How sand and chalk powder settle down in water ?...
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The chalk powder and the sand are both solids that do not dissolve in water. This means that these solid compounds are insoluble in water. b) The chalk powder and sand particles are more dense than the water molecules and this is why they settle at the bottom of the container.
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Sand” is normally assumed to be quartz sand so almost pure silicon dioxide. The sand will sink to the bottom pretty quickly. The chalk will also mostly settle out but the finer grains may stay in suspension - prevented from falling to the bottom by random collisions with the water molecules.
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