Question

liquid steel is less dense than solid steel because ________.○ the molecules in a liquid do not move◎ the molecules in a liquid are not as tightly packed○ a liquid can be poured○ a liquid can flow

Explanation:

Density depends on how closely particles are packed in a given volume. For most substances (including steel), when in liquid form, the molecules have more space between them (less tightly packed) than in the solid state. This means the same mass of steel occupies a larger volume as a liquid, resulting in lower density. The other options are incorrect: liquid molecules do move, and the ability to pour/flow are properties of liquids unrelated to density differences between solid and liquid steel.

Answer:

the molecules in a liquid are not as tightly packed