Chapter-Chapter 9. Methods of Separation in Everyday Life Science Curiosity class 6 in english Medium CBSE Notes

Chapter 9. Methods of Separation in Everyday Life

These CBSE Notes – Key Points are prepared according to the latest NCERT Curiosity textbook and the latest CBSE competency-based pattern. They provide quick revision of important concepts, definitions, scientific terms, methods of separation, and their applications in daily life.

CBSE Notes – Key Points

These notes are useful for quick revision before examinations. Read the important definitions, keywords, tables, and facts carefully to strengthen your conceptual understanding.

Important Keywords

The following keywords are frequently used in this chapter and should be remembered carefully.

Keyword	Meaning
Mixture	A physical combination of two or more substances.
Handpicking	Removing visible impurities by hand.
Threshing	Separating grains from harvested stalks.
Winnowing	Separating lighter particles from heavier particles using wind.
Sieving	Separating particles based on their size.
Sedimentation	Settling of heavier insoluble particles at the bottom.
Decantation	Carefully pouring the clear liquid into another container.
Filtration	Separating insoluble solids from liquids using a filter.
Evaporation	Obtaining dissolved solids by removing the liquid.
Churning	Separating butter or cream from curd.
Magnetic Separation	Separating magnetic substances using a magnet.

Important Definitions

Learn the following definitions carefully as they are frequently asked in examinations.

Term	Definition
Mixture	A physical combination of two or more substances that can be separated by physical methods.
Filtration	The process of separating insoluble solids from liquids using a filter.
Sedimentation	The settling down of heavier insoluble particles in a liquid.
Decantation	The process of pouring the clear liquid without disturbing the settled particles.
Evaporation	The process of converting a liquid into vapour to obtain dissolved solids.

Methods of Separation

Different mixtures require different methods of separation depending on the physical properties of their components.

Method	Used For	Example
Handpicking	Removing large visible impurities	Stones from rice
Threshing	Separating grains from stalks	Harvested wheat
Winnowing	Separating lighter and heavier particles	Husk from grain
Sieving	Separating particles of different sizes	Flour and bran
Sedimentation	Settling heavy particles	Muddy water
Decantation	Separating clear liquid	Oil and water
Filtration	Removing insoluble solids	Tea leaves from tea
Evaporation	Obtaining dissolved solids	Salt from seawater
Churning	Separating butter	Butter from curd
Magnetic Separation	Separating magnetic materials	Iron filings from sand

Selection of Separation Method

The suitable method of separation depends upon the physical properties of the substances.

Property	Suitable Method
Difference in Size	Handpicking, Sieving
Difference in Weight	Winnowing
Difference in Density	Sedimentation, Decantation
Difference in Solubility	Filtration, Evaporation
Magnetic Property	Magnetic Separation

Applications in Daily Life

Methods of separation are used in many daily-life activities.

• Cleaning rice and pulses before cooking.
• Separating tea leaves from tea.
• Obtaining salt from seawater.
• Preparing flour using a sieve.
• Separating butter from curd.
• Purifying drinking water.
• Removing iron pieces from scrap.
• Separating grains after harvesting.

Important Facts

Remember these important facts for examinations.

• A mixture contains two or more substances.
• No single method can separate every mixture.
• Physical properties determine the method of separation.
• Handpicking is suitable only when impurities are few and visible.
• Winnowing requires moving air.
• Sieving separates particles of different sizes.
• Filtration removes insoluble solids from liquids.
• Evaporation is used to obtain dissolved solids.
• Churning separates butter from curd.
• Magnets attract magnetic substances such as iron.

Scientific Terms

The following scientific terms are important for quick revision.

Scientific Term	Meaning
Mixture	Combination of two or more substances.
Residue	Solid left on the filter paper after filtration.
Filtrate	Liquid collected after filtration.
Impurities	Unwanted substances mixed with useful materials.
Soluble	Substance that dissolves in water.
Insoluble	Substance that does not dissolve in water.

Quick Revision

Revise these important points before your examination.

• Mixtures can be separated by physical methods.
• Choose the separation method according to the physical properties of the substances.
• Handpicking removes large visible impurities.
• Threshing separates grains from stalks.
• Winnowing separates lighter husk from heavier grains.
• Sieving separates particles based on size.
• Sedimentation allows heavy particles to settle.
• Decantation separates the clear liquid from settled particles.
• Filtration removes insoluble solids using a filter.
• Evaporation is used to obtain dissolved solids from a solution.
• Churning separates butter from curd.
• Magnetic separation removes magnetic materials.
• Separation methods are widely used in homes, agriculture, industries, and laboratories.

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