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Liquids

Liquids. Many physical properties related to internal attraction of atoms. Surface tension Capillary action Beading Viscosity Stronger interparticle attractions cause each of these to increase. Surface tension. Molecules in the middle are attracted in all directions.

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Liquids

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  1. Liquids • Many physical properties related to internal attraction of atoms. • Surface tension • Capillary action • Beading • Viscosity • Stronger interparticle attractions cause each of these to increase.

  2. Surface tension • Molecules in the middle are attracted in all directions. • Molecules at the top are only pulled inside. • Minimizes surface area.

  3. Capillary Action • Liquids spontaneously rise in a narrow tube. • Competition between two forces • Cohesion – attraction to same molecules (water to water for example) • Adhesion – attraction to something different (water to glass) • Glass is polar. It attracts water molecules.

  4. Nonpolar liquid mercury forms a convex meniscus in a glass tube, whereas polar water forms a concave meniscus.

  5. Beading If a polar substance is placed on a non-polar surface, there are cohesive, but no adhesive forces.

  6. Viscosity • How much a liquid resists flowing.

  7. IMF’s affect . . . . • Surface tension • Capillary action • Beading • Viscosity

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