Question

 

 

The triple point of water is 0.0098ºC at 0.00603 atm (4.58 torr). At the triple point, ice, water, and water vapor exist in equilibrium with each other.

 

Complete the following sentences to identify the process that ice, water, or water vapor may undergo if either the temperature or the pressure is increased.

Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

 

FREEZE 1. If ice is heated at a constant pressure of 0.00512 atm, it will_____________.

CONDENSE 2. If ice is heated at a constant pressure of 1 atm, it will_____________.

MELT 3. If the pressure of water vapor is increased at a constant pressure of 100 degrees Celsius,it will____.

SUBLIME 4. If the pressure of water vapor is increased at a constant pressure of -50 degrees Celsius,it will__.

VAPORIZE

DEPOSIT

 

 

Answer 1

Concepts and reason

In the given phase diagram, locate the point corresponding to the given temperature and pressure and determine the region in which this point lies, that is the phase in which carbon dioxide exists at these conditions.

To find the phase transition happening on decreasing pressure, move from the located point along the decreasing pressure.

Fundamentals

Phase diagram is a graphical representation of variation of temperature with pressure for various phases of a substance. The graph has temperature on x-axis and pressure on y-axis.

Consider the phase diagram for a one component system given below:

In the given phase diagram,

Point A represents the triple point, where all the three phases exist together.

At point D only solid phase exists.

At point E only liquid phase exists.

At point F only gas phase exists.

Line AC represents phase transition from solid to liquid and vice versa at different temperatures and pressure. Therefore, this line represents the melting and freezing process.

Line AB represents phase transition from gas to liquid and vice versa at different temperatures and pressure. Therefore, this line represents the vaporization and condensation process.

Line AO represents phase transition from solid to gas and vice versa at different temperatures and pressure. Therefore, this line represents the sublimation and deposition process.

At and , the substance exists in solid phase at point D.

When ice is heated at a constant pressure of , it changes from solid phase to gas phase. Therefore, ice sublimes.

When ice is heated at a constant pressure of , it changes from solid phase to liquid phase. Therefore, ice melts.

When the pressure of water vapor is increased at a constant temperature of , it changes from gas phase to liquid phase. Therefore, ice condenses.

When the pressure of water vapor is increased at a constant temperature of , it changes from gas phase to solid phase. Therefore, it will deposit.

Ans:

On heating ice at a constant pressure of , it will sublime.

On heating ice at a constant pressure of , it will melt.

On increasing the pressure of water vapor at a constant temperature of , it will condense.

On increasing the pressure of water vapor at a constant temperature of , it will deposit.