Kit Library / Science / Chemistry
⚡ Topic Learning KitShared by a Veda learner · Generated with Veda AI
Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. The bites below come from this kit — swipe through them in the app.
Separate by what makes them different.
Every separation method exploits a difference in properties between the components of a mixture.
↳ No single method works for all mixtures — the property difference decides the method.
Beat the crop, free the grain.
↳ Threshing separates grain from stalk — by hand, bullock, or combine harvester.
Wind carries chaff, grain falls straight.
Winnowing separates chaff from grain using wind or blowing air.
↳ Winnowing works because chaff is lighter than grain — wind separates them into two heaps.
Waste chaff becomes cattle food.
The chaff separated during winnowing is not wasted — it is used as fodder for cattle.
↳ Separation by-products can be useful — chaff becomes fodder.
Spot it, pick it, done.
Hand-picking removes impurities (stones, dirt, husks, broken grains) that look very different from the food item.
↳ Hand-picking is best for small quantities with visibly different impurities.
Solid stays back, liquid slips through.
Filtration separates an insoluble solid from a liquid using a filtering device like filter paper.
↳ Filtration works only if the solid particles are bigger than the pores of the filter.
Dissolved salt slips right through.
↳ Filtration handles insoluble solids only; dissolved solids need evaporation.
Heat it — water leaves, salt remains.
The mixture is heated; the liquid evaporates, leaving the solid behind.
↳ Evaporation recovers a dissolved solid by removing the liquid as vapour.
Cold surface turns steam into drops.
↳ Condensation needs a cold surface — it's how we recover evaporated water.
Boil, catch the steam, keep both.
Combining evaporation + condensation lets you recover both components of saltwater.
↳ Salt stays in the kettle; water is collected in the container.
Dissolve, filter, then evaporate.
A salt–sand mixture needs two processes because the components differ in solubility.
↳ Filtration + evaporation together separate salt from sand.
Three words, one glass of sugar water.
Example: sugar (solute) + water (solvent) = sugar solution.
↳ Solute dissolves in solvent to form a solution.
Salt vanishes; sand stays put.
↳ Solubility decides whether you filter or evaporate.
Extra sugar just sits at the bottom.
If you keep adding sugar and stirring, grains start collecting at the bottom — the solution has become saturated.
↳ A saturated solution cannot dissolve any more solute at that temperature.
Hot water holds more sugar.
Heating a saturated solution lets you dissolve more solute — the quantity that dissolves in hot water is much more than in cold water.
↳ Heating increases solubility, so a saturated solution can take more solute when warmed.
Stir it or crush it — it dissolves quicker.
↳ Stirring and using powdered solute speed up dissolving — they don't change how much dissolves.
The dissolver isn't the dissolved.
↳ Solute dissolves; solvent dissolves it — keep the roles straight.
One line per mixture — exam gold.
↳ Exam questions often ask 'which method?' — match the property difference to the method.
Different substances mixed together are separated using methods like threshing, winnowing, hand-picking, filtration, evaporation, and condensation. The choice of method depends on the properties of the components — size,…
Full explanation, worked examples & memory tricks in the app
All 17 questions, laddered from warm-up to topper-level, each with its answer and the reasoning behind it.
Q1. Which property is used to separate chaff from grain during winnowing?
BeginnerC · Difference in weight
Winnowing uses wind to carry away the lighter chaff while the heavier grain falls almost vertically.
Q2. A farmer wants to separate grains from stalks after harvesting. Which method should be used?
BeginnerA · Threshing
Threshing is the process of beating harvested crops to separate grains from stalks.
Q3. Which of the following is an insoluble substance in water?
BeginnerC · Sand
Sand does not dissolve in water; it is an insoluble substance. Salt and sugar are soluble.
Q4. In a saltwater solution, what is salt called?
BeginnerA · Solute
The substance that dissolves is the solute. Water is the solvent, and the mixture is the solution.
Q5. Which of the following is NOT a method of separating mixtures?
BeginnerC · Dissolving
Dissolving is a process of mixing, not separating. Condensation, evaporation, and filtration are separation methods.
Q6. A combine harvester performs reaping, threshing, and cleaning of the crop in a single operation.
BeginnerA · True
A combine harvester performs reaping, threshing, and cleaning of the crop in a single operation.
Q7. A student adds sugar to water and stirs until no more sugar dissolves. What is this solution called?
IntermediateB · Saturated solution
A saturated solution is one in which no more solute can be dissolved at that temperature.
Q8. Why is hand-picking preferred for removing small stones from rice at home?
IntermediateA · The quantity is small and stones look different
Hand-picking is preferred when the mixture is small, impurities are few, and they differ in size, shape, or colour.
Q9. What happens to the solubility of sugar in water when the solution is heated?
IntermediateD · It increases
Heating increases the solubility of a solute, so more sugar can dissolve in hot water than in cold.
Q10. Which method would you use to separate a mixture of sand and water?
IntermediateD · Filtration
Sand is an insoluble solid, so filtration separates it from water; sand is retained on the filter paper.
Q11. In the winnowing activity, why does the lighter chaff form a separate heap from the grain?
IntermediateD · Wind carries chaff away while grain falls almost vertically
The lighter chaff is carried by the wind, while the heavier grain falls almost vertically, forming a separate heap.
Q12. What is the role of the filter paper in filtration?
IntermediateD · It retains insoluble solid particles and lets liquid pass
The filter paper has fine pores that trap insoluble solid particles while allowing the liquid to pass through.
Q13. A student claims that salt water can be separated by filtration. Why is this incorrect?
AdvancedA · Salt is dissolved and passes through the filter paper
Filtration only removes insoluble solids. Dissolved salt passes through the filter paper with the water.
Q14. A mixture contains salt and sand. Which sequence of methods will separate both components?
AdvancedC · Dissolve in water, filter, then evaporate
Salt dissolves in water while sand does not. Filtration removes sand, and evaporation recovers salt from the salt solution.
Q15. Which statement about stirring and heating is correct?
AdvancedB · Stirring speeds up dissolving; heating increases solubility
Stirring changes the rate of dissolving, while heating changes the amount that can dissolve (solubility).
Q16. Why does powdered sugar dissolve faster than a whole sugar cube?
AdvancedC · Powder has more surface area in contact with water
Powdered sugar has more surface area, so it dissolves faster. Solubility itself is not changed by powdering.
Q17. A mixture contains salt, sand, and water. You need to separate all components efficiently. Which sequence of methods would you use?
AdvancedC · 1. Filtration to remove sand, 2. Dissolve salt in water, 3. Evaporation to recover salt
The correct sequence involves first using filtration to remove sand (which is insoluble), then dissolving the salt in water (since salt is soluble), and finally using evaporation to recover the salt from the salt solution. This method effectively utilizes the differing solubility…
20 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
Every game is built from this kit's own content — scores feed your mastery, so playing counts as studying.
Word Match
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True False
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Memory Match
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Flashcard Battle
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Speed Quiz
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Guess Term
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Sequence Builder
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Categorization
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Revision Battle
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