Question

when water freezes, what happens to the volume of the sample? it stays the same. it increases. it decreases.

Explanation:

Water has a unique property. When it freezes (turns from liquid to solid - ice), the hydrogen - bonding in water causes the water molecules to arrange themselves in a more open, hexagonal lattice structure. Since the molecules are more spread out in this structure compared to the liquid state (where the molecules are more closely packed in a disordered way), the volume of the sample increases.

Answer:

It increases.