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# 8th Grade Chapter 5 Lesson 4

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For Student Use Only

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### Transcript

• 1. 8 th Grade Chapter 5 Lesson 4 Pgs. 206-218 For Student Use Only
• 2. Heat and Phase Change
• Three States of Matter:
• Solid
• Liquid
• Gas
• Changes due to a loss or gain of heat
• 3. 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
• 4. 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
• 5. 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
• 6. Heat and Phase Change
• Evaporation
• Liquids that evaporate quickly are volitile
• Liquids that evaporate slowly are involitile
• 7. 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
• 8. 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
• 9. 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
• 10. 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
• 11. Heat and Phase Change
• Evaporation and Condensation
• Heat flows from higher to lower concentration
• Refrigeration is using heat and condensation
• 12. 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
• 13. Heat and Phase Change
• Sublimation:
• A gas changing directly into a solid
• 4 th State of Matter:
• Plasma- super heated gas