CBSE Class 6 · Science
Methods of Separation in Everyday Life
Official NCERT chapter from Curiosity (book code fecu1). ExamMaster notes are original teaching at CBSE Class 6 depth.
This lesson follows the official chapter “Methods of Separation in Everyday Life” in Curiosity. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.
- CBSE Class 6
- Easy level
- 8 concepts
1Handpicking
Handpicking is taking out pieces you can see and grab: stones from grain, wilted leaves from spinach. The test is “I can tell them apart by eye and hand”.
Handpicking dissolved salt from water is the wrong method.
Figure. Handpicking uses a size you can see and a hand. Stones leave; grain stays. One property changes: the stones are removed. The rest of the heap is left as it was.
How it works
- See two kinds of piecesGrain and stone.
- Grab the ones you do not want (or the ones you do)The pick.
- Stop when the leftover is the kind you wantedA visible sort.
2Threshing
Threshing frees grain from the stalk or husk by beating or a machine’s beat. The job is “loosen the useful bit from the plant frame”.
Threshing a solution of salt is nonsense — there is no stalk.
Figure. Threshing frees grain from the ear by beating. The stalks stay; the grain falls free. The test is attachment, not size.
How it works
- Start with grain still on the plant frameThe mix.
- Beat or use the tool you were shownLoosen.
- Collect the freed grainThe useful bit.
3Winnowing
Winnowing uses wind (or a fan) so the lighter husk flies and the heavier grain falls nearer. The test is different heaviness in a breeze.
Winnowing two stones of the same heft does nothing useful.
Figure. Winnowing sorts by weight in a breeze. Husk is carried; grain falls near the pour. The one thing that changes is where each part lands.
How it works
- Lift the mix in a breezeOr pour it across a fan as shown.
- See light bits travel fartherHusk.
- See heavy bits drop closerGrain.
4Sieving
A sieve is holes of a chosen size. Smaller bits fall through; bigger bits stay. The test is size versus hole.
Sieving salt already dissolved in water is the wrong tool.
Figure. A sieve is a size gate. What is larger than the holes stays; what is smaller passes. The mesh is the one thing you set.
How it works
- Choose a hole-size that matches the jobFlour versus husk, sand versus pebbles.
- Shake or tap as you were shownThe sort.
- Keep what the holes were meant to keepTwo piles.
5Sedimentation and Decantation
Let heavy insoluble bits settle (sediment). Pour the liquid off carefully (decant). The pair is wait-then-pour, not shake-and-hope.
Decanting while it is still cloudy undoes the wait.
Figure. Sedimentation lets the heavy part fall. Decantation pours the liquid off after that. Do not stir while you pour or the mud rides out with the water.
How it works
- Leave the mix stillHeavy bits sink.
- Pour the liquid without dumping the settled pileDecant.
- Name both stepsSediment, then pour.
6Filtration
A filter (cloth, paper) lets liquid through and holds undissolved bits. It is a finer “sieve for wet mixes” than a kitchen mesh when the bits are small.
Filtration does not pull dissolved salt out of clear saltwater — the salt already went with the water.
Figure. Filtration is a finer size gate than a sieve. Residue stays on the paper; filtrate is the liquid that passed. The paper is the one thing you set.
How it works
- Pour the mix through the filter you were givenThe tool.
- Collect the liquid that comes throughFiltrate.
- See bits left on the filterResidue — if they were not dissolved.
7Evaporation
Heat the liquid away; the dissolved solid can stay as a crust. Evaporation here is a separation method, the same state-change as the drying plate, aimed at keeping the solid.
Evaporating to “destroy the salt” misses the job — the salt is what you often want to keep.
Figure. Evaporation takes the liquid as vapour and leaves the solid. The one change is that water goes. Salt is not created; it was already dissolved.
How it works
- Start with a solutionSaltwater.
- Let the water leave as vapourHeat, or time.
- See the solid remainThe separated bit.
8Magnetic separation
A magnet pulls magnetic bits and leaves the rest. Iron filings from sand is the classroom picture. Non-magnetic metals stay with the sand.
A magnet over aluminium scrap is the wrong hope.
Figure. Magnetic separation uses one property: attraction. Iron leaves the heap; sand does not. Keep the magnet the only new thing in the test.
How it works
- Spread the dry mixSand and filings.
- Sweep with a magnet (wrapped if you were told)Pull.
- See magnetic bits leave the restThe sort.
Dissolved salt in water is separated by
- Evaporation (or later, other solution methods) — not a sieve
- Handpicking
- Winnowing
Dissolved is not a piece you grab.
Notes
- Mapped to the official NCERT chapter “Methods of Separation in Everyday Life”. Original teaching only — no textbook sentences.
- Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.
Recap
Hold these pegs from the official chapter “Methods of Separation in Everyday Life”. The wording is ExamMaster’s teaching, not a textbook recap.
- Handpicking
- Handpicking is taking out pieces you can see and grab: stones from grain, wilted leaves from spinach.
- Threshing
- Threshing frees grain from the stalk or husk by beating or a machine’s beat.
- Winnowing
- Winnowing uses wind (or a fan) so the lighter husk flies and the heavier grain falls nearer.
- Sieving
- A sieve is holes of a chosen size. Smaller bits fall through; bigger bits stay. The test is size versus hole.
- Sedimentation and Decantation
- Let heavy insoluble bits settle (sediment).
- Filtration
- A filter (cloth, paper) lets liquid through and holds undissolved bits.
Practise Methods of Separation in Everyday Life
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- A 4-question practice set that ends the chapter
- 1 quick check with worked explanations
- Timed mocks scored with the real marking scheme
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