Question

Which row correctly describes the ordering and motion of the molecules in liquid water and in ice when both are at a temperature of ${0^ \circ }C$?

A. Ordering: a regular pattern of molecules in ice but not in water; motion: molecules in both ice and water have the same average speed
B. Ordering: a regular pattern of molecules in ice but not in water; motion: molecules in ice travel more slowly than those in water
C. Ordering: a regular pattern of molecules in both ice and water; motion: molecules in ice travel more slowly than those in water
D. Ordering: motion a regular pattern of molecules in both ice and water; motion: molecules in both ice and water have the same average speed

Answer 1

This question explains the crystalline structure of water in both states [solid and liquid] as a state matter.

Complete step by step answer: Ice is a solid whereas water is a liquid. The atoms in solids are tightly packed and atoms in liquids are a bit loosely packed compared to solids.
Ice forms from water at ${0^ \circ }C$ only after it is further cooled or freezed to the extent of its latent heat. And when ice becomes water at ${0^ \circ }C$, this latent heat is given out.
Option B, which is a regular pattern of molecules in ice but not in water; molecules in ice travel more slowly than those in water, is correct because the molecules of ice are compacted or joined together unlike water with loose molecules and also crystallinity or relative solid structure is much more in ice as when compared with water with no or zero crystallinity.
The intermolecular forces binding the ice molecules together are far higher and will maintain their structure except when a more or higher force or pressure which is greater than the intermolecular force of the solid is applied on them.
Therefore, the correct option from among the options given is Option B.

Note: Molecules of solid state of matter are always bound together and require more energy to break the bonds, an applicative example is found in solid glass and liquid glass.