Phases of Matter:
Solid
matter that has definite volume and shape. The molecules are packed together tightly and move slowly.
Liquid
matter that has definite volume but not shape. Since the molecules of a liquid are loosely packed and move with greater
speed, a liquid can flow and spread.
Gas
matter that has no definite volume or shape. Molecules of a gas are so loosely arranged and move so rapidly that they will
fill their container.
Phase Change Descriptions:
Melting the change from solid to liquid.
Freezing the change from liquid to solid.
Vaporization the change from liquid to gas.
Evaporation vaporization from the surface of a liquid.
Boiling vaporization from within as well as from the surface of a liquid.
Condensation the change from gas to liquid.
Fill in the phase changes in the blanks provided.
3
4
The graph was drawn from data collected
as a substance was heated at a constant
rate. Use the graph to answer the
following questions.
At point A, the beginning of
observations, the substance exists in a
solid state. Material in this phase has
_______________ volume and
_____________ shape. With each
passing minute, _____________ is added
to the substance. At point B, the
temperature of the substance is
______°C. The solid begins to
_______________. At point C, the
substance is completely _________________ or in a ___________ state. Material in this phase has _______________ volume but not
shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a ___________ to a
___________. This heat energy is called the latent heat.
Between 9 and 13 minutes, the added energy increases the _____________________ of the substance. During the time from point D
to point E, the liquid is ___________________________. By point E, the substance is completely in the __________ phase.
Material in this phase has _____________ volume or shape. The energy put to the substance between minutes 13 and 18 converted
the substance from a ___________ to a ___________ state. This heat energy is called the latent heat. Beyond point E, the substance
is still in the ______________ phase.
Which of these three substances was likely used in this phase
change experiment ?
__________________________
Substance
Bolognium
Unobtainium
Foosium
Melting point
20 °C
40 °C
70 °C
Boiling point
100 °C
140 °C
140 °C
1. Vaporization is the change from:
a. liquid to gas.
b. solid to liquid.
c. gas to solid.
d. solid to gas to solid.
e. gas to liquid.
2. The change from gas to liquid is called:
a. boiling.
b. condensation.
c. distillation.
d. melting.
3. How many phase changes have latent heat that is gained ? _______
4. How many phase changes have latent heat that is lost ? ______
5. What are the 2 examples of the phase change from liquid to gas?
________________________________
________________________________
6. How many phases are there ? _________
7. How many phase changes did we list in the chart ? ________
Use the above graph for the following 4 questions.
8. During which interval of the graph is a phase change occurring ?
a. A to B
b. E to F
c. C to D
d. D to E
9. During which interval does water get heated ?
a. A to B
b. E to F
c. C to D
d. D to E
c. C
d. D
e. B
c. C
d. D
e. B
10. At what point does vaporization end ?
a. A
b. E
11. At what point does melting start ?
a. A
b. E
12. You cannot see water vapor.
a. true
b. false
13. List the phases from greatest to least energy.
______________________________________
_____________________________________
_______________________________________
e. sublimation.