1. TEMPERATURE AND HEAT TRANSFER REVIEW

2. HEAT ENERGY REVIEW
You have a black cat and white cat. Which is more likely to absorb less heat energy?

3. HEAT ENERGY REVIEW
White cat because it is a lighter color. Dark colors absorb heat better while light colors reflect more heat energy.

4. HEAT ENERGY REVIEW
Describe how an egg may be cooked when heat is transferred by conduction.

5. The egg is cracked into a pan
The egg is cracked into a pan. The egg is in direct contact with the heated surface of pan and the heat travels through the egg.

6. By which method is heat being transferred in a refrigerator
By which method is heat being transferred in a refrigerator? Explain your choice.

7. answer
Convection; heat is moving from one part of refrigerator to another by moving with the heated and cooled air. the colder air created below the freezer becomes dense and sinks into lower portion of ‘fridge. Warmer air from below rises up to top.

8. HEAT ENERGY REVIEW
Identify which has a higher kinetic energy. Explain how you know.
A pot of boiling water or a tub of cold water.

9. HEAT ENERGY REVIEW
The pot of boiling water has more KE because the molecules are moving faster. Temperature measures the KE of the molecules.

10. HEAT ENERGY REVIEW
Describe how an egg may be cooked when heat is transferred by radiation.

11. HEAT ENERGY REVIEW
An egg can be cooked by radiation by putting in a microwave or in a solar cooker. The waves travel to egg and cook egg.

12. By which method is heat energy largely reaching the man
By which method is heat energy largely reaching the man? Explain your choice.

13. Radiation-heat travels as electromagnetic waves toward man

14. Explain what will happen to the heat energy when a glass of iced tea is placed next to a bowl of soup and allowed to sit for a long while.

15. The heat energy will transfer from the soup to the iced tea (and other surrounding matter) until they are all at equal temperatures (thermal equilibrium)

16. _ _ is transferred between objects of different temperatures.
HEAT ENERGY REVIEW
_ _ is transferred between objects of different temperatures.

17. HEAT ENERGY REVIEW
HEAT ENERGY

18. Give an example of a heat being transferred by radiation.
HEAT ENERGY REVIEW
Give an example of a heat being transferred by radiation.

19. __ is the measure of the average kinetic energy of the molecules in a substance

20. HEAT ENERGY REVIEW
temperature

21. Give an example of a heat being transferred by conduction.
HEAT ENERGY REVIEW
Give an example of a heat being transferred by conduction.

22. Answers will vary: some examples—car engine heating up, tires on bike after a ride, hand holding a snowball

23. HEAT ENERGY REVIEW
Describe how an egg may be cooked when heat is transferred by convection.

24. HEAT ENERGY REVIEW
An egg may be poached or boiled—placed in a bath of water. The water transfers the heat to the egg because convection currents form when the heat of the burner is turned on.

25. _ _ is the expansion of molecules due to an increase in heat energy.
HEAT ENERGY REVIEW
_ _ is the expansion of molecules due to an increase in heat energy.

26. HEAT ENERGY REVIEW
THERMAL EXPANSION

27. HEAT ENERGY REVIEW
__ __ occurs when the heat energy between 2 or more substances (of varying temperatures) is exchanged until all of the substances have the same temperature

28. HEAT ENERGY REVIEW
thermal equilibrium

29. __ is the transfer of heat between two or more objects or within a substance (molecule to molecule)

30. CONDUCTION

31. __ is the transfer of heat through a fluid; the matter moves the heat between areas of unequal temperatures

32. CONVECTION

33. __ is the transfer of heat in the form of waves.

34. RADIATION

35. __ allow heat to flow through it easily.

36. CONDUCTORS

37. This type of heat transfer can move over great distances in a vacuum (empty space).

38. RADIATION

39. Identify at which point(s) heat is being transferred by conduction

40. X-conduction (radiation if it is a gas fire)
Y-convection
Z-conduction

41. Give an example of good conductor

42. Any kind of metal

43. Give an example of a good insulator

44. Answers will vary: air, water, plastic, Styrofoam, feathers, wool, etc.

45. Explain how heat is being transferred by convection

46. The heat travels from the bottom of the pan to the top by moving with the hot, less dense water as it rises.

47. True or False. Explain your choice.
A good insulator is a poor conductor

48. True. A good insulator is a poor conductor because it delays (slows down) the transfer of heat energy through a substance.

49. Describe what happens to the movement and arrangement of molecules in a fluid when heat is lost

50. THE MOLECULES MOVE SLOWER AND CONTRACT

51. Identify where heat is being transferred by conduction.

52. answer

53. Heat always flow from ___ matter to ____ matter.

54. From hotter substances to cooler ones

55. Describe what happens to the movement and arrangement of molecules in matter when they are heated

56. THE MOLECULES MOVE FASTER AND EXPAND

57. __ do not allow heat to flow easily through it; they trap heat.

58. INSULATORS

59. Identify where heat is being transferred by radiation.

60. ANSWER

61. In general, which will absorb heat better: a solid, liquid, or gas?

62. A SOLID

63. Identify where heat is being transferred by convection.

64. answer

65. Using what you know about the transfer of heat, explain why air conditioners are often placed up high in a room.

66. ACs are placed up high so that the cold, dense air can sink and push the warm, less dense air up (to be cooled)