The postulate that molecules are in constant random motion best explains why liquids
can undergo solidification
maintain their volumes
are incompressible
have no characteristic shape
Explanation
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D. In a liquid, the particles are still in close contact, so liquids have a definite volume. However, because the particles can move about each other rather freely, a liquid has no definite shape
The postulate that molecules are in constant random motion best explains why liquids and gases have no fixed shape and take on the shape of their container
The correct answer is:
D. have no characteristic shape
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Explanation:
The postulate that molecules are in constant random motion is part of the kinetic theory of matter, which explains the behavior of particles in different states.
In liquids, the molecules are:
Closely packed (like solids), but
Not in fixed positions — they move randomly and freely past one another.
This random motion allows liquids to flow and take the shape of their container, which means they do not have a fixed (characteristic) shape, even though they maintain a definite volume.
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Summary:
Constant random motion → explains why liquids flow and lack a fixed shape.
So, the best explanation is:
D. have no characteristic shape.
@myschool, please amend rhis.
Thank you all for your contributions. The necessary correction has been made.
The postulate that molecules are in constant random motion best explains why liquids have no characteristic shape. The molecules in a liquid move freely and are not held in a fixed position, allowing liquids to flow and take the shape of the container they are in, unlike solids that have a fixed shape.
Answer: D. have no characteristic shape
The postulate that molecules are in constant random motion best explains why liquids have no characteristic shape because the molecules in a liquid are able to move freely around each other, taking on the shape of their container due to this constant movement; essentially, the fluid nature of a liquid arises from the random motion of its molecules.
Key points:
Molecular movement in liquids:
Unlike solids where molecules are tightly packed, liquid molecules have enough space to slide past each other, allowing for constant random motion.
No fixed shape:
This free movement means that a liquid takes the shape of its container, as the molecules readily adjust their positions.
