
Real life uses :
Hammering a nail
Places to visit :
Garage
Practical examples around us
| Examples | Explainations |
|---|---|
| Hammering a nail | Hammering a nail inside a piece of wood is easy with a hammer as the nail resists compression so every time, it is hammered, it pointed tip pierces the wood. |
What you learn in Theory:
Hydrogen bond is a special case of dipole-dipole interaction found between molecules in which highly polar N–H, O–H or H–F bonds are present. Molecules also repel each other. When two molecules are brought into close contact with each other, the repulsion between the electron clouds and between the nuclei of two molecules comes into play.
What you learn in Practice:
Hydrogen bonds keep two DNA strands together. Repulsive forces resist compression in solids and liquids.