Q1
We separate stones from rice mainly to:
Aremove impurities
Badd flavour
Cincrease weight
Dchange colour
CBSEClass 6 (CBSE)ScienceCh 9 · Topic 1
Why We Need to Separate Substances
Understanding the reasons for separating mixtures in daily life.
Core concept
The method chosen for separation depends on the physical properties of the substances involved, such as particle size, density, solubility, or boiling point. For example, sand and salt can be separated because salt dissolves in water while sand does not; iron filings mixed with sand can be separated using a magnet, since iron is magnetic and sand is not. Understanding why and how we separate substances is essential not just in the kitchen, but also in industries like water treatment, mining, and pharmaceuticals.
Exam highlight
Key diagram
- Show examples of mixtures we separate daily: rice with stones, tea leaves from tea.
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Quick notes
• Substances are separated to remove impurities, obtain useful components, or purify a mixture.
• The choice of separation method depends on physical properties like solubility, density, and magnetism.
• Sand and salt are separated based on solubility; iron filings and sand are separated using a magnet.
• Separation techniques are important in daily life as well as in industries like water treatment.