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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.