Methods of Separation: 20 flashcards
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1. What is threshing?
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The process of beating harvested crops to separate the grains from the stalks.
2. What is winnowing?
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The method used to separate chaff from grain by wind or blowing air.
3. What is chaff?
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Seed coverings and tiny pieces of leaves or stem left after threshing.
4. What is hand-picking used for?
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Removing impurities like small stones, dirt, husks, or broken grains when the quantity is small and impurities look different.
5. What is filtration?
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The process by which an insoluble solid is separated from a liquid by passing the mixture through a filtering device.
6. What is evaporation?
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The process in which a liquid changes into a gas.
7. What is condensation?
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The process in which a gas changes into a liquid.
8. What is a solute?
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The substance that dissolves in a solvent.
9. What is a solvent?
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The substance in which the solute dissolves.
10. What is a solution?
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The mixture formed when a solute dissolves in a solvent.
11. What is a saturated solution?
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A solution in which no more solute can be dissolved.
12. What is solubility?
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The ability of a substance to get dissolved in a given liquid.
13. How does heating affect solubility?
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Heating increases the solubility of a solute, so more can dissolve in hot water than in cold.
14. How does stirring affect dissolving?
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Stirring makes a solute dissolve faster, but does not change how much can dissolve.
15. How does powdering affect dissolving?
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Powdered or crushed sugar dissolves faster than a whole sugar cube.
16. Why can't filtration separate salt from water?
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Salt is dissolved, not suspended, so it passes through the filter paper with the water.
17. What is a combine harvester?
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A machine that reaps, threshes, and cleans the crop in one operation.
18. How is salt obtained from sea water?
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Sea water is collected in shallow pits; the Sun's heat evaporates the water, leaving salt behind.
19. What is dew an example of?
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Condensation — water vapour in the air condenses on a cold surface.
20. What happens to chaff after winnowing?
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It is used as fodder for cattle.
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