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D. Give reasons.1. When the temperature falls, theintermolecular space decreases.2. Water forms droplets.3. Brownian motion is not observed in solids4. Boiling of a liquid takes place from anypoint within the liquid5. Evaporation takes place only at the surface6. When a gas is cooled to a certain point, itcondenses.7. The melting point and freezing point of asubstance are the same. |
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Answer» Explanation: 1)On cooling gases and liquids, temperature falls intermolecular attraction increases intermolecular space between molecules decreases. 2) SURFACE tension causes water to form spherical droplets and allows it to SUPPORT small objects, like a SCRAP of paper or a needle, if they are placed carefully on its surface. Water molecules inside the center of the droplet have more neighboring water molecules to interact with than water molecules at the surface. 3)The Brownian movement is due to the bombardment of collodial particles by the molecules of dispersion medium which are in the constant motion like molecules in a GAS. 4)Some high energy particles on the liquid surface may have enough energy to escape the intermolecular forces of attraction of the liquid and become a gas. ... When a liquid reaches its BOILING point bubbles of gas form in it which rise into the surface and burst into the air. |
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