Is Matter Around us Pure? — Flashcards
Karnataka Board · Class 9 · Science
20 flashcards for Is Matter Around us Pure? (Karnataka Board Class 9 Science) to test yourself on key terms and facts.
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A shopkeeper claims his salt is 'pure'. From a scientific perspective, what does pure actually mean?
Answer
Scientifically, pure means all constituent particles are the same in chemical nature. A pure substance consists of a single type of particle. Commercial 'pure' salt may still contain impurities, but c…
Why does copper sulphate solution look uniform throughout while oil and water mixture has visible layers?
Answer
Copper sulphate forms a homogeneous mixture (solution) where particles are evenly distributed at molecular level, creating uniform appearance. Oil and water form a heterogeneous mixture due to differe…
Calculate the mass percentage of a solution containing 25g of sugar dissolved in 100g of water.
Answer
Mass of solute = 25g, Mass of solvent = 100g, Mass of solution = 25 + 100 = 125g. Mass percentage = (Mass of solute/Mass of solution) × 100 = (25/125) × 100 = 20%. The solution is 20% sugar by mass.
Why can you see dust particles dancing in a sunbeam entering through a window, but not in clear water?
Answer
Dust particles in air form a colloid that scatters light (Tyndall effect), making the light beam visible. Clear water is a pure substance with particles too small to scatter light significantly. The s…
What happens when you filter a mixture of sand and water? Why doesn't this work for salt water?
Answer
Sand-water: Sand particles are larger than filter paper pores, so sand remains as residue while water passes through as filtrate. Salt-water: Salt dissolves completely forming a solution with particle…
Why can you dissolve more sugar in hot tea than in cold tea?
Answer
Solubility generally increases with temperature. Hot tea has higher kinetic energy, causing water molecules to move faster and interact more effectively with sugar molecules, breaking intermolecular f…
What is a suspension and why do particles settle down when left undisturbed?
Answer
A suspension is a heterogeneous mixture where solid particles are dispersed in liquid but don't dissolve. Particles settle due to gravity because they are large (>1000 nm), dense, and not supported by…
Why is brass considered a mixture even though you cannot separate copper and zinc from it easily?
Answer
Brass shows properties of both constituent metals (copper and zinc) and can have variable composition (typically 70% copper, 30% zinc). Even though physical separation is difficult, it's still a solid…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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