:)

47) When a solid melts, energy is A) absorbed by the solid. B) released by the solid. C) both of these D) neither of these

A) absorbed by the solid.

51) When vapor transforms to a plasma, energy must be A) absorbed by the vapor. B) released from the vapor. C) both of these D) neither of these

A) absorbed by the vapor.

62) When condensation occurs inside your bedroom window, the air outside is appreciably A) colder. B) warmer. C) both of these D) neither of these

A) colder.

64) In a heat pump, warming is accomplished when A) condensation occurs in its coils. B) vaporization occurs in its coils. C) both of these D) neither of these

A) condensation occurs in its coils.

6) The surface of hot water has a relatively high rate of A) evaporation. B) condensation. C) conductivity. D) convection.

A) evaporation.

81) The minimum amount of steam at 100°C needed to melt 1 gram of 0°C ice is A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of the above

A) 0.125 gram.

73) Which will melt more ice when placed on its surface, a kilogram of wood or a kilogram of iron of the same high temperature? A) 1 kg of wood. B) 1 kg of iron. C) both the same D) neither of these

A) 1 kg of wood.

2) The molecules in a room-temperature glass of water jostle around at A) a great variety of speeds. B) much the same rates of speed. C) a very small range of speeds.

A) a great variety of speeds

16) Evaporation is a cooling process and condensation is A) a warming process. B) a cooling process also. C) neither of these

A) a warming process.

22) Food in a pressure cooker is cooked faster due to A) higher temperature. B) greater rate of bubble formation in the water. C) energy transfer in the water. D) all of the above E) none of the above

A) higher temperature.

38) The temperature at which water freezes is the same as the temperature at which A) ice melts. B) water boils in a pressure cooker. C) both of these D) neither of these

A) ice melts.

40) Foreign ions introduced to water A) lower the freezing point of water. B) raise the freezing point of water. C) do not affect water's freezing point.

A) lower the freezing point of water.

43) When you walk barefoot on red-hot wooden coals it is best if A) no pieces of metal are among the coals. B) you walk slowly to demonstrate your courage. C) you impress your friends by carrying away bits of wood between your toes. D) all of the above E) none of the above

A) no pieces of metal are among the coals.

28) Increased air pressure on the surface of hot water tends to A) prevent boiling. B) promote boiling. C) both of these D) neither of these

A) prevent boiling.

11) When fast-moving water molecules collide they tend to A) rebound without sticking. B) stick. C) both of these D) neither of these

A) rebound without sticking.

49) When a gas is changed to a liquid, the gas A) releases energy. B) absorbs energy. C) both of these D) neither of these

A) releases energy.

79) Which involves a larger number of calories? A) the condensation of 1 gram of steam at 100°C to water at 100°C B) the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero C) both the same D) none of these

A) the condensation of 1 gram of steam at 100°C to water at 100°C

5) A hot dog pants A) to enable evaporation in its mouth and bronchial tract. B) to provide more oxygen into its lungs. C) to impress dogs of the opposite sex. D) none of the above

A) to enable evaporation in its mouth and bronchial tract.

20) On a muggy day, water molecules in the air that strike our bodies A) transfer some of their kinetic energy to us. B) gain kinetic energy as they change phase. C) form an insulating layer on our bodies.

A) transfer some of their kinetic energy to us.

61) When water vapor condenses on the inside of a window, the room becomes slightly A) warmer. B) cooler. C) both of these D) neither of these

A) warmer.

59) When ice crystals form in clouds, the surrounding air A) warms. B) cools. C) neither of these

A) warms.

44) If bits of the coals do not stick to your feet while walking barefoot on red-hot coals, it would be best if your feet are A) wet. B) dry. C) warm. D) cold. E) very hot.

A) wet.

42) To illustrate regelation with ice it is important that a A) wire is used. B) string is used. C) either of these D) none of the above

A) wire is used

17) A boy scout will be burned more severely by A) 100 g of water at 100°C. B) 100 g of steam at 100°C. C) both about equally D) neither of these

B) 100 g of steam at 100°C.

29) Compared to sea level, water in an open pot in the mountains boils at A) a higher temperature. B) a lower temperature. C) the same temperature. D) none of the above

B) a lower temperature.

46) When a solid is changed to a liquid, the solid A) releases energy. B) absorbs energy. C) both of these D) neither of these

B) absorbs energy.

19) We feel uncomfortably warm on a muggy day because water molecules are A) evaporating from our moist bodies. B) condensing on our bodies. C) evaporating and condensing on our bodies at the same rate. D) none of the above

B) condensing on our bodies.

60) Melting snow tends to A) warm the surrounding air. B) cool the surrounding air. C) neither of these

B) cool the surrounding air.

8) A canteen that is wet on the outside results in water inside that is A) warmer. B) cooler. C) both of these D) neither of these

B) cooler.

15) When a geyser erupts, pressure at its bottom A) increases. B) decreases. C) is unaffected D) all of the above E) none of the above

B) decreases.

45) To melt ice, add A) temperature. B) energy. C) force. D) time.

B) energy.

37) The addition of salt to water affects its A) crystal composition. B) freezing point. C) viscosity. D) liquidity. E) none of the above

B) freezing point.

77) Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room A) blocks of foam plastic. B) large tubs of water. C) an ample supply of fire wood. D) none of the above

B) large tubs of water.

36) An inventor discovers a harmless and tasteless salt, which when added to water changes its boiling point. The market value for this salt will be better if the salt A) lowers the boiling point of water. B) raises the boiling point of water. C) either raises or lowers the boiling point, as the food would be cooked either way. D) none of the above

B) raises the boiling point of water.

35) Water in a car radiator sometimes boils explosively when the radiator cap is removed, which is due to sudden A) rapid evaporation. B) reduced pressure. C) excess condensation.

B) reduced pressure.

48) When liquids change to a solid, they A) absorb energy. B) release energy. C) both of these D) neither of these

B) release energy.

52) When moth balls sublime to gas they A) absorb energy. B) release energy. C) both of these D) neither of these

B) release energy.

50) When a vapor condenses, energy is A) absorbed by the vapor. B) released from the vapor. C) both of these D) neither of these

B) released from the vapor.

27) For increased atmospheric pressure, the boiling point of water A) goes down. B) rises. C) remains at 100 degrees C.

B) rises.

12) When slow-moving water molecules collide they tend to A) rebound without sticking. B) stick. C) both of these D) neither of these

B) stick.

82) Rapid evaporation of hot water can lead to A) superheated steam. B) the formation of ice. C) both of these D) neither of these

B) the formation of ice.

33) A good cook knows that the temperature of violently boiling water is A) higher than that of simmering water. B) the same as that of simmering water. C) actually lower than 100°C. D) neither of the above

B) the same as that of simmering water.

39) The temperature at which a liquid freezes is A) affected by foreign ions. B) the same temperature at which its solid form melts. C) both of these D) neither of these

B) the same temperature at which its solid form melts.

63) In a heat pump, cooling is accomplished when A) condensation occurs in its coils. B) vaporization occurs in its coils. C) both of these

B) vaporization occurs in its coils.

56) When water freezes, the surrounding air is A) cooled. B) warmed. C) both of these D) neither of these

B) warmed.

57) During snow fall, the surrounding air is A) cooled. B) warmed. C) both of these D) neither of these

B) warmed.

58) When steam condenses, the surrounding air is A) cooled. B) warmed. C) both of these D) neither of these

B) warmed.

72) When water vapor changes phase to become water in a cloud, the surroundings become A) cooler. B) warmer. C) both of these D) neither of these

B) warmer.

78) The calories needed to change 10 grams of ice at 0°C to steam at 100°C is A) 6200. B) 6400. C) 7200. D) 8000. E) none of the above

C) 7200.

10) The toy drinking bird nicely illustrates A) evaporation. B) condensation. C) both of these D) neither of these

C) both of these

18) Steam burns are more damaging than burns caused by boiling water because steam A) has more energy per gram than boiling water. B) releases additional energy when it condenses. C) both of these D) neither of these

C) both of these

25) Water can be brought to a boil by A) applying heat. B) reducing air pressure on its surface. C) both of these D) neither of these

C) both of these

32) Water can be turned to ice by A) lowering the surrounding air pressure. B) extracting energy. C) both of these D) neither of these

C) both of these

53) You can add heat without raising temperature to A) ice. B) boiling water. C) both of these D) neither of these

C) both of these

7) What occurs in a pan of water placed outdoors on a warm day? A) evaporation B) condensation C) both of these D) neither of these

C) both of these

74) A heat pump can A) cool an environment. B) warm an environment. C) both of these D) neither of these

C) both of these

30) A geyser such as Old Faithful in Yellowstone Park is similar to a A) vacuum bottle. B) canteen. C) coffee percolator. D) teakettle. E) vat of molten lead.

C) coffee percolator.

9) Double-pane windows contain nitrogen rather than air to prevent A) gas escape. B) thermal conduction. C) condensation. D) heat flow.

C) condensation.

4) When you blow over hot soup to cool it you are helping A) to slightly increase air pressure atop the soup surface. B) more energetic particles in the soup to escape. C) conduction, convection, and radiation. D) none of the above

C) conduction, convection, and radiation.

1) Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by A) conduction. B) condensation. C) evaporation. D) melting.

C) evaporation

24) Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you should boil the eggs A) with a hotter flame. B) for a shorter time. C) for a longer time. D) all of the above E) none of the above

C) for a longer time.

31) Hydrothermal vents deep beneath the ocean surface attain temperatures far above 100°C due to A) higher salt content. B) reduced salt content. C) greater pressure. D) all of the above E) none of the above

C) greater pressure.

14) The pressure at the bottom of a geyser is A) less than nearer the top. B) the same as nearer the top C) greater than nearer the top. D) all of the above E) none of the above

C) greater than nearer the top.

71) To turn 1 gram of boiling water to steam requires A) almost as much energy as changing 1 gram of 0°C water to the boiling point. B) as much as increasing 1 kilogram of 95°C water to the boiling point. C) more energy than needed to turn 1 gram of absolute-zero ice to the boiling point. D) none of the above

C) more energy than needed to turn 1 gram of absolute-zero ice to the boiling point.

41) Dean teaches that the phenomenon of regelation is due to the A) freezing point of water. B) melting point of ice. C) open-structured nature of ice crystals. D) high specific heat of water.

C) open-structured nature of ice crystals.

26) When heat is added to boiling water, its temperature A) increases. B) decreases. C) remains unchanged. D) none of the above

C) remains unchanged.

75) Firefighters find that the temperature of burning material is best lowered when water is A) used in small amounts. B) pointed away from the flames. C) sprayed as a fine mist. D) salted.

C) sprayed as a fine mist.

55) The most responsible factor for whether a substance takes the phase of solid, liquid, gas, or plasma is its A) composition. B) atomic shell configuration. C) temperature. D) none of the above

C) temperature.

The reason that evaporation is a cooling process is A) radiation of heat during the process. B) due to conduction and convection. C) the more energetic molecules escape the liquid. D) all of the above E) none of the above

C) the more energetic molecules escape the liquid

76) Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because A) they are good radiators of energy. B) they are good absorbers of radiant energy. C) the water in them contains dissolved salts and sugars. D) they are relatively dense. E) all of the above

C) the water in them contains dissolved salts and sugars.

65) A refrigerator A) produces cold. B) causes internal energy to disappear. C) transfers internal energy from inside to outside. D) transfers heat into cold. E) none of the above

C) transfers internal energy from inside to outside.

66) The cooling effect inside a refrigerator is produced by A) an electric motor that converts electrical energy to internal energy. B) compressing the refrigeration gas. C) vaporizing the refrigeration liquid. D) proper insulation. E) exchanging warmer air with colder air.

C) vaporizing the refrigeration liquid.

54) As a block of ice at 0°C melts, the block absorbs energy A) and decreases in temperature. B) and increases in temperature. C) without a temperature change. D) all of the above E) none of the above

C) without a temperature change.

34) In one word, how can water in the power plant of a nuclear submarine far exceed 100°C? A) conductivity B) evaporation C) condensation D) pressure E) vaporization

D) pressure

80) The mass of ice that can be melted by 1 gram of 100°C steam is (Hint: Don't forget about hot water remaining from condensed steam.) A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of the above

D) 8 grams.

13) The main difference between a fog and a cloud is A) water vapor content. B) density of vapor. C) seeding. D) altitude. E) temperature.

D) altitude.

67) Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be A) wrapped in newspaper. B) drained of water periodically. C) kept away from the food. D) broken into smaller pieces. E) none of the above

D) broken into smaller pieces.

70) To turn 50 grams of boiling water to steam requires A) 50 calories. B) 500 calories C) 540 calories. D) more than 540 calories. E) none of the above

D) more than 540 calories.

23) In mountain regions, food cooked in boiling water cooks slower than when cooked at sea level. If the temperature beneath the pot of boiling water is increased, the food will cook A) faster. B) slower still. C) both of these D) neither of these

D) neither of these

69) To melt 50 grams of 0-degree-Celsius ice requires A) 25 calories. B) 50 calories. C) 80 calories. D) none of the above

D) none of the above

21) Morning dew on the grass is a result of A) evaporation of water. B) the open-structured form of water crystals. C) air pressure on water vapor. D) slow-moving water molecules sticking to one another.

D) slow-moving water molecules sticking to one another.

68) To increase the temperature of 50 grams of water by 2 Celsius degrees requires A) 0.04 calorie. B) 2 calories. C) 4.19 calories. D) 25 calories. E) 100 calories.

E) 100 calories.