Question

At the melting point, the solid form of a substance _______ the liquid form of the substance?

1) is the same as
2) is different from
3) is less dense than
4) is more dense than

Answer 1

At the melting point, the solid form of a substance is the same as the liquid form. This occurs at a constant temperature specific to the substance, indicating that solid and liquid are the same substance in different states.

Step-by-step explanation:

At the melting point, the solid form of a substance is the same as the liquid form of the substance. When a substance reaches its melting point, the solid and the liquid phases coexist in equilibrium; the particles that compose the solid form are closely packed in an orderly structure and have only vibrational movement, while the liquid form allows the particles to move more freely. This process of transition from solid to liquid, or vice versa, occurs at a constant temperature for a given substance, signifying that the solid and liquid forms are indeed the same substance at a particular thermodynamic state.