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Heat Energy and Changes of State and Earth’s Energy Supply

Heat Energy and Changes of State and Earth’s Energy Supply. Types of Change of State *Note: Properties of water on ESRT page 1. It takes much more energy to go from liquid->gas or gas->liquid than from solid ->liquid or liquid ->solid. Stored Heat and Changes of State.

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Heat Energy and Changes of State and Earth’s Energy Supply

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  1. Heat Energy and Changes of Stateand Earth’s Energy Supply

  2. Types of Change of State*Note: Properties of water on ESRT page 1

  3. It takes much more energy to go from liquid->gas or gas->liquid than from solid ->liquid or liquid ->solid

  4. Stored Heat and Changes of State • A material’s temperature rises as heat is added to it unless the material is in the process of changing state, then the temperature will remain the same as it is heated A cheesy 80s video to help explain the concept • EUREKA!!!

  5. Stored Heat and Changes of State of Water • Freezing point of water= 0 degrees C • Boiling point of water= 100 degrees C • When water reaches 0 degrees C or 100 degrees C, it will remain at that temperature for a period of time during the change in state • This is due to the fact that the heat that is being added is being changed to stored heat (potential energy)

  6. Earth’s Energy Supply • MEMORY JOGGER: The energy for Earth’s processes comes from mostly the sun but also Earth’s interior

  7. Solar Energy • Earth receives electromagnetic energy of varying wavelengths from the sun • Solar energy is produced by nuclear fusion (see notes on the sun in the astronomy unit)

  8. Earth's Own Energy • Heat energy from Earth’s interior is converted into mechanical energy for mountain building, volcanic eruptions, plate movements and other internal movements • Nuclear decay (aka nuclear fission): the process by which unstable elements split to form lighter elements, resulting in the release of high amounts of energy • Nuclear decay is used to produce a portion of the nation’s electric supply (ie. Indian Point)

  9. EXIT PASS • In groups of 3-4… • Write ONLY the process. Be sure all names are on your paper • Determine the change in state occurring in each of these examples: • Example: Water turning into ice: liquid->solid (solidification) a. Dew on a car window b. A pot of water on a counter going from a level of 2 liters to a level of 1 liter in a period of 3 days c. A smoke machine at a dance d. Breathing on a mirror and fogging it up

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