Thermal Energy - Physical Science by malj

VIEWS: 45 PAGES: 43

									At the start of observations, Point A, the
substance exists in the
  Solid
_____________state.
The temperature at this point is
  10oC
________________.
                added
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
added.
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?
Become more spread out!!
 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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