CBSE · Class 9 · Science · Chapter 5

Exploring Mixtures and their Separation

Investigate mixtures, solutions and different separation techniques based on the properties of substances.

13 lessons 50 min
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Lessons in this chapter

  1. 1How Can We Classify Mixtures?Salt vanishes, chalk settles, and milk quietly refuses to explain itself.
  2. 2SolutionsThe solute disappears from sight, but it certainly has not left the beaker.
  3. 3How Do We Express Concentration?Three percentage methods walk into a solution, and the denominator decides who is who.
  4. 4Solubility of SubstancesSome solids love warm water; others barely notice the temperature change.
  5. 5CrystallizationA patient solution cools slowly and builds crystals one orderly particle at a time.
  6. 6DistillationOne liquid escapes as vapour, cools off, and arrives in a different flask.
  7. 7Paper ChromatographyBlack ink reveals that it has been a tiny colour crowd all along.
  8. 8How Can We Separate the Components of Heterogeneous Mixtures?Oil and water finally agree on one thing: they would rather live on separate floors.
  9. 9SublimationCamphor takes the vapour shortcut while sand stays exactly where it was.
  10. 10SuspensionsWhen tiny particles refuse to settle politely, spinning and clumping enter the story.
  11. 11ColloidsA colloid looks calm and uniform while billions of tiny particles stay busily dispersed.
  12. 12Tyndall EffectA beam of light becomes visible only when tiny particles decide to reveal its path.
  13. 13Chapter Summary and PracticeEvery mixture has a separation strategy—except lemonade after someone drinks it.
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