Different phases of water have different densities. true or false?

True

Explanation:

Indeed, different phases of water have diffferent densities.

The different phases, solid, liquid, and gas, of water are characterized by the separation of the molecules.

The density is a measure of concentration of the mass of a substance. Mathematically, density is the ratio of the mass to the volume:

A high density means a high ratio of mass to volume, and a low density means a low ratio of mass to volume.

The volume is the space occupied by the substance and the space occupied is related to the separation among the particles (atoms, molecules or ions).

Since, each state is characterized by certain separation of the particles, you can conclude that the different phases of water have different densities.

The densities of the gases are low and highly dependent on the temperature and pressure. So, the water vapor is the phase with the lowest densities.

Liquid water in the range of 5°C - 100°C has densities in the range  0.9998°C to 0.9587 g/cm³.

The density of water at 4 °C (liquid phase) is 1.000 g/cm³.

Due to the special interactions of hydrogen bonds, the density of water starts to decrease at temperatures below 4 °C ( 0.9999 g/cm³ - 0.9839 g/cm³), causing the frozen water (ice) to be less dense and float in the water.

answer: c

explanation:

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"