Phase Diagram.

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Presentation transcript:

Phase Diagram

The state of matter of a substance is dependent on 2 variables The state of matter of a substance is dependent on 2 variables. - Temperature - Pressure

You can use a Phase Diagram to determine the state of matter of a substance, depending on it’s temperature and pressure.

Typical Phase Diagram

Important Parts of the Phase Diagram

Melting Curve – shows the pressure and temperature that a solid becomes a liquid and visa versa.

Vapor Curve – shows the pressure and temperature that a liquid becomes a gas and visa versa.

Sublimation Curve – shows the pressure and temperature that a solid becomes a gas and visa versa.

Triple Point – is the temperature and pressure where all 3 phases of matter can coexist.

Critical Point – occurs under conditions at which no phase boundaries exist.

Phases Diagram for H2O At 1 atm H2O melts at 0oC and boils at 100oC.

What state of matter would the following substance be under the following conditions?

Temp. = - 20oC Press. = 100atm

Temp. = -70oC Press. = 1000atm

Temp. = 0oC Press. = 1atm

What phase change would occur under the following conditions?

Temp. = -20 Press. = 1 atm to 100 atm

Temp. = 10 Press. = 100 atm to 10,000 atm

Temp. = -70 Press. = 1 atm to 10 atm

Temp. = -20 Press. = 5000 atm to 1 atm

Temp. = -100 to -60 Press. = 1 atm

Temp. = -60 to -40 Press. = 100 atm

Temp. = -50 to 0 Press. = 10 atm

On the bottom of your notes answer the following questions.

What state of matter would you have at a temp What state of matter would you have at a temp. of 200oC and a pressure of 0.50 atm?

What state of matter would you have at a temp What state of matter would you have at a temp. of 400oC and a pressure of 1.50 atm?

What state of matter would you have at a temp What state of matter would you have at a temp. of 100oC and a pressure of 2.0 atm?

What phase change would occur if the temp What phase change would occur if the temp. was a constant 300oC and the pressure decreased from 1.25 to 0.5 atm?

What phase change would occur if the pressure was a constant 1 What phase change would occur if the pressure was a constant 1.25 atm and the temp. increased from 0 to 800oC?

What temperature and pressure can all 3 phases exist at once?

Use the information you just got to complete the ‘Phase Diagram Practice Sheet 1213’ . Due tomorrow (10 pts.) Individual Work!!

Once finished with the worksheet: - Complete the Gizmo worksheet and quiz - Complete the Kinetic Theory and Endo/Exo. Practice Sheet and put it in the appropriate dropbox.