Colloids Around Us
Chapter Name : Surface Chemistry |
Sub Topic Code : 102_12_05_07_01 |
Topic Name : Colloids Around Us |
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Sub Topic Name : Colloids Around Us |
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Introduction
We examine the nature of the colloids around us and their innate processes, such as the color of the sky, the creation of artificial rain, the formation of deltas, and so on.
Pre-Requisites:
Aluminoid, Styptic, Scattering, Protective Colloid, Adsorption, Coagulation, Electrolyte, Suspension, Sol.
Activity:
When we bang our knees against a table, we get a bruise and it often turns red internally due to blood clotting. Blood is a colloid and it clots through coagulation.
Real Life Question:
How is artificial rain stimulated? Why is the sky blue?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Artificial rain | Stimulating rain by using electrified sand or charged sol, to be sprayed on to clouds from an airplane. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Videos | To understand some of the processes better, like the stimulation of artificial rain. |
| Examining familiar colloids | Such as foods like ice-cream, or how a cut heals through clotting blood. |
Real life uses :
Colloids are all around us, from the foods we eat, to the color of the sky above our heads, to the soil under our feet. They are part of most of our daily activities.
Places to visit :
Your favorite foods- ice-cream is a colloid, as is fruit juice! Out in the garden- plants grow on the nutrients in the soil, and the nutrients are in the soil because of adsorption, soil being a colloid as well.
Practical examples around us
| Examples | Explainations |
|---|---|
| Soil | It is a colloid that adsorbs nutrients on to it. |
| Foods | Ice-cream and gelatin used in jelly are also colloids. |
| The blue sky | It is blue because the particles in air scatter blue wavelength of light into our eyes. |
What you learn in Theory:
The processes involved in the functioning of many of the familiar colloids in real life.
What you learn in Practice:
Which of the objects around us are colloids, and how they serve a purpose in our lives?