43
At the start of observations, Point A, the substance exists in the _____________state. Solid
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At the start of observations, Point A, the substance exists in the _____________state.Solid
The temperature at this point is ________________.10oC
As energy is ______________, the temperature of the substance rises at a constant rate for 2 minutes.
added
At point B, the temperature of the substance is ___________, and the solid begins to ____________. melt
50 oC
The temperature remains constant until the change from solid to __________ is complete.liquid
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
Its temperature rises at a constant rate to _________.110oC
10oC
The temperature remains constant while the liquid changes to a __________. gas
At Point E, the substance exists as a ____________.gas
Its temperature rises ________________ as heat is added.
constantly
When the gaseous substance is allowed to cool, it _____________ energy.
loses
The cooling curve will be the reverse of the warming curve.
Energy will be released as the substance changes from a _________ to a __________ and also from a ________ to a ________.
gas liquid
liquidsolid
The amount of heat released during condensation will be the same as the amount ___________ during vaporization.
gained
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.SolidB.LiquidC.GasD.Solid and LiquidE.Liquid and Gas
What phase of matter is found on the “Red” part of graph?
A.SolidB.LiquidC.GasD.Solid and LiquidE.Liquid and Gas
What phase of matter is found on the “Red” part of graph?
A.SolidB.LiquidC.GasD.Solid and LiquidE.Liquid and Gas
What phase of matter is found on the “Red” part of graph?
A.SolidB.LiquidC.GasD.Solid and LiquidE.Liquid and Gas
What phase of matter is found on the “Red” part of graph?
A.SolidB.LiquidC.GasD.Solid and LiquidE.Liquid and Gas
What type of change is occurring at the “Red” part of graph?
A. TB. phaseC. Both T and phase D. Neither T and phase
What type of change is occurring at the “Red” part of graph?
A. TB. phaseC. Both T and phase D. Neither T and phase
What type of change is occurring at the “Red” part of graph?
A. TB. phaseC. Both T and phase D. Neither T and phase
What type of change is occurring at the “Red” part of graph?
A. TB. phaseC. Both T and phase D. Neither T and phase
What type of change is occurring at the “Red” part of graph?
A. TB. phaseC. Both T and phase D. Neither T and phase
What is the Melting Point of this substance?
A. 0 oCB. 25 oCC. 90 oCD. 100 oC25 oC
90 oC
What is the Boiling Point of this substance?
A. 0 oCB. 25 oCC. 90 oCD. 100 oC25 oC
90 oC
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.
Understand this statement and you will understand Phase Change Diagrams:
TPhase
Solid Liquid Gas
Melting Pt. Boiling Pt.
Is heat being added or removed???
Phase
Phase
Melting Pt.
Boiling Pt.
T
T
T
Solid
Liquid
Gas
Phase
Phase
T
T
T
Solid
Liquid
GasBoiling Pt.
Melting Pt.
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
