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8th Grade Chapter 5 Lesson 1
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  • 1. Pgs. 176-185 For Student Use Only 8 th Grade Chapter 5 Lesson 1
  • 2. Question 1 What is thermal energy?
    • A. Energy of internal heat
    • C. Internal energy due to the random motions of its individual molecules
    • B. Energy of individual molecules within an object that are moving randomly
    • D. It is not mechanical energy of the whole obejct
  • 3. Key
    • 1) A,B,C,D
  • 4. Heat is everywhere
    • Student generated ideas:
    • Explain which objects would have thermal energy?
  • 5. Thermal Energy is everywhere
    • Thermal Energy
      • Thermal energy can be transferred from one object to another
      • Heat= the transfer of thermal energy from an object of higher temperature to an object of lower temperature
      • What heat does is transfer energy
    http://www.physchem.co.za/Heat/Graphics/Heat28.gif
  • 6. Heat is everywhere
    • Student generated ideas:
    • Explain which objects would move heat more quickly?
  • 7. Thermal Energy is everywhere
    • Thermal Energy
    • Heat flows from higher energy to lower energy
      • It flows no other way!!
    • Heat does not exist unless thermal energy is being transferred.
    • Temperature is the measure of kinetic energy (the more energy the faster the motion)
    http://www.physchem.co.za/Heat/Graphics/Heat28.gif
  • 8. Heat is everywhere
    • Student generated ideas:
    • Explain which properties of the objects affect thermal energy.
  • 9. Thermal Energy is everywhere
    • Factors that affect thermal energy
    • Temperature: higher temperature equal higher energy
    • Mass: the amount of matter in an object, more matter more warmth
    • Higher Heat capacity: some objects change more quickly in temperature than other objects
    http://www.chem.uiuc.edu/webFunChem/SpecificHeat/Heatplastic.gif
  • 10. Thermal Energy is everywhere
    • Factors that affect thermal energy
    • Type of substance: different substances have different heat
    • Specific Heat: is the amount of heat that added to a certain mass of a particular substance in order to raise its temperature by 1 degree
    http://www.chem.uiuc.edu/webFunChem/SpecificHeat/Heatplastic.gif
  • 11. Heat is everywhere
    • Student generated ideas:
    • Explain which temperature scale you would use for what object.
  • 12. Thermal Energy is everywhere
    • Temperature Scales:
    • Temperature is measured with a thermometer
      • Fahrenheit Scale- based on 0 which is ice, water, and salt
      • Celsius Scale- water freezes at 0 and boils at 100
      • Kelvin Scale- absolute scale- used to describe absolute zero where molecules stop moving
    http://www.visionlearning.com/library/modules/mid48/Image/VLObject-318-021121021101.gif
  • 13. Calories are everywhere
    • Student generated ideas:
    • Explain which objects would have higher calories and why you choose those objects.
    • Heat energy also does work
  • 14. Thermal Energy is everywhere
    • Calories:
    • Calorie is used to measure thermal energy and heat.
      • Food labels are in Kilocalories (one thousand calories)
    • BTU: British Thermal Unit- when one pound of water undergoes one change of 1 degree F
    • Calorimeter: this device measures thermal energy in a material
    http://www.visionlearning.com/library/modules/mid48/Image/VLObject-318-021121021101.gif
  • 15. Heat energy also does work
    • Student generated ideas:
    • Explain which objects would have energy for doing work.