Notes on the Changes of State & Phases
Name
Describe what it takes to be in a phase Equilibrium exists only when …
Le Châtelier’s principle states that if a system at equilibrium is subjected to stress, the equilibrium is shifted in
the direction that tends to relieve the stress.
Explain how a glass of ice-water sitting in the hot summer sun illustrates equilibrium
Vapor pressure exists in a can of un-opened soda pop especially after it has been shaken or warmed.
What is vapor pressure?
Why do you need a liquid to have vapor pressure?
List factors that effect the shift of equilibrium
between the evaporation and condensation of molecules in a closed container.
Favoring Evaporation (Gas molecules)
Favoring Condensation (Liquid molecules)
From the Visual Concepts Demo 
From the Visual Concepts Demo 
List the factors
What are the three main factors that effect equilibrium?
Explain the effect
What do Acetone (Nail Polish Remover), Gasoline, and Sweat all have in common? …
They are all Volatile liquids.
A Volatile liquid is different from non-volatile liquid because the volatile liquid will ….
Is Evaporation the same as Boiling? Explain.
A Boiling Curve for water is a graph comparing which two variables?
_____________ ___________
On a Phase Diagram for Water the Normal Boiling Point of H2O exists at a pressure of ____ Atm & ____ C
On a Phase Diagram for Water the Normal Freezing Point of H2O exists at a pressure of ___ Atm & ____ C
Pressure
in Torr
Diethyl ether
200
Ethanol
200
Water
200
The six possible Changes of State
Name of Phase change
Original Phase  New Phase
Real life example
1)
2)
3)
4)
5)
6)
Using the Boiling Curve on page 344 of your book determine
the temperature at which the following molecules will boil as
the pressure changes.
Molecule
Define the following (Pg 347)
Phase Diagram
Triple Point 
Critical Point 
Critical Temperature 
Critical Pressure 
Use the phase diagram for water in your book to complete the table.(pg 389)
a)
b)
c)
d)
e)
f)
g)
Pressure (atm)
0.0045
0.870
125.0
90.5
0.0020
200.0
Temperature (C)
0.005
15.5
–1.5
385.0
125.0
100.1
Phase
Vapor (gas)
Liquid
Solid
Boiling
Temperature