# Thermal Energy - Physical Science by malj

VIEWS: 45 PAGES: 43

• pg 1
```									At the start of observations, Point A, the
substance exists in the
Solid
_____________state.
The temperature at this point is
10oC
________________.
As energy is ______________, the
temperature of the substance rises
at a constant rate for 2 minutes.
At point B, the temperature of the
50 oC
substance is ___________, and
the solid begins to ____________.
melt
The temperature remains constant
until the change from solid to
liquid
__________ is complete.
It has taken 3 minutes to add
enough energy to melt the solid
completely. From Point C to Point
D, the substance is in the
__________ state.
liquid
10oC

Its temperature rises at a constant
110oC
rate to _________.
The temperature remains constant
while the liquid changes to a
gas
__________.
At Point E, the substance exists as
gas
a ____________.
Its temperature rises
constantly
________________ as heat is
When the gaseous substance is
loses
allowed to cool, it _____________
energy.
The cooling curve will be the
reverse of the warming curve.
Energy will be released as the
substance changes from a
liquid
_________ to a __________ and
gas
liquid
also from a ________ to a
solid
________.
The amount of heat released
during condensation will be the
gained
same as the amount ___________
during vaporization.
Does the temperature increase during
melting?
NO
Is energy required for each phase change?

YES
Can both liquid water and steam exist at
100 oC?
YES
What must be changed, temperature or
heat energy, during condensation?
Heat Energy
How would you describe the change in the
arrangement of particles as heat energy
and temperature increase?
What rule can you state about the
relationship between phase changes and
temperature?
Can’t happen at the same time!
What rule can you state about the
relationship between phase changes and
heat energy?
Heat energy is required for
phase change!!
What phase of matter is found on
the “Red” part of graph?
A.Solid
B.Liquid
C.Gas
D.Solid and Liquid
E.Liquid and Gas
What phase of matter is found on
the “Red” part of graph?
A.Solid
B.Liquid
C.Gas
D.Solid and Liquid
E.Liquid and Gas
What phase of matter is found on
the “Red” part of graph?
A.Solid
B.Liquid
C.Gas
D.Solid and Liquid
E.Liquid and Gas
What phase of matter is found on
the “Red” part of graph?
A.Solid
B.Liquid
C.Gas
D.Solid and Liquid
E.Liquid and Gas
What phase of matter is found on
the “Red” part of graph?
A.Solid
B.Liquid
C.Gas
D.Solid and Liquid
E.Liquid and Gas
What type of change is occurring at
the “Red” part of graph?

A. DT
B. D phase
C. Both DT and D phase
D. Neither DT and D phase
What type of change is occurring at
the “Red” part of graph?

A. DT
B. D phase
C. Both DT and D phase
D. Neither DT and D phase
What type of change is occurring at
the “Red” part of graph?

A. DT
B. D phase
C. Both DT and D phase
D. Neither DT and D phase
What type of change is occurring at
the “Red” part of graph?

A. DT
B. D phase
C. Both DT and D phase
D. Neither DT and D phase
What type of change is occurring at
the “Red” part of graph?

A. DT
B. D phase
C. Both DT and D phase
D. Neither DT and D phase
What is the Melting Point of this
substance?

90 oC
A. 0 oC
B. 25 oC
C. 90 oC
25 oC                     D. 100 oC
What is the Boiling Point of this
substance?

90 oC
A. 0 oC
B. 25 oC
C. 90 oC
25 oC                      D. 100 oC
Understand this statement and you will
understand Phase Change Diagrams:

When you add heat to something, one
of two things will happen, but they will
never happen at the same time!!!!

1. Substance will change temperature.
2. Substance will change phase.
Is heat being added or removed???

DT
DPhase
Solid
Liquid
Gas
Melting Pt.
Boiling Pt.
DPhase

DPhase
Boiling Pt.

Melting Pt.
DT

DT

DT
Gas

Liquid

Solid
DT
Boiling Pt.
Gas
DPhase

DT
Melting Pt.                Liquid

DPhase

DT
Solid
If you take a block of ice at
-25  oC and place it on a stove

which is turned on high(which
is adding heat at a constant
rate, what happens????

ARE YOU SURE????
When you add heat to something, one
of two things will happen, but they will
never happen at the same time!!!!

1. Substance will change temperature.
2. Substance will change phase.
Bookwork:
•P. 163 1-5
•P. 170 1-5

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