What is a colloid? Write its properties. chapter 2 can study by students of class 9. These definitiona and formulas of Class 9 Science Chapter 2: is Matter Around Us Pure is developed and witten by our expert teachers. Science formulas. What is a colloid? Write its properties. is prepapred and collected from varius resources to help the students.
What is a colloid? Write its properties.
Answer: Colloid: A colloid is a heterogeneous mixture whose particles are not as small as solution but they are so small that cannot be seen by naked eye. When a beam of light is passed through a colloid then the path of the light becomes visible. For example milk, smoke etc.
Properties of a colloid
• A colloid is a heterogeneous mixture.
• The size of particles of a colloid is too small to be individually seen by naked eyes.
• Colloids are big enough to scatter a beam of light passing through it and make its path visible.
• They do not settle down when left undisturbed, that is, a colloid is quite stable.
• They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known as centrifugation can be used to separate the colloidal particles.
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