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8th Grade Chapter 5 Lesson 4
 

8th Grade Chapter 5 Lesson 4

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    8th Grade Chapter 5 Lesson 4 8th Grade Chapter 5 Lesson 4 Presentation Transcript

    • 8 th Grade Chapter 5 Lesson 4 Pgs. 206-218 For Student Use Only
    • Heat and Phase Change
      • Three States of Matter:
        • Solid
        • Liquid
        • Gas
      • Changes due to a loss or gain of heat
    • Heat and Phase Change
      • Solids to Liquids= melting
        • This point is called the melting point
      • Liquid to Solid= freezing
        • This point is called the freezing point
        • Freezing point is affected by solutes
    • Heat and Phase Change
      • Latent Heat
        • Solid to liquid produces no temperature change
          • This is called latent heat
      • Heat of fusion
        • Heat required to turn a certain amount of solid into a liquid without changing temperature
    • Heat and Phase Change
      • Evaporation and Condensation
        • Evaporation- liquid to a gas
          • Factors that affect evaporation
            • Higher temperatures
            • Greater surface area
            • Air speed over a liquid
    • Heat and Phase Change
      • Evaporation
        • Liquids that evaporate quickly are volitile
        • Liquids that evaporate slowly are involitile
    • Heat and Phase Change
      • Internal Evaporation
        • Evaporation that takes place in the liquid as opposed to the usual surface
        • Requires high heat
        • This is also called boiling
          • When evaporation is throughout the liquid
          • Boiling Point- when boiling takes place
    • Heat and Phase Change
      • Boiling:
        • Evaporation will not occur any quicker above 100 degrees
      • Pressure:
        • Affects the boiling point
        • Control the pressure and control the boiling point
    • Heat and Phase Change
      • Pressure Cooker:
        • Uses pressure to make food cook faster
      • Heat of Vaporization:
        • Heat required to change a given amount of liquid into a gas without raising the temperature
    • Heat and Phase Change
      • Condensation:
        • Gas changing into a liquid
        • This happens when warm things get cold
      • Saturation Point
        • When amount of water evaporating equals the amount of condensing
    • Heat and Phase Change
      • Evaporation and Condensation
        • Heat flows from higher to lower concentration
        • Refrigeration is using heat and condensation
    • Heat and Phase Change
      • Principles of Refrigeration:
        • When a gas is compressed its temperature rises
        • When a gas is allowed to expand its temperature falls
        • When a liquid evaporates it absorbs heat from the surroundings
        • When a gas condenses is releases heat into its surroundings
    • Heat and Phase Change
      • Sublimation:
        • A gas changing directly into a solid
      • 4 th State of Matter:
        • Plasma- super heated gas