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Unformatted text preview: nanni (arn437) HW11 Liquids and Solids vanden bout (50985) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A drop of liquid tends to have a spherical shape due to the property of 1. close packing. 2. vapor pressure. 3. capillary action. 4. surface tension. correct 5. viscosity. Explanation: Molecules on the surface of a liquid are influenced by intermolecular attractions to- wards the interior; these attractions pull the surface layer toward the center. The most sta- ble situation is one in which the surface area is minimal. For a given volume, a sphere has the least possible surface area. 002 10.0 points Surface tension describes 1. the resistance to flow of a liquid. 2. capillary action. 3. adhesive forces between molecules. 4. the forces of attraction between sur- face molecules of a solvent and the solute molecules. 5. the forces of attraction between the sur- face of a liquid and the air above it. 6. the inward forces that must be overcome in order to expand the surface area of a liquid. correct Explanation: Molecules in the interior of a liquid inter- act with molecules all around them, whereas molecules at the surface of a liquid can only be affected by those beneath the surface layer. This phenomenon leads to a net inward force of attraction on the surface molecules, con- tracting the surface and making the liquid behave as though it had a skin. Surface ten- sion is a measure of the inward forces that must be overcome to expand the surface area of a liquid....
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- Fall '10