What is the molecular basis of surface tension? Your explanation for molecular b

Question

What is the molecular basis of surface tension? Your explanation for molecular base of surface tension in water: Explain the shape of the water or mercury meniscus in glass. Your explanation for observation in A (concave) Your explanation for observation in B (convex): Why the syrup moves more readily when it is heated up? Your explanation The van der walls forces in bilayers. Forces arise due to dipole-dipole interactions (induced/permanent) between the molecules of bilayers. Define two types of intermolecular forces in the polar region and one type in the non-polar region:

Explanation / Answer

7a.Surface tesnion is due to electromagnetic forces between the molecules, theses forces may be cohesive forces ( attractive forces between same )and adhesive forces (attractive force between different molecules). The molecules in the surface film of liquid experiences downward force with maximum downward force on the molecules surface. Due to this downward force the surface of the liquid behaves like stretched elastic membrane which is surface tension.

7b) When liquid is in container, its meniscus has concave shape because water wets the surface and creeps up the side.

Mercury donot wet glass, the cohesive forces within drop are stronger than the adhesive forces between the drop of glass. when liquid mercury is confined in a tube, its meniscus has convex shape because the cohesive force in liquid mercury tends to draw into a drop.

7c) The Viscosity of fluid measure its resistance to flow, by which it opposes the relative motion between layers which are moving with different velocities. As the temperature increases viscosity decreases liquid move more rapidly.

7d)

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