AP Chemistry : Phase Diagrams

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #1 : Phase Diagrams

What is the definition of the triple point?

Possible Answers:
None of these
The state where liquid and gas cannot be differentiated
The state where solid, liquid, and gas coexist in equilibrium
The condensation line of the phase diagram
The point in which temperature change has no effect on the substance
Correct answer: The state where solid, liquid, and gas coexist in equilibrium

Definition of triple point: where solid, liquid, and gas exist in equilibrium

Example Question #2 : Phase Diagrams

What is represented by point D

Possible Answers:


Triple point

Critical point


liquid phase

Correct answer:

Critical point


the critical point is where the solid and gas cannot be distinguished

Example Question #3 : Phase Diagrams

A solution of water is at 0.006atm and 0.01 degrees Celsius. What phase(s) are present in the sample?


Possible Answers:

Solid, liquid, and gas

Solid and gas

Liquid and gas

Liquid only

Solid and liquid

Correct answer:

Solid, liquid, and gas


The point detailed in the question is the triple point of water on the phase diagram. At the triple point all three phases of a chemical coexist; as such the correct answer is solid, liquid, and gas. 

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