Colloids — Chapter Summary
NIOS · Class 12 · Chemistry
Summary of Colloids for NIOS Class 12 Chemistry. Key concepts: Matter can be classified by, Every colloid has two and Lyophilic colloids ('solvent.
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Overview
Colloids are fascinating mixtures that exist between true solutions and suspensions. The term 'colloid' comes from Greek words meaning 'glue-like.' You encounter colloids daily in milk, butter, paint, smoke, and many other substances. Understanding colloids is crucial because they play vital roles i
Key Concepts
Matter can be classified by particle
Matter can be classified by particle size: True solutions have particles less than 1 nm, colloidal solutions have particles between 1-100 nm, and susp
Every colloid has two components
Every colloid has two components: the dispersed phase (substance present in small proportion, 1-100 nm size) and the dispersion medium (the medium in
Lyophilic colloids ('solvent
Lyophilic colloids ('solvent-loving') have great affinity for the dispersion medium—they form easily by mixing (gum, gelatin, starch) and are reversib
Colloidal particles undergo continuous
Colloidal particles undergo continuous, random, zig-zag movement called Brownian motion, discovered by Robert Brown. This occurs because molecules of
When a strong beam of light
When a strong beam of light passes through a colloidal solution, the path of light becomes visible and illuminated. This occurs because colloidal part
Learning Objectives
- Understand the differences between true solutions, colloidal solutions, and suspensions based on particle size
- Identify and classify different types of colloidal systems based on the physical states of dispersed phase and dispersion medium
- Learn methods to prepare colloidal solutions through physical and chemical techniques
- Explain the unique properties of colloids including Brownian motion, Tyndall effect, and electrical properties
- Understand the Hardy-Schulze rule and coagulation mechanisms
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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