Thermal Energy Pre/Study Guide

In some places, hot water from underground can shoot up into the air through a hole in the ground. When this happens, the ground surrounding the water increases in temperature.

What happens to the molecules in the ground when the temperature of the ground increases?

• More heat molecules combine with the molecules in the ground.

• The energy of the molecules in the ground decreases.

• The energy of the molecules in the ground increases.

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NGSS.MS-PS1-4

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A space shuttle is covered with two layers of carbon. The two layers are the same size and have the same number of molecules. When the space shuttle is sitting on the ground, the layers do not touch, as shown in the diagram above. When the space shuttle takes off, the layers move so that they are touching. Use the information in the diagram to answer the question.

How does the temperature of the outer layer compare with the temperature of the inner layer before the layers touch? What will happen after the layers have been touching for a while?

• Before the layers touch, the outer layer is hotter than the inner layer. Once the layers are touching, the outer layer will transfer kinetic energy to the molecules in the cooler inner layer until both layers reach the same temperature, which will be in between their starting temperatures.

• Before the layers touch, the outer layer is hotter than the inner layer. Once the layers are touching, the cooler inner layer will gain kinetic energy until the molecules of both layers have an energy of 90, because hotter things increase the temperature of cooler things.

• Before the layers touch, the outer layer is cooler than the inner layer. Once the layers are touching, the inner layer will transfer kinetic energy to the molecules in the cooler outer layer until both layers reach the same temperature, which will be in between their starting temperatures.

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NGSS.MS-PS1-4

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Louis has two sets of two gears (Set A and Set B) that he is using to build two different machines. He has all the gears laying out separately, as shown in the diagram above. Then he puts the gears into the machines so that the gears in Set A are touching each other and the gears in Set B are touching each other. Use the information in the diagram to answer the question.

After the gears have been touching for a while, which of the two bottom gears will be cooler, and why?

• The smaller bottom gear will be cooler than the larger bottom gear, because less energy has to transfer for the molecules of the top gear to reach the same temperature as the molecules of the top gear.

• The larger bottom gear will be cooler than the smaller bottom gear, because the energy that transferred to it was spread out over more molecules.

• Both gears will be the same temperature, because both of the top gears had the same amount of energy to transfer and the molecules in the bottom gears start with the same energy.

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NGSS.MS-PS1-4

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NGSS.MS-PS3-5

Lin cooked a pot of soup, then put half the soup in the freezer for a while. Now the soup in the pot is hot, and the soup in the freezer is cold.

What is the difference between the molecules of the soup in the pot and the molecules of the soup in the freezer?

• The molecules of the soup in the pot are moving and the molecules of the soup in the freezer are not moving.

• The molecules of the soup in the pot are moving faster than the molecules of the soup in the freezer.

• There is no difference because all of the soup is made of the same type of molecules.

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NGSS.MS-PS1-4

Engineers design computers to cool down quickly so they do not break.

What happens to the molecules in a computer when the temperature of the computer decreases?

• The energy of the molecules in the computer decreases.

• The cold energy of the molecules in the computer increases.

• The computer loses heat molecules.

Tags

NGSS.MS-PS1-4

A chef takes four pans from different parts of her kitchen and puts them in two stacks. The diagram above shows the pans before they touch each other.

After the pans have been touching for a while, which of the two bottom pans will be cooler, and why?

• The larger bottom pan will be cooler than the smaller bottom pan. It started with more total energy, so less energy had to transfer for both pans to reach the same total energy.

• The larger bottom pan will be cooler than the smaller bottom pan, because the energy that transferred to it will have spread out over more molecules.

• Both pans will be the same temperature because both of the top pans had the same amount of energy to transfer and the molecules in the bottom pans start with the same energy.

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NGSS.MS-PS1-4

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Joseph puts a piece of toast on a plate. The toast is hot from the toaster. When he puts the toast on the plate, the energy of the plate increases.

What must be true of the energy of the toast?

• Its energy stays the same while the energy of the plate increases.

• Its energy decreases while the energy of the plate increases.

• Its energy increases while the energy of the plate increases.

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NGSS.MS-PS1-4

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Nistu is cooking rice in a pot. When she leaves the pot on the stove for a while, the temperature of the rice increases.

What happens to the molecules of the rice when the temperature of the rice increases?

• The energy of the molecules in the rice increases.

• The cold energy of the molecules in the rice decreases.

• The energy of the molecules in the rice decreases.

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NGSS.MS-PS1-4

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Ralph and Sheila are at a construction site and they are stacking bricks. The diagram above shows the bricks before they touch. Use the information in the diagram to answer the question.

After the bricks have been touching for a while, whose top brick will be cooler?

• Ralph’s top brick will be cooler than Sheila’s top brick, because less energy has to transfer for Ralph’s brick’s molecules to reach the same temperature as the molecules of his bottom brick.

• Sheila’s top brick will be cooler than Ralph’s top brick, because the energy that transferred to Sheila’s was spread out over more molecules.

• Both will be the same temperature, because both bottom bricks had the same amount of energy to transfer and the molecules in the top bricks started with the same energy.

Tags

NGSS.MS-PS1-4

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After a candle is blown out, the wax of the candle decreases in temperature.

What happens to the molecules of the wax when the temperature of the wax decreases?

• The energy of the molecules of the wax decreases.

• The energy of the molecules of the wax increases.

• The wax loses heat molecules.

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NGSS.MS-PS1-4