SUBJECT - CHEMISTRY
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Answers
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5 a Mercury has a much greater force of cohesion than its adhesive force with glass. Therefore, the molecule of mercury at the edge are pulled inward by the inner molecules.But,the molecules do not move inward as there movement is opposed by the inner molecules.This causes 'tension' among the molecules near the edge.So, the molecules of mercury near the edge rearrange themselves so that no unbalanced force acting upon the molecules of mercury.In doing so, they take a spherical shape.
5 b because the force of cohesion of water is far less than the force of adhesion between the molecules of water and the glass top
6 a the curved upper surface of a liquid in a tube.
a lens that is convex on one side and concave on the other.
"a meniscus lens"
6 b water case
A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container. This occurs withwater and a glass tube. A convexmeniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.
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Answers
5 a Mercury has a much greater force of cohesion than its adhesive force with glass. Therefore, the molecule of mercury at the edge are pulled inward by the inner molecules.But,the molecules do not move inward as there movement is opposed by the inner molecules.This causes 'tension' among the molecules near the edge.So, the molecules of mercury near the edge rearrange themselves so that no unbalanced force acting upon the molecules of mercury.In doing so, they take a spherical shape.
5 b because the force of cohesion of water is far less than the force of adhesion between the molecules of water and the glass top
6 a the curved upper surface of a liquid in a tube.
a lens that is convex on one side and concave on the other.
"a meniscus lens"
6 b water case
A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container. This occurs withwater and a glass tube. A convexmeniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.