3. (C) On the basis of molecular theory, explain why a liquid can flow and it needs a vessel to contain.

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Solution

In comparison to solids, liquid molecules have more kinetic energy and intermolecular spaces.
As a result, molecules can move around in the liquid.
As a consequence, liquids have a defined volume but no defined shape.
They have the ability to flow and always take the shape of the vessel in which they are contained.
Hence, a liquid can flow and it needs a vessel to contain.

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