Which point represents a liquid-vapor equilibrium in this phase diagram A B C D

Question

Which point represents a liquid-vapor equilibrium in this phase diagram A B C D ________ A gas or a vapor may be liquefied only at temperatures equal to the boiling point at or below the normal boiling point above the normal boiling point at or below the critical temperature ______Which substance meets the requirements: cubic solid; poor electrical conductor in the solid state; good conductor when melted Sodium chloride sulfur diamond chromium ________ The stronger the intermodular forces in substance the lower the boiling point the higher the boiling point the higher the vapor pressure the smaller the deviation from ideal gas behavior. __________ consider this statement: carbon dioxide is more easily solidified than nitrogen because the Attractive forces (dispersion) acting between the CO_2 molecules are less than those acting Between the N_2 molecules The assertion is a correct statement ....but the reason is not correct The assertion is a false statement..

Explanation / Answer

(5). As point C lies on thelne separating the liquid phase and the vapor phase.

So, point C represents the liquid-vapor equilibrium in this phase diagram.

(6). We know that, the critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.

Thus, a gas or a vapor may be liquefied only at temperatures:

d. At or below the critical temperature.

(7). (a). Sodium Chloride. It is because Sodium Chloride exists in cubic solid. In solid state, the ions are tightly bound to each other and hence are not free to carry electrical charge making it poor conductor in solid state. On the other hand when it is melted, ions are free to move and carry electrical charge making it good conductor.

(8). The stronger the intermolecular forces in substance,

b). the higher the boiling point.

It is because strong intermolecular forces bound the atoms together tightly. So it is not easy to break the bonds and to make the substance evaporate. A high temperature is required to convert the liquid to its vapors that is high boiling point.

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