LAST NAME_______________________ FIRST NAME______________________ PERIOD______
CHS PHASE CHANGE HW
Phase change
Vapor or Gas
Sublimation
Constant
Melting point
Heat or Thermal
Latent Heat of
Solid
Liquid
Energy
Vaporization
Vaporization
Condensation
Melting
Freezing
Deposition
Transition
Latent Heat of Fusion
Joules
Kelvin
Definite
vibrate
Freezing point
Boiling point
Bonds
Name the process occurring during the transitions illustrated in the diagram at
left.
Letter
Transition
A
B
C
D
E
F
PHASE CHANGE – Refer to the graph at left. The data was collected as a
substance was heated at constant rate. Fill in the following.
At point A, the beginning of observations, the substance existed as a
___________. Material in this phase has _________ volume . As time
increases more __________ ____________ (or heat) is added to the
substance. This causes the molecules (or atoms) to _____________
more rapidly. We can measure this as a rise in ________________.
At point B the temperature of the substance is ______ͦC (read from the graph). This temperature is known as the
___________ ___________. The solid begins to ___________. Between points B and C the substance is in __________
so it exists both as a ___________ and a _____________. During this change __________ between the molecules or
atoms are being broken. At point C the substance is now completely transitioned into a __________. Material in this
phase has __________ volume.
The thermal energy or __________ put into the substance between points B and C converts the substance from
__________ to ___________. This is the energy required to change the substance from solid to liquid and is known as
the ____________ _________ of _________. The __________ ________ or heat put into the substance between points
A and B causes a change in the _____________.
Between points C and D the substance exists completely as a ___________ and the thermal energy or ________ added
to it causes the _____________ to increase.
When the substance reaches point D it is at the ___________ _____________ of the substance and it will start to
transition to a _________. Between D and E it will exist as both a _________ and a _________. Between points D and E
the energy is causing __________ to break and the substance to ___________ from the liquid phase to the gaseous
phase. The heat energy that causes the transition from liquid to vapor is called the ________ ________ of
____________. Beyond point E the substance exists as a __________.
Which of the substances was likely used in the experiment?
Substance
Melting Point
Bolognium
20 ͦC
WillEEum
40 ͦC
Marsium
70 ͦC
Boiling Point
100 ͦC
140 ͦC
140 ͦC
ENERGY DIAGRAM FOR PHASE CHANGES
1. Does the temperature change during melting?__________________________
2. How does the amount of energy change during melting? ________________________
3. Does the temperature change during freezing?__________________________
4. How does the amount of energy change during freezing? ________________________
5. Does the temperature change during boiling?__________________________
6. How does the amount of energy change during boiling? ________________________
7. Describe how the particle vibration changes during melting? _________________
8. Describe how the particle vibration changes during condensation? ____________
9. Which phase changes require an increase in energy _______________________
10. How would you describe the change in the arrangement of the particles in the above diagram, as heat energy
and temperature decrease?
11. What is the independent variable on the graph?_______________ dependent? _____________
Reference:
http://www.mrzimmerman.org/New%20Folder/HW/STUDY%20GUIDE%20for%20Prop%20of%20Matter.ht
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