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Heat

Heat. Chapter 10. Temperature. Measure of the average KE of particles in a substance. Adding or removing energy usually changes temperature Temperature is proportional to KE of atoms and molecules (internal energy) Ideal gases: depends only on temp

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Heat

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  1. Heat Chapter 10

  2. Temperature Measure of the average KE of particles in a substance • Adding or removing energy usually changes temperature • Temperature is proportional to KE of atoms and molecules (internal energy) • Ideal gases: depends only on temp • Gases w/2 or more atoms, liquids, solids: depends on other properties • Temperature meaningful only when stable (thermal equilibrium) • Matter expands as temperature increases

  3. Measuring Temperature TF = 9/5 TC + 32.0 Freezing Pt (Ice Pt) On Fahrenheit Scale TK = TC + 273.15 • Absolute temperature: 0 K or -273.15 Celsius • NEVER BEEN REACHED • Closest was .000 001K

  4. Assignment Pages 358-363: Read Section 10-1 Page 363 Practice Problems - odds Page 364 Section Review - ALL

  5. Which way is energy transferred in order for the apple juice and water to reach equilibrium? WARM APPLE JUICE COLD WATER

  6. HEAT: Energy is transferred between objects because of differences in temperature

  7. Thermal Equilibrium Net Energy Exchange= ZERO

  8. Low or High temperature … Doesn’t matter

  9. Conservation of Energy ΔPE + ΔKE + ΔU = 0 PEi + KEi + Ui = PEf + KEf + Uf

  10. Assignment Read Section 10-2 Practice Problems: p. 370 #1-5 Sec Rev: p. 370 #1-4

  11. Warm-Up #2 The air around the pool and the water in the pool receive the same amount of sunlight. However, the temperature of the air is higher than the temperature of the water. Why is that?

  12. Prepare for Quiz over 10-2

  13. Quiz 1 If the combined weight of the masses is 12.5kg and they fall 1.70m, how much will the internal energy of the water increase?

  14. Quiz 2 A .00450 kg object drops a distance of 47.3 m to the ground. If 57.0% of the initial potential energy goes into increasing the internal energy of the object, determine the magnitude of that increase.

  15. Warm-UpYou have a 6kg block of an unknown metal. It requires 9000J of heat to raise its temperature 3oC. • How much heat will raise it 1oC? • How much will raise 1kg of the metal 3oC? • If you applied 9000J of heat to 1kg of the metal, what would the temperature increase be? • How much heat is required to raise 1kg 1oC? 1. 3000J 2. 1500J 3. 18 oC 4. 500J

  16. Specific Heat: Amount of energy needed to raise 1kg 1oC. Energy transferred or absorbed Specific Heat at a constant pressure Either oC or K

  17. Determining Specific Heat Capacity Energy absorbed by water Energy released By Substances X “w” water “x” Substance X X

  18. Assignment PreAP: Specific Heat Worksheet Page 374 #1 ANSWER: 47 degrees Celsius

  19. Item to bring MONDAY Large coffee can Corks (5) Soup can Cashew nuts Popcorn (1 bag popped)

  20. Phase Changes Heat of vaporization (Lv) 2.26 X 106 J/kg Heat of fusion (Lf) 3.33 X 105 J/kg X 105 J/kg

  21. How much energy is removed when 10.0g of water is cooled from steam at 133.0 degrees Celsius to liquid at 53.0 degrees Celsius?

  22. Assignment PreAP Physics Practice Problems #1-5 p. 381 • 1.29 X 105 J • 2.0 X 105 J • 1.415 X 104 J • 1.354 X 107 J • 5. 76.2 degrees Celsius • Must show: • Phase change diagram • with Q’s labeled • Each Q solved for • separately • 3) Show Q’s added up • Include units • throughout work

  23. Have FRIDAY and YESTERDAY’s Homework out ready to grade

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