Chapter 14, Problem 35R

To determine

To choose: The correct option.

Answer to Problem 35R

Option (B)

Explanation of Solution

Introduction:

The heat transfer changes the phase of the substance from solid to liquid and liquid to gas. The heat given to rise the temperature is called the specific heat and that given for phase change is called the latent heat.

The absolute zero is the temperature at which the substance changes its phase. So, the option (A) is incorrect.

The boiling point is the temperature at which the particles start escaping from the liquid surface by overcoming external pressure on the liquid surface. So, the option (B) is correct.

The melting point is the point at which the substance starts melting from solid phase. So, the option (C ) is incorrect.

The heat of fusion is the amount of the heat necessary for the phases change from solid to liquid. So, the option (D) is incorrect.

Conclusion:

Thus, the vapor pressure of the liquid becomes equal to the external pressure at boiling point of the liquid.