Is matter pure? — Flashcards
Telangana Board · Class 9 · Physical Science
20 flashcards for Is matter pure? (Telangana Board Class 9 Physical Science) to test yourself on key terms and facts.
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Why does milk separate into cream and liquid when churned?
Answer
Churning causes centrifugal force that separates components based on density. Cream (fat) is lighter and comes to surface, while denser liquid stays below. This proves milk is a mixture, not a pure su…
A solution contains 40g sugar in 160g water. Calculate the mass percentage of sugar.
Answer
Mass of solute = 40g, Mass of solvent = 160g, Mass of solution = 40 + 160 = 200g. Mass percentage = (40/200) × 100 = 20%…
What is a mixture and how does it differ from pure substances?
Answer
A mixture contains two or more components that are not chemically combined and retain their individual properties. Unlike pure substances, mixtures have variable composition and can be separated by ph…
Why does salt dissolve in water but not in kerosene?
Answer
Salt is polar and water is polar ('like dissolves like' principle). Kerosene is non-polar, so polar salt cannot dissolve in it. This creates homogeneous mixture with water but heterogeneous with keros…
What happens when you heat a saturated sugar solution and why?
Answer
More sugar dissolves because solubility increases with temperature. Higher kinetic energy of molecules allows more solute particles to interact with solvent molecules, increasing dissolution rate and …
How do you separate ammonium chloride from salt using sublimation?
Answer
Heat the mixture in china dish covered with inverted funnel. Ammonium chloride sublimes (solid→gas→solid), deposits on funnel walls. Salt remains in dish as it doesn't sublime at this temperature.
Why can you see the path of light beam in milk but not in sugar solution?
Answer
Milk is a colloid with particles large enough (1-100nm) to scatter light (Tyndall effect). Sugar solution has dissolved particles too small to scatter light, so beam path is invisible.
What is the difference between homogeneous and heterogeneous mixtures?
Answer
Homogeneous: uniform composition throughout (salt water, air). Heterogeneous: non-uniform composition with visible boundaries (oil-water, sand-salt). Homogeneous appears as single phase, heterogeneous…
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