AP BIOLOGY

Detailed explanation-1: -As the liquid cools down, the amount of potential energy is reduced and the molecules start to move slower. When the water temperature reaches around 0°C, the molecules stick together and form a solid – ice. Even in this solid stage, the molecules are still moving – we just can’t see it.

Detailed explanation-2: -The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together.

Detailed explanation-3: -Freezing. When a liquid is cooled, the average energy of the molecules decreases. At some point, the amount of heat removed is great enough that the attractive forces between molecules draw the molecules close together, and the liquid freezes to a solid.

Detailed explanation-4: –Ice: Water molecules are locked in rigid pattern, and vibrate in their places.-Liquid water:Water molecules slide and bump past each other.-Water vapor: Water molecules move freely with much more space between them than in the liquid of solid state.