Unit 2: Heat Transfer SLG

Which describes the amount of heat energy that is needed to raise the temperature of 1 kilogram of a substance by 1°C?

• convection heat capacity

• potential heat capacity

• specific heat capacity

• radiation heat capacity

Temperature can be used to measure a particle's

• Chemical energy

• Ionic energy

• Potential energy

•    Kinetic energy

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The temperature of a 6.0 g sample of glass changed from 20.0°C to 45.0°C when it absorbed 550 J of heat. What is the specific heat of this glass?

• 130 J/g °C

• 3.7 J/g °C

• 2300 J/g °C

• 0.27 J/g °C

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How does heat flow?

• From object with the cooler temperature to an object with the warmer temperature.

• From object with the warmer temperature to an object with the cooler temperature.

• From object with the coldest temperature to an object with the hottest temperature.

• Any direction it wants to flow.

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Ashunte and Nicole are making hot chocolate over a campfire. Energy from the fire is transferred to the hot chocolate to heat it. What is the BEST way to find out how much energy is transferred to the hot chocolate?

• Measure the temperature of the hot chocolate.

• Measure the mass of the hot chocolate.

• Measure the density of the hot chocolate.

• Measure the volume of the hot chocolate.

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Jose's class is looking to determine the material that will do the best job of keeping a container of cold juice cool for the longest time. Based on the information in the picture, which type of material would be the best one to store the cold juice?

• copper

• aluminum

• porcelin

• iron

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Which BEST describes radiation heat transfer?

• The transfer of heat due to circulation which is based on changing densities

• The transfer of heat energy from one solid that is in contact with another solid

• The transfer of heat from one location to another through the movement of fluids

• The transfer of heat through electromagnetic waves which does not involve the movement of matter

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Lucas left a metal bowl and a wooden bowl outside overnight. The next morning, he picked up the bowls to bring them inside. He noticed that the metal bowl felt much cooler than the wooden bowl. His father explained that both bowls were actually the same temperature. Which statement best describes why the metal bowl felt cooler even though the bowls were the same temperature?

• Metal transfers heat away from the skin by conduction, creating the sensation of coolness.

• Wood transfers heat away from the skin by convection, creating the sensation of warmth.

• Wood transfers heat to the skin by radiation, creating the sensation of warmth.

• Metal removes the moisture from the skin by absorption, creating the sensation of coolness.

The diagram in the picutre shows the setup for an experiment involving a 1000 mL beaker, filled with 500 mL of water, sitting on a burner. Which best describes the molecular motion of the water particles as the burner supplies heat?

• The molecular motion will increase as less thermal energy is absorbed.

• The molecular motion will decrease as less thermal energy is absorbed.

• The molecular motion will increase as more thermal energy is absorbed.

• The molecular motion will decrease as more thermal energy is absorbed.

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Darius sets up two trays of water with a heat lamp between them. He records the initial temperature of the water. Then, he turns the heat lamp on. After 20 minutes, Darius records the temperature of the water again. His set up and data are shown below.

Which of the following BEST explains the results of this experiment?

• The water in the trays remained at similar temperatures due to convection. Because heat rises with warm air, the thermal energy from the lamp did not reach the trays of water.

• The water in the trays remained at similar temperatures due to convection. Because the trays were located the same distance from the lamp, they gained a similar amount of thermal energy.

• The water in Tray 1 gained more energy due to conduction from the lamp. Because the light molecules bumped into the water molecules in Tray 1 more, the water in this tray was heated more.

• The water in Tray 1 gained more thermal energy due to radiation from the lamp. Because the light from the lamp was directed at Tray 1 more, the radiation from the light heated the water in this tray more.

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