Jeopardy review for heat ch 1
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Jeopardy review for heat ch 1

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Jeopardy review for heat ch 1 Presentation Transcript

  • 1. I’m so hot Chill out, man Counting Calories Going through a phase I’m not a category 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5
  • 2. I’m So Hot 1 • Heat is what form of energy?
  • 3. I’m so Hot 1 • Kinetic
  • 4. I’m So Hot 2 • Heat is measured in what units? (name 2)
  • 5. I’m so Hot 2 • Calories or Joules
  • 6. I’m so Hot 3 • If you paint a thermos bottle silver on the outside, what type of heat transfer are you trying to reduce? Why/how?
  • 7. I’m So Hot 3 • Radiation: to reflect it
  • 8. I’m So Hot 4 Why is the water cooler at the bottom of the lake in the summer? What form of heat transfer is related to this?
  • 9. I’m so Hot 4 • Fluids that are cool are dense and sink to the bottom of their containers. This drives convection
  • 10. I’m so Hot 5 • Does the pressure of the air in car tires change as you drive? If so, does it go up or down and why would it?
  • 11. I’m so Hot 5 • Goes up. Friction with road causes heating of air in tires which increases the pressure.
  • 12. Chill Out, Man 1 • The cold temperature of -200 degrees Celsius equals what on the Kelvin scale?
  • 13. Chill Out, Man 1 • 73 Kelvin
  • 14. Chill Out, Man 2 • If you want to freeze 20 mL of water, how many calories do you need to remove from the water if it’s at 0 deg C?
  • 15. Chill Out, Man 2 • 20 g * 80 cal/g = 1600 cal
  • 16. Chill Out, Man 3 • A 10 g piece of glass gets cooled from 30 degrees C down to 20 degrees C. Its specific heat is .20 cal/g*degrees C. How much heat was lost by the glass?
  • 17. Chill Out, Man 3 • 10 g * (-10 °C) * .2 cal/g °C)= - 20 cal
  • 18. Chill Out, Man 4 • Which would be better to use for cooking a big pot of pasta sauce: A Steel or copper pot? • Defend your answer. • Hint: You cook it for a long time but don’t want to burn the bottom of the sauce.
  • 19. Chill Out, Man 4 • Iron.
  • 20. Chill Out, Man 5 • Use the word “insulate” to explain why it is so difficult for scientists to make a substance reach absolute zero.
  • 21. Chill Out, Man 5 Heat always manages to get into the substance. It’s really difficult to insulate heat from getting through to the experiment.
  • 22. Counting Calories 1 • A chemical reaction takes place in a calorimeter. The following data are obtained: • Mass of water: 500 g • Initial Temp of water: 30 degrees C • Final Temp of water: 45 degrees C
  • 23. Counting Calories 1 • 7500 cal
  • 24. Counting Calories 2 • Where does the word “calorie” come from?
  • 25. Counting Calories 2 • Scientists originally thought heat was an invisible fluid called “caloric”
  • 26. Counting Calories 3 • What is the specific heat of water?
  • 27. Counting Calories 3 • 1 cal/g °c
  • 28. Counting Calories 4 True or false: A thermometer measures calories.
  • 29. Counting Calories 4 • False
  • 30. Counting Calories 5 • A Big Mac with 550 Calories is how many calories?
  • 31. Counting Calories 5 • 550,000 calories
  • 32. Going through a phase1 • Gases ________when heated and ______when cooled.
  • 33. Going through a phase 1 • expand • contract
  • 34. Going through a phase 2 • If you skip going from a solid and go straight to a gas, it’s called:___________ • The opposite is called:_________________
  • 35. Going through a phase 2 • Sublimation • deposition
  • 36. Going through a phase 3 • The heat you have to add to water at its boiling point in order to get it to turn into a gas is known as _______________ • Its value is: ____________
  • 37. Going through a phase 3 • Heat of vaporization • 540 cal/gram
  • 38. Going through a phase 4 • Answer 3 a b c d and e on page 39 in text.
  • 39. Going through a phase 4 • C • A and B • C has faster molecules, on average • The same • Containers B & C
  • 40. Simply working it 5 • Scissors 1st • Hockey Stick 3rd • Wheelbarrow 2nd • Pliers 1st
  • 41. Energizer Bunny 1 • List which of the five forms of energy are potential • Then, list which of the five forms of energy are kinetic
  • 42. Energizer Bunny 1 • Potential: nuclear and chemical • Kinetic: heat, electromagnetic, mechanical
  • 43. Energizer Bunny 2 • If an object has a mass of 50 kg and is moving at 2 m/s, what is its kinetic energy? • If the same object is held 3 meters high above the ground what is its gravitational potential energy?
  • 44. Energizer Bunny 2 • 100 J • 1470 J
  • 45. Energizer Bunny 3 • After the car is lifted up the first hill, a rollercoaster runs on gravity. If the energy of the coaster is equal to its starting GPE, why must the rest of the hills be lower in height than the first?
  • 46. Energizer Bunny 3 • Because of the law of conservation of energy, the coaster’s height on successive hills can never be higher than the starting, otherwise, it would be gaining energy. • In fact, it loses a lot of energy as noise and heat due to friction as it travels: requiring even lower hills later
  • 47. Energizer Bunny 4 • Describe an energy conversion that involves turning mechanical energy into heat.
  • 48. Energizer Bunny 4 • Rubbing hands
  • 49. Energizer Bunny 5 • If a ball is thrown upward into the air at a release height of 2 meters, goes up, then falls back to earth, its speed at its starting height is: • A) greater than the speed thrown at (because of gravity) • B)less than the speed thrown at (because of friction • C) equal to the speed thrown at (just because)
  • 50. Energizer Bunny 5 • C: KE at that height is equal (what you put into system is what you get out…..energy is conserved.)