Phase Change Diagrams

Phase Diagrams

•Show the equilibria pressure- temperature relationship among the different phases of a given substance

Multiple Choice

What is the normal freezing point of this substance?

• 100 C

• 400 C

• 0 C

• 500 C

Multiple Choice

What is the normal boiling point of this substance?

• 100 C

• 325 C

• 400 C

Fill in the Blank

What are the values for temperature and pressure at STP?

Multiple Choice

What is the phase (s,l,g) of a substance at 2.0 atm and 100 C?

• Solid

• Liquid

• Gas

Multiple Choice

What is the phase (s,l,g) of a substance at 0.75 and 100C?

• Solid

• Liquid

• Gas

Multiple Choice

What is the phase (s,l,g) of a substance at 0.5 atm and 100 C?

• Solid

• Liquid

• Gas

Multiple Choice

What is the phase (s,l,g) of a substance at 1.5 atm and 50 C?

• Solid

• Liquid

• Gas

Multiple Choice

What is the phase (s,l,g) of a substance at 1.5 atm and 800 C?

• Solid

• Liquid

• Gas

Fill in the Blank

What are the conditions of this substance at the triple point?

Multiple Choice

If a quantity of this substance was at an inital pressure of 1.25 atm and a temperature of 300 C and was lowered to a pressure of 0.25 atm, What phase transition(s) would occur?

• freezing

• melting

• evaporation

• condensation

• sublimation

Multiple Choice

If a quantity of this substance was at an intial pressure of 1.25 atm and a temperature of 0 C was lowered to a pressure of 0.25 atm, what phase transition(s) would occur?

• Melting

• Freezing

• sublimation

• deposition

Fill in the Blank

If this substance was at a pressure of 2.0 atm, at what temperature would it melt?

Multiple Choice

If this substance was a t a pressure of 2.0 atm, at what temperature would it boil?

• 800 C

• Would not boil

Fill in the Blank

At what pressure would it be possible to find this substance in the gas, liquid, and solid phase?

Fill in the Blank

At what temperature do the gas and liquid phases become indistinguishable from each other?

Heating Curve

Multiple Choice

Which line segment represents the solid state?

• A-B

• C-D

• B-C

• D-E

Multiple Choice

Melting and Freezing happen at the same temperature

• True

• False

Multiple Choice

What is the boiling point of this substance?

• 100 C

• 80 C

• 60 C

• 20 C