Multiple Choice
Which of the following phase changes involves an increase in the attractive force between molecules?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
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Which of the following statements is NOT true about a liquid in a glass capillary that forms a convex meniscus?
A
Mercury in a glass capillary typically forms a convex meniscus.
B
The liquid level in the capillary is lower than the surrounding liquid surface.
C
The liquid exhibits stronger cohesive forces than adhesive forces with the glass.
D
The liquid rises in the capillary due to strong adhesion to the glass.
Verified step by step guidance1
Understand the concept of meniscus formation in a capillary tube: A meniscus is the curve seen at the liquid's surface inside a container or tube, caused by the interaction between the liquid and the container's surface.
Recall that a convex meniscus curves outward (like the surface of mercury in glass), which happens when cohesive forces within the liquid are stronger than adhesive forces between the liquid and the glass.
Recognize that when a liquid forms a convex meniscus, it typically does not rise in the capillary; instead, the liquid level inside the capillary is lower than the surrounding liquid surface because the liquid is pulled down by stronger cohesion.
Contrast this with a concave meniscus (like water in glass), where adhesive forces are stronger, causing the liquid to climb up the walls and rise in the capillary tube.
Therefore, the statement 'The liquid rises in the capillary due to strong adhesion to the glass' is NOT true for a liquid forming a convex meniscus, such as mercury in glass.
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