Question

In general, when a substance changes from a solid to a liquid,
A.
the density of the substance remains the same.
B.
the substance no longer has density since density is a property only solids have.
C.
the density of the substance decreases.
D.
the density of the substance increases.

Answer 1

The correct answer is:

C. the density of the substance decreases.

In general, when a substance changes from a solid to a liquid (melting), the structure of the molecules typically becomes less ordered and may occupy a larger volume in the liquid state compared to the solid state, leading to a decrease in density. However, there are exceptions (like ice, which is less dense than liquid water), but for most substances, the density decreases when transitioning from solid to liquid.