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

At the start of observations, Point A, the substance exists in the _____________state. Solid. The temperature at this point is ________________. 10 o C. added. As energy is ______________, the temperature of the substance rises at a constant rate for 2 minutes.

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

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  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. 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? Heat Energy

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

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

  21. 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? • 0 oC • 25 oC • 90 oC • 100 oC 90 oC 25 oC

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

  34. When you add heat to something, one of two things will happen, but they will never happen at the same time!!!! Understand this statement and you will understand Phase Change Diagrams: • Substance will change temperature. • Substance will change phase.

  35. 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. 163 1-5 • P. 170 1-5

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