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At the start of observations, Point A, the substance exists in the _____________state.
Solid
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The temperature at this point is ________________.
10oC
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added As energy is ______________, the temperature of the substance rises at a constant rate for 2 minutes.
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At point B, the temperature of the substance is ___________, and the solid begins to ____________.
50 oC melt
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The temperature remains constant until the change from solid to __________ is complete.
liquid
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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
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Its temperature rises at a constant rate to _________.
10oC Its temperature rises at a constant rate to _________. 110oC
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The temperature remains constant while the liquid changes to a __________.
gas
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At Point E, the substance exists as a ____________.
gas
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Its temperature rises ________________ as heat is added.
constantly
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When the gaseous substance is allowed to cool, it _____________ energy.
loses
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The cooling curve will be the reverse of the warming curve.
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Energy will be released as the substance changes from a _________ to a __________ and also from a ________ to a ________. liquid gas liquid solid
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The amount of heat released during condensation will be the same as the amount ___________ during vaporization. gained
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Does the temperature increase during melting?
NO
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Is energy required for each phase change?
YES
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Can both liquid water and steam exist at 100 oC?
YES
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What must be changed, temperature or heat energy, during condensation?
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How would you describe the change in the arrangement of particles as heat energy and temperature increase? Become more spread out!!
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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!
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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!!
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What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas
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What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas
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What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas
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What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas
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What phase of matter is found on the “Red” part of graph?
Solid Liquid Gas Solid and Liquid Liquid and Gas
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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
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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
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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
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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
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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
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What is the Melting Point of this substance?
90 oC 0 oC 25 oC 90 oC 100 oC 25 oC
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What is the Boiling Point of this substance?
90 oC 0 oC 25 oC 90 oC 100 oC 25 oC
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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.
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DT Solid Liquid Gas Melting Pt. Boiling Pt.
Is heat being added or removed??? DT DPhase Solid Liquid Gas Melting Pt. Boiling Pt.
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DPhase DPhase
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Boiling Pt. Melting Pt.
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DT DT DT
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Gas Liquid Solid
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DT Boiling Pt. Gas DPhase DT Liquid Melting Pt. DPhase DT Solid
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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????
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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.
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Bookwork: P P
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