# Chapter 10 Study Questions

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1 Chapter 10 Study Questions Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Which of the following temperatures is the lowest? a. 100ºC c. 100 K b. 100ºF d. They are the same. 2. Compared with the Pacific Ocean, a cup of hot chocolate has a. more thermal energy and a higher temperature. b. less thermal energy and a higher temperature. c. more thermal energy and a lower temperature. d. less thermal energy and a lower temperature. 3. The energy units on a food label are a. degrees. c. calories. b. Calories. d. joules. 4. Which of the following materials would NOT be a good insulator? a. wood c. metal b. cloth d. rubber 5. The engine in a car is a(n) a. heat engine. c. internal combustion engine. b. external combustion engine. d. Both (a) and (c) 6. Materials that warm up or cool down very quickly have a a. low specific heat capacity. c. low temperature. b. high specific heat capacity. d. high temperature. 7. In an air conditioner, thermal energy is a. transferred from higher to lower temperatures. b. transferred from lower to higher temperatures. c. used to do work. d. taken from air outside a building and transferred to air inside the building. 8. A tile floor feels colder on your bare feet than a wooden floor because the tile floor a. is a better insulator. b. has a smoother surface than a wooden floor. c. conducts more energy from your feet. d. will always have a lower temperature than a wooden floor. 9. The lowest possible temperature is a. 273 K. c. 0ºC. b. 0ºF. d. 0 K. 10. In which state does water have the lowest average kinetic energy? a. liquid c. solid b. gas d. Each state has the same kinetic energy. 11. When water vapor condenses, a. the surrounding air is cooled. c. the surrounding air is warmed. b. the water molecules spread apart. d. a solid is formed. 12. Which of the following represents the greatest amount of energy? a. 1,000 cal c. 100 kcal b. 500 Cal d. 100,000 J 13. Which of the following processes is NOT a physical change?

2 a. melting c. freezing b. boiling d. burning 14. If two substances have the same temperature, then a. the substances have the same average kinetic energy. b. their particles will not react chemically. c. the substances have equal thermal energies. d. their specific heats are identical. 15. The official SI temperature scale is the a. Celsius scale. c. Faraday scale. b. Fahrenheit scale. d. Kelvin scale. 16. Alcohol in a thermometer rises as a result of a. thermal contraction. c. absolute contraction. b. thermal expansion. d. absolute expansion. 17. Absolute zero is a. 0 K. c. 0 F. b. 0 C. d. All of the above 18. Which of the following equations can be used to calculate the energy transferred by heat? a. b. c. d. 19. Which of the following is used to find the specific heat capacity of a substance? a. balance c. calorimeter b. anemometer d. barometer 20. Some bridges are constructed with small gaps called expansion joints because a. it prevents the bridge from falling during an earthquake. b. concrete segments expand on hot days. c. it allows the bridge to raise and lower for passing boats. d. it makes a "thuh-thunk" noise as you drive over it. 21. A bimetallic strip in a thermostat uncoils because of a. thermal expansion. c. absolute expansion. b. thermal contraction. d. absolute contraction. 22. Convert 68 F to C. a. 180 C c. 56 C b. 70 C d. 20 C 23. Because particles are in motion, they have a. thermal expansion. c. kinetic energy. b. thermal contraction. d. potential energy. 24. The temperature of a substance is determined by a. how much of the substance you have. b. whether the substance is a solid, liquid, or a gas.

3 c. how fast the atoms or molecules of the substance are moving. d. the potential energy of the substance. 25. The motion of particles in a substance is a. random. c. perpendicular. b. the same. d. parallel. 26. Thermostats use two metals in a bimetallic strip because a. different materials expand at different rates, causing the strip to uncoil. b. it looks better. c. one metal measures the temperature, while the other metal closes the circuit. d. None of the above 27. Heat is a. the same thing as temperature. b. the same as thermal expansion. c. the transfer of energy between objects that are at different temperatures. d. All of the above 28. The total kinetic energy of the particles that make up a substance is a. thermal energy. c. temperature. b. thermal expansion. d. heat. 29. Which of the following has the most thermal energy? a. a pot of soup c. a plateful of soup b. a bowl of soup d. a spoonful of soup 30. You add ice to the drinks in an insulated cooler because you hope that a. the ice and drinks will reach thermal equilibrium. b. the drinks will transfer heat to the ice, thereby cooling the drinks. c. the kinetic energy of the drink's molecules will be reduced. d. All of the above 31. At thermal equilibrium, a. the thermal energy of the warmer object increases. b. the thermal energy of the warmer object decreases. c. no net change in either object's thermal energy occurs. d. None of the above 32. When two objects reach thermal equilibrium, a. thermal energy is no longer transferred between the two objects. b. both objects have the same temperature. c. one object may have more thermal energy. d. All of the above 33. The transfer of thermal energy from one substance to another through direct contact is a. radiation. c. convection. b. conduction. d. insulation. 34. The transfer of thermal energy by the movement of a liquid or a gas is a. convection. c. radiation. b. insulation. d. conduction. 35. The transfer of thermal energy through space is a. convection. c. radiation. b. conduction. d. insulation. 36. The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of a. convection. c. insulation. b. conduction. d. radiation.

4 37. One possible cause of tectonic plate motion is the rise of hot material from deep within the Earth while cooler material near the surface sinks. As this process repeats, it is an example of a. convection. c. radiation. b. conduction. d. insulation. 38. Farmers grow vegetables in winter using greenhouses, which receive heat by a. convection. c. radiation. b. conduction. d. insulation. 39. Warming up beside a campfire is an example of a. insulation. c. radiation. b. conduction. d. convection. 40. Which of the following is NOT a conductor? a. curling iron c. copper pipe b. iron skillet d. oven mitt 41. Water has a specific heat capacity of 4,184 J/kg C. This means that it requires a. 1 J of energy to raise 1 kg of water by 4,184 C. b. 1 J of energy to raise 4,184 kg of water by 1 C. c. 4,184 J of energy to raise 1 kg of water by 1 C. d. 4,184 J of energy to raise 1 kg of water by 1 F. 42. Particles of a do not move fast enough to overcome the strong attraction between them, so they are held tightly together. a. liquid c. gas b. solid d. plasma 43. Particles of a vibrate in place. a. solid c. gas b. liquid d. plasma 44. Particles of a move fast enough to overcome some of the attraction between them. a. gas c. solid b. liquid d. plasma 45. Particles of a are able to slide past one another. a. plasma c. gas b. liquid d. solid 46. Particles of a move fast enough to overcome nearly all of the attraction between them. a. solid c. gas b. liquid d. Both (a) and (b) 47. Particles of a move independently of one another. a. solid c. gas b. liquid d. All of the above 48. Particles move slowest in a a. solid. c. gas. b. liquid. d. plasma. 49. A change of state is a a. physical change. b. chemical change. c. process by which two states of matter coexist. d. process that converts one substance into an entirely new substance that cannot be changed back again. 50. Ice begins to melt at 0 C. When an ice cube has just fully melted, its temperature a. is the same as the melting point.

5 b. is greater than the melting point. c. is less than the melting point. d. fluctuates. 51. Liquid butter becomes solid when it is in a refrigerator. Therefore, the freezing point of butter a. is at the same temperature as the freezing point of ice. b. is at a higher temperature than the freezing point of ice. c. is at a lower temperature than the freezing point of ice. d. cannot be compared with ice. 52. You can get a more severe burn from steam than from boiling water because a. steam contains more energy per unit mass than boiling water. b. steam contains less energy per unit mass than boiling water. c. steam contains the same amount of energy per unit mass than boiling water. d. None of the above 53. Water is typically used in heating systems because it has a specific heat capacity when compared with other substances. a. low c. equal b. moderate d. high 54. In a warm-air heating system, warm air is circulated through the rooms by currents. a. conduction c. insulation b. convection d. radiation 55. systems do NOT have moving parts. a. Passive solar heating c. Warm-air heating b. Active solar heating d. Hot-water heating 56. One type of engine used to generate electrical energy at a power plant is a a. modern form of a steam engine. c. internal combustion engine. b. external combustion engine. d. Both (a) and (b) 57. Coastal areas stay cool during the summer when inland temperatures soar. These areas stay moderately warm in winter, even when inland temperatures drop. This happens because a. land has a higher specific heat than water. b. water has a higher specific heat than land. c. there is more water than land. d. there is more land than water. 58. Much of the hot water in Reykjavík, Iceland comes from wells bored into the hot springs of Reykir. The water temperature from the wells is F. Express this temperature in degrees Celsius. a C c C b. 87 C d C 59. The Hawaiian lavas at Kilauea Crater have the highest temperatures measured on Earth s surface over 2192 F! Express this temperature in degrees Celsius. a C c C b C d C 60. Hypothermia is a condition in which a person's body temperature drops below 95 F. If a person s body temperature drops below 87.8 F, they can die. What is this fatal temperature in Kelvin? a. 242 K c K b K d. 304 K

6 61. Just as the human body cannot survive if its temperature falls to too low a temperature, it also cannot survive if its temperature is too high. In a condition called hyperthermia, energy is transferred to the body from its surroundings, causing the body s temperature to increase. The condition known as heat stroke is a severe form of hyperthermia. Normally, the human body cannot survive for long at a temperature of about 42 C, although a recent survivor of heat stroke had a high temperature of nearly 47 C. Express the survivor's temperature in Kelvin. a. 231 K c. 315 K b. 226 K d. 320 K 62. On July 10, 1913, the temperature reached 330 K in Death Valley, California the hottest temperature ever reached in the United States. Calculate this temperature in degrees Celsius. a. 57 C c. 603 C b C d. 626 C 63. Air that slowly falls from high altitudes can result in cold fronts that sweep across many states. At 30,000 feet above the Earth s surface, the air temperature can be around 67 F. Find this temperature in Celsius. a. 55 C c. 5 C b. 69 C d. 206 C 64. In 1906, a 0.6 kg diamond was found at the Premier Mine in South Africa the world s largest uncut diamond. Suppose the diamond s temperature changed by 2 C as it was cut. If the heat capacity of diamond is 710 J/kg C, how much energy was transferred to the diamond by heat? a. 1.2 J c. 852 J b J d J 65. A 0.3 kg piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J/kg C, what is the change of the copper's temperature? a. 51 C c. 567 C b. 170 C d C 66. The water in a swimming pool transfers J of energy by heat to the cool night air. If the temperature of the water, which has a specific heat of 4186 J/kg C, decreases by 10 C, what is the mass of the water in the pool? a kg c. 41,860 kg b. 46,046 kg d. 262,780 kg 67. Two substances can have the same temperature but different amounts of thermal energy because temperature, unlike thermal energy, a. depends on weight. c. depends on mass. b. depends on density. d. does not depend on mass. 68. A small amount of a substance at a particular temperature will have a large amount of the substance at the same temperature. a. less thermal energy than c. the same thermal energy as b. more thermal energy than d. no thermal energy, unlike 69. Which of the following has the LEAST thermal energy? a. a drop of boiling water c. a pot of boiling water b. a cup of boiling water d. all have the same thermal energy 70. Which of the following does NOT vary with the mass of a substance? a. heat c. thermal energy b. energy d. temperature 71. The temperature of the air in a city may be higher than in the surrounding countryside because a. of the heat island effect. b. excessive amounts of waste thermal energy are added to the urban environment. c. of automobiles, factories, home heating and cooling, and the local population.

7 d. All of the above 72. If you had a refrigerator in Antarctica, you would have to to keep it running. a. keep it outdoors c. surround it with conductive materials b. heat it d. use ice 73. The area near the back of a refrigerator feels warm because a. of the temperature change from the cool refrigerator and the warm air around the box. b. it transfers thermal energy from outside the refrigerator to the condenser coils. c. it transfers thermal energy from inside the refrigerator to the condenser coils. d. liquid becomes cold as it is compressed by a compressor. 74. In a, fuel combines with oxygen in a chemical change that produces thermal energy. a. heat engine c. active solar heating system b. refrigerator d. passive solar heating system Short Answer 75. What is the coldest temperature possible? 76. Convert 35ºC to degrees Fahrenheit. Examine the graph below, and answer the questions that follow. 77. What physical change does this graph illustrate? 78. What is the freezing point of this liquid? 79. What is happening at the point where the line is horizontal? 80. Which temperature is the warmest: 130ºC, 180ºF, or 373 K? Show your work. (Hint: ºC = (ºF 32); K = ºC + 273) 81. The graph below shows the changes of state that occur as energy is continuously added to 1 g of water. Use the graph to answer the following question.

8 In which regions of the graph is the average kinetic energy of water particles increasing? Explain.

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