1. Hot Seat!

2. Thermal Energy Transfer Multiple Choice Hypothesis, Data, and Graphs True or False? More Thermal Energy 100 200 300 400 500

3. Heat travels through liquids and gasses by: ___________________. 100 Category 1

4. Heat always moves from a __________ object to a ___________ object. 200 Category 1

5. __________ is the thermal energy that flows from a material with higher temperature to one with a lower temperature. 300 Category 1

6. ___________ is the transfer of thermal energy by direct contact, from one molecule to the other. 400 Category 1

7. _____________ is the transfer of energy in the form of electromagnetic waves. 500 Category 1

8. The expansion of an object is due to the _________ in movement of molecules in matter. A. decrease B. difference C. increase D. reduction 100 Category 2

9. If the particles in an object begin to move more quickly, their average kinetic energy _________, and the object’s temperature __________. A. decreases, falls B. increases, falls C. decreases, rises D. increases, rises 200 Category 2

10. You need to put a metal bolt into a hole in a metal cylinder. It is too tight to fit in the cylinder. Which is the best strategy to make bolt fit? A. Heat the bolt and cylinder B. Cool the bolt and cylinder C. Heat the bolt and cool the cylinder D. Cool the bolt and heat the cylinder 300 Category 2

11. When placed in direct sunlight, which object will absorb the most visible light? A. a piece of glass B. a shiny mirror C. a black sweater D. a snowball 400 Category 2

12. _____________ is the increase in the size of a substance when the temperature is increased. A. thermal expansion B. kinetic fusion C diffusion D. bouyancy 500 Category 2

13. A dozen balloons popped when taken outside. Develop a hypothesis to explain what happened, using thermal energy terminology. 100 Category 3

14. A small metal cup of hot water is placed inside a larger Styrofoam cup of cold water. Temperatures were measured at the beginning and the end. What has happened to the temperature of the water in both cups at 4 1/2 minutes? 200 Category 3 1 2 3 4 5

15. A small metal cup of hot water is placed inside a larger Styrofoam cup of cold water. Temperatures were measured at the beginning and the end of 5 minutes. How was the thermal energy transferred between the 2 cups of water?. 300 Category 3

16. Is thermal energy still being transferred at the 5 minute mark? Why or why not? 400 Category 3 1 2 3 4 5

17. During energy transformation, energy is never : A. released as heat. B. used to increase an object’s potential energy. C. created or destroyed. D. completely transformed. 500 Category 3

18. True or False? Different solids do not conduct heat at the same rates. 100 Category 4

19. True or False ? Heat measures the average kinetic energy of molecules. 200 Category 4

20. True or False? When 2 substances of different temperatures are combined, they will reach a balance (equilibrium) of thermal energy over a period of time. 300 Category 4

21. True or False? The molecules in an object get smaller as it gets colder (contracts). 400 Category 4

22. True or False? One way that heat from a campfire is transferred is through radiation. 500 Category 4

23. An object’s temperature describes the average _________ __________ of an object. 100 Category 5

24. The total kinetic energy of the particles in a a sample is called _________ energy. 200 Category 5

25. How is temperature related to the speed of particles in a substance? 300 Category 5

26. The _________ Theory of Matter states that matter consists of atoms and molecules in random motion. 400 Category 5

27. Which of the following statements is true about thermal energy? A. The Sun is the only source of radiation. B. Convection takes place mostly in solids. C. When heat is transferred by conduction, particles collide, but remain in the same location. D. Convection does not occur naturally. 500 Category 5

28. Convection 100 Category 1 Answer

29. Warmer (hotter), cooler (colder) 200 Category 1 Answer

30. Heat 300 Category 1 Answer

31. Conduction 400 Category 1 Answer

32. Radiation 500 Category 1 Answer

33. C. Increase 100 Category 2 Answer

34. D. increases, rises. 200 Category 2 Answer

35. D. Cool the bolt and heat the cylinder. 300 Category 2 Answer

36. C. Black sweater 400 Category 2 Answer

37. A. Thermal Expansion 500 Category 2 Answer colder warmer

38. The balloons were blown up as much as possible, and the air outside was warmer than the air inside. When the balloons were taken outside, they heated up. The molecules inside the balloons expanded, and pushed on the inside of the balloons, until they exploded. 100 Category 3 Answer

39. 200 The water in both cups have reached the same temperature. Category 3 Answer

40. The thermal energy from the hot water has flowed to the cold water. The water inside the metal cup is now the same temperature as the water in the Styrofoam cup. 300 Category 3 Answer

41. No, there is no more transfer of thermal energy because the water in both cups are now at the same temperature, and have reached a balance or equilibrium (equal). 400 Category 3 Answer

42. C. created or destroyed. 500 Category 3 Answer

43. TRUE- Different solids conduct heat at different rates. 100 Category 4 Answer

44. False- temperature measures the average kinetic energy of molecules. 200 Category 4 Answer

45. True 300 Category 4 Answer

46. False- molecules do not change sizes, they just move more closely or further apart, depending on the temperature. 400 Category 4 Answer

47. True- one of the ways heat is transferred in a a campfire is through radiation. 500 Category 4 Answer

48. Kinetic energy 100 Category 5 Answer

49. Thermal Energy 200 Category 5 Answer

50. As the speed of particles increase, the temperature increases. 300 Category 5 Answer

51. Kinetic Theory of Matter 400 Category 5 Answer

52. C. 500 Category 5 Answer