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Important Terms & Notes

Important Terms & Notes. Feb. 27-28, 2014. Energy Flow During Phase Changes of Matter. Energy must be ABSORBED by matter when the phase changes from: Solid to Liquid and Liquid to Vapor. Energy must be RELEASED by matter when the phase changes from:

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Important Terms & Notes

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  1. Important Terms & Notes Feb. 27-28, 2014

  2. Energy Flow During Phase Changes of Matter • Energy must be ABSORBED by matter when the phase changes from: • Solid to Liquid and Liquid to Vapor. • Energy must be RELEASED by matter when the phase changes from: • Vapor to Liquid and Liquid to Solid.

  3. Heat of Vaporization • The amount of heat required to change the phase of 1 gram of a substance in liquid form into 1 gram of vapor. Q = mL • For H20: L = 540 cal/g

  4. Heat of Fusion • The amount of heat given up to change the phase of 1 gram of a substance in liquid form into 1 gram of solid form (crystal/ice). Q = mL • For H20: L = 80 cal/g

  5. Heat Diagram of H2O

  6. Heat Diagram of H2O

  7. Heat Diagram of H2O

  8. Phase Change Diagram of H2O

  9. Questions Regarding the Phase Diagram • 1. The phase of water present along "Leg A" of the diagram is: •  ?    vapor •  ? solid • ?Liquid • 2. The phase change taking place, in the right-to-left direction, along Leg "B" is: •   ?    melting •   ?    boiling •   ?    freezing

  10. Questions Regarding the Phase Diagram • 3. According to the diagram, during a phase change the temperature: •   ?    increases •   ?    remains constant •   ?    Fluctuates • ?    decreases • 4. At normal atmospheric pressure, water boils at: •   ?    100 ºC •   ?    0 ºC •   ?    -20 ºC •   ?    120 ºC

  11. Questions Regarding the Phase Diagram • 5. The phase of water present along "Leg E" of the diagram is: •   ?    solid •   ?    vapor •   ?    liquid • 6. According to the diagram, freezing requires •   ?    absorption of energy •   ?    no energy change •   ?    removal of energy

  12. The Refrigeration Cycle

  13. Energy Interchange in a Refrigerator’s Cooling Cycle • Heat is taken in from the inner compartment as the Refrigerant (liquid) evaporates in the pipes (Evaporator) and changes phase to vapor. • The vapor is compressed and then pumped through a heat exchanger pipe assembly (Condenser) where heat is given up to the outside environment allowing the vapor to condense into liquid.

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