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# 8th Grade Chapter 5 Lesson 1

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### 8th Grade Chapter 5 Lesson 1

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