Is matter pure?
Kerala Board · Class 9 · Science
Quick revision notes for Is matter pure? — Kerala Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Pure Substances vs Mixtures
- Pure substance in chemistry means uniform composition throughout, regardless of which part you examine
- Mixtures contain two or more substances that are not chemically combined and retain their individual properties
- Components of mixtures can be separated by physical methods
Types of Mixtures
- Homogeneous mixtures: Components uniformly distributed, appear the same throughout (e.g., salt in water, lemonade)
- Heterogeneous mixtures: Components not uniformly distributed, can distinguish different parts (e.g., oil and water)
- Solutions are homogeneous mixtures of solute (dissolved substance) and solvent (dissolving medium)
Solutions and Concentration
- Solution properties: particles too small to see, don't scatter light, don't settle on standing
- Saturated solution: No more solute can dissolve at given temperature
- Unsaturated solution: More solute can still be dissolved
Suspensions and Colloids
- Suspensions: Heterogeneous mixtures where particles are visible, settle on standing, can be filtered
- Examples of suspensions: chalk in water, mud in water
- Colloids: Appear homogeneous but are actually heterogeneous, particles scatter light (Tyndall effect)
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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