1. In order to be SUCCESSFUL in this unit, I need to be able to…..
Identify Pressure and Temperature Conditions at STP.
Explain how ENDOthermic and EXOthermic Reactions are different.
Read a PHASE DIAGRAM.
Remember that particles of S, L, G are in constant motion.
Know how a change in energy impacts molecule movement.

2. Standard Temperature & Pressure (STP) is defined as:

3. Condensation Vaporization Sublimation Freezing Deposition Melting
Remember…..
Exo or Endo??
Condensation Vaporization Sublimation
Freezing Deposition Melting
Vaporization
Melting
Sublimation
Condensation
Freezing
Deposition

4. A PHASE DIAGRAM is a graphical way to depict the effects of TEMPERATURE & PRESSURE on the phase of a substance.
WRITE DOWN TWO OBSERVATIONS YOU MAKE ABOUT THE GRAPH. WHAT KIND OF INFORMATION DOES IT TELL YOU??
SHARE YOUR OBSERVATIONS WITH YOUR TEAM. EACH PERSON NEEDS TO SHARE AT LEAST ONE IDEA BY WRITING IT DOWN ON THE BOARD.
SELECT ONE IDEA FROM YOUR GROUP. EACH PERSON NEEDS TO BE PREPARED TO SHARE. THERE’S NO TELLING WHO I’LL ASK TO SHARE.

5. The CURVES indicate the conditions of TEMPERATURE & PRESSURE under which “EQUILIBRIUM” between different phases of a substance can exist. TWO phases exist on these lines
In your group, identify which phases occur along each line…
Line AB = _____________________
Line BD = _____________________
Line BC = _____________________
Discuss with your partners:
Along these lines, two different phases occur at the same time. Is it possible for there to ever be three phases present at the same time?
BE PREPARED TO SHARE.

6. MELTING/FREEZING Any POINT on this line (Pressure and Temperature) the substance is BOTH Solid & Liquid
MELTING
FREEZING

7. Sublimation/Deposition Any POINT on this line (Pressure and Temperature) the substance is BOTH Solid & Gas
SUBLIMATION
DEPOSITION

8. VAPORIZATION/CONDENSATION Any POINT on this line (Pressure and Temperature) the substance is BOTH Liquid & Gas
VAPORIZATION
CONDENSATION

9. Rally Robin
With your group, discuss the following:
3- What are the THREE possible phase combinations that can occur along phase diagram lines.
2- What are TWO different types of reactions? How are they different?
1- Identify the temperature and pressure conditions at STP.

10. The vapor pressure curve ends at the CRITICAL POINT.
The temperature at which gas
cannot be liquified, no matter how
much pressure is applied.
Any substance beyond this point
is called SUPERCRITICAL FLUID.

11. The TRIPLE POINT is the condition of temperature and pressure where all THREE phases exist in equilibrium
Solid
Liquid
Gas