Question

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

Answer 1

When a substance changes from a solid to a liquid, the density of the substance typically **decreases**. This is because, in most cases, solids are more densely packed than their liquid counterparts due to the intermolecular forces and structured arrangements in solids. As the substance transitions to a liquid, the molecules move apart slightly, leading to a decrease in density.

Thus, the correct answer is:
**D. the density of the substance decreases.**