What Is A Solution?
Chapter Name : Is Matter Around Us Pure? |
Sub Topic Code : 102_09_02_02_03 |
Topic Name : What Is A Solution? |
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Sub Topic Name : What Is A Colloidal Solution? |
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Introduction
Basic Properties of colloids
Pre-Requisites:
Basic knowledge about heterogeneous mixtures and suspensions
Activity:
Observe tyndall effect using milk + water and a torch light.
Real Life Question:
Milk and water is a colloidal mixture. Do you observe milk getting settled down when left undisturbed?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Colloid | Colloid is a heterogeneous mixture with particles considerably small compared to suspensions. |
| Tyndall effect | The scattering of light by colloids is called as tyndall effect. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Colloidal examples | List out where we see colloids in day to day life. |
Real life uses :
Soap foam bubbles are considered as colloids
Practical examples around us
| Examples | Explainations |
|---|---|
| Why do we observe the dispersion of light in the morning around a tree? | This is because of tyndall effect. The mist contains tiny water droplets which help in scattering of light. So we observe dispersion of light. |
What you learn in Theory:
Colloids ,Properties of colloids, Tyndall effect
What you learn in Practice:
The day to day life light scattering explanations and understanding differences between colloids and suspensions