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Bell Ringer

Bell Ringer. Name: 2/11/2009 What nice restaurant could Mr. Z take his date to, if he was broke? Response. Quiz. If you have a question, walk up to the front desk and ask. Place quiz in basket when completed. Work on homework assignment or concept map if you finish early.

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Bell Ringer

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  1. Bell Ringer Name: 2/11/2009 What nice restaurant could Mr. Z take his date to, if he was broke? Response

  2. Quiz • If you have a question, walk up to the front desk and ask. • Place quiz in basket when completed. • Work on homework assignment or concept map if you finish early. • No talking during or after quiz until everyone is finished.

  3. Concept Map wrap-up Any questions from the concept map activity?

  4. Chapter 21 Homework Homework – due Tuesday (2/17/09) • Review Questions 2, 5, 10, 11 & 16 • Plug & Chug 20, 22 • Think & Explain 26, 37, 44 • Extra Credit Mr. Z’s automobile produces a maximum of 180 horsepower. How many calories is that per second? See page 645

  5. Heat • Heat – Energy that transfers from one object to another

  6. Heat Since energy is being transferred between objects, as heat, it’s reasonable to believe that a change is occurring in both objects! • One object loses energy • One object gains energy What happens when the energy exchange between two objects stops?

  7. Heat Thermal Equilibrium is reached.

  8. Heat Measurement How do we compare the way two different substances exchange energy?

  9. Heat Measurement Scientists needed derive a standard to use for measuring heat. Nicolas Clément published definition in 1824.

  10. Heat Measurement • calorie – standard unit of heat measurement; amount of heat required to raise the temperature of 1 gram of water by 1 degree Celsius

  11. Heat Measurement • 1 calorie = 4.184 Joules • 1 Calorie = 1000 calories = 1 kilocalorie

  12. Heat Measurement Dimensional Analysis 2000 Calories of food intake per day

  13. Heat Measurement Practical knowledge for problems

  14. Specific Heat Different object heat up and cool down at different rates. Think of a trip to the beach. You arrive at 8am. You walk in bare feet from your car, through the concrete parking lot, over an asphalt path, through the sand and into the water. What does this short trip feel like on the bottoms of your bare feet?

  15. Specific Heat Your feet feel a noticeable difference in temperature between your skin and the various materials. Now make the trip from the water to your car at 3pm in the afternoon. What is the difference?

  16. Specific Heat You feel temperature differences of different sorts in different places! Specific heat capacity is the ability to retain or lose heat given the same mass of a substance.

  17. Specific Heat Which substance absorbs energy the quickest? the slowest?

  18. Specific Heat

  19. Specific Heat #21 A 30-gram piece of iron is heated to and then dropped into cool water where the iron’s temperature drops to . How many calories does it lose to the water? (the specific heat of iron is )

  20. Specific Heat

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