L-6 Exploring Mixtures & their Separation | Ch-5 Class 9 Science New NCERT | Exploration | Tarif Sir

In this lecture, Tarif Sir completes Chapter 5 — Exploring Mixtures and their Separations — from the New NCERT Exploration textbook for Class 9 Science (Session 2026-27). This is the final lecture of the chapter covering Centrifugation, Coagulation, Colloids, Emulsions, and the last two Pause and Ponder questions. With this video, 100% of the chapter content (excluding the Exercise) is fully covered. --------------------------------------------------------- WHAT YOU WILL LEARN IN THIS LECTURE --------------------------------------------------------- Centrifugation — how the centrifuge machine works, centrifugal force, separation of heavy and light particles, and its use in separating RBCs from plasma in blood samples Paperfuge — a low-cost, hand-powered centrifuge model made from cardboard and thick thread; its use in disease testing (malaria, anaemia) in remote areas without electricity Coagulation — how tiny floating particles in a liquid are made to clump together to form heavier clusters that settle at the bottom; role of coagulants Coagulant — definition and example (alum / phitkari) used in water purification to remove mud particles Colloids — recap of dispersed phase and dispersion medium; how colloids differ from true solutions and suspensions Emulsion — a colloid where both dispersed phase and dispersion medium are liquids; two types: Oil in Water (milk, vanishing cream) and Water in Oil (butter, body lotion, cold cream) Emulsifying agents — substances that stabilise an emulsion and prevent the dispersed phase and dispersion medium from separating; example: proteins in milk and butter Important points — hydrogen-oxygen mixture as rocket fuel, dry ice (solid CO2) for ice cream storage, soap solution as emulsifying agent in oil-water mixtures Tyndall Effect — first explained by scientist John Tyndall Pause and Ponder Q9 — why clouds are a colloidal mixture (aerosol); dispersed phase = water droplets / ice crystals, dispersion medium = air Pause and Ponder Q10 — why cities with smoke and dust appear hazy; colloidal particles scatter sunlight (Tyndall Effect) --------------------------------------------------------- BOARDS COVERED --------------------------------------------------------- This lecture is useful for students of CBSE, RBSE, MPBSE, HPBSE, and UBSE preparing for Class 9 Science. --------------------------------------------------------- ABOUT THE TEACHER --------------------------------------------------------- Tarif Sir teaches at @TarifBhayana-9th10th — your go-to channel for Class 9 and Class 10 Science. For Class 9 and Class 10 Maths, visit our sister channel: @SanyamBhayana9-10th --------------------------------------------------------- TIMESTAMPS --------------------------------------------------------- 0:00 — Introduction and lecture overview 1:07 — Centrifugation (Method 3) 2:10 — How the centrifuge machine works 3:29 — Centrifugal force explained 5:52 — Applications of centrifugation (separating RBCs from plasma) 6:35 — Activity 5.8 — Paperfuge (mini centrifuge model) 7:45 — Paperfuge in healthcare (malaria and anaemia testing) 8:26 — Coagulation (Method 4) 9:26 — Definition of coagulation 10:27 — Coagulant — definition and example (alum / phitkari) 11:18 — Coagulation of sand from water using alum (diagram) 12:17 — Colloids — dispersed phase and dispersion medium 14:08 — Emulsion — definition and types 14:27 — Oil in Water vs Water in Oil emulsions 15:19 — Examples: milk, vanishing cream, butter, body lotion, cold cream 15:56 — Emulsifying agents 17:11 — Important points (rocket fuel, dry ice, soap as emulsifier, Tyndall Effect) 18:59 — Pause and Ponder Q9 — Are clouds a colloid? 22:00 — Pause and Ponder Q10 — Why do cities with smoke appear hazy? 24:11 — Chapter 5 complete — summary and outro --------------------------------------------------------- KEYWORDS --------------------------------------------------------- centrifugation class 9, coagulation class 9 science, colloid dispersed phase dispersion medium, emulsion class 9, oil in water emulsion, water in oil emulsion, emulsifying agent, paperfuge, alum water purification, phitkari use in water, tyndall effect class 9, clouds colloid aerosol, chapter 5 class 9 science new ncert, exploring mixtures and their separations, class 9 science cbse 2026-27, class 9 science rbse, class 9 science mpbse, class 9 science hpbse, class 9 science ubse, tarif sir class 9 science centrifugation class 9, coagulation class 9, colloid class 9, emulsion class 9, dispersed phase dispersion medium, emulsifying agent, paperfuge activity 5.8, alum water purification, phitkari class 9, tyndall effect, clouds colloid aerosol, chapter 5 class 9 science, exploring mixtures separations, new ncert exploration class 9, class 9 science cbse, class 9 science rbse, class 9 science 2026-27, tarif sir, TarifBhayana-9th10th