Chapter 10, Problem 22A

Interpretation Introduction

Interpretation: Sample of ice is slowly heated until it liquefies and then vaporises the change in the molecules needs to be explained.

Concept Introduction:Boiling is the gradual thermal transfer of a liquid that happens when a liquid is exposed to the heat, the temperature at which the liquid's vapor pressure is equal to the ambient atmosphere's pressure on the liquid.

Answer to Problem 22A

As reaching the boiling point water molecules move fast and they are able to crack the bonds which bind them tightly and they changes state from liquid to vapor.

Explanation of Solution

Water molecules are strongly bound in ice, and their movement is not significant. As heat is applied gradually, the movement of ${\text{H}}_{\text{2}}\text{O}$ molecule increases. After reaching melting point, the molecules move freely. As water heats up, the thermal energy of water molecules increases and they achieve their boiling point and move easily and rapidly.

Conclusion

The motion of the components of the substance increases with increasing thermal energy.