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At the start of observations, Point A, the substance exists in the _____________state. Solid.

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Presentation on theme: "At the start of observations, Point A, the substance exists in the _____________state. Solid."— Presentation transcript:

1 At the start of observations, Point A, the substance exists in the _____________state.
Solid

2 The temperature at this point is ________________.
10oC

3 added As energy is ______________, the temperature of the substance rises at a constant rate for 2 minutes.

4 At point B, the temperature of the substance is ___________, and the solid begins to ____________.
50 oC melt

5 The temperature remains constant until the change from solid to __________ is complete.
liquid

6 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

7 Its temperature rises at a constant rate to _________.
10oC Its temperature rises at a constant rate to _________. 110oC

8 The temperature remains constant while the liquid changes to a __________.
gas

9 At Point E, the substance exists as a ____________.
gas

10 Its temperature rises ________________ as heat is added.
constantly

11 When the gaseous substance is allowed to cool, it _____________ energy.
loses

12 The cooling curve will be the reverse of the warming curve.

13 Energy will be released as the substance changes from a _________ to a __________ and also from a ________ to a ________. liquid gas liquid solid

14 The amount of heat released during condensation will be the same as the amount ___________ during vaporization. gained

15 Does the temperature increase during melting?
NO

16 Is energy required for each phase change?
YES

17 Can both liquid water and steam exist at 100 oC?
YES

18 What must be changed, temperature or heat energy, during condensation?

19 How would you describe the change in the arrangement of particles as heat energy and temperature increase? Become more spread out!!

20 Can’t happen at the same time!
What rule can you state about the relationship between phase changes and temperature? Can’t happen at the same time!

21 Heat energy is required for phase change!!
What rule can you state about the relationship between phase changes and heat energy? Heat energy is required for phase change!!

22 What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas

23 What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas

24 What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas

25 What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas

26 What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas

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

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

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

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

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

32 What is the Melting Point of this substance?
90 oC 0 oC 25 oC 90 oC 100 oC 25 oC

33 What is the Boiling Point of this substance?
90 oC 0 oC 25 oC 90 oC 100 oC 25 oC

34 Substance will change temperature. Substance will change phase.
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!!!! Substance will change temperature. Substance will change phase.

35 DT Solid Liquid Gas Melting Pt. Boiling Pt.
Is heat being added or removed??? DT DPhase Solid Liquid Gas Melting Pt. Boiling Pt.

36 DPhase DPhase

37 Boiling Pt. Melting Pt.

38 DT DT DT

39 Gas Liquid Solid

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

41 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????

42 When you add heat to something, one of two things will happen, but they will never happen at the same time!!!! Substance will change temperature. Substance will change phase.

43 Bookwork: P P


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