Question

The density of a liquid form of a material is always less than the density of the solid form of that same material true or false

Answer 1

Almost always true. H2O is the exception as water is more dense than ice.

Answer 2

Answer:

False

Explanation:

This property depends on the intermolecular interactions of the analyzed compound.

In most cases, this property is fulfilled, but one of the most important exceptions is water since ice cubes float in liquid water which means that its density is lower than that of liquid water.

This is due to one of the types of bonds that binds hydrogen bonds to water molecules.

Hydrogen bridges are a molecular interaction that occurs between the hydrogen in one molecule of water and the oxygen in another molecule.

Recall the formula of the density

$d=\frac{m}{v}$

The volume is inversely proportional to the density this means that the lower the volume the higher the density and the higher the volume the lower the density.

This type of bonding means that when the $H_2O$ freezes there is more space between the molecules, then they occupy a larger volume

Therefore, if we have the same mass in the liquid state and the solid-state, the molecules in the liquid state will be closer together occupying less volume (higher density) and the molecules that are in the solid-state occupy a greater volume (lower density)