When a hot and cold sample first come into contact with each other...

some of the molecules in both samples will have a different kinetic energy

all of the molecules in both samples will have the same kinetic energy

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?

The energy of the molecules in the ground increases.

More heat molecules combine with the molecules in the ground.

The energy of the molecules in the ground decreases.

The cold energy of the molecules in the ground decreases.

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.

Before the layers touch, the layers are different temperatures. Once the layers are touching, kinetic energy and cold energy will transfer between the molecules in the two layers until both layers reach the same temperature, which will be in between their starting temperatures.

A plumber is going to put two pipes in a wall, one in front and one in back. The pipes will be touching once they are installed. Both pipes are the same size and have the same number of molecules. The diagram above shows the pipes now, before they have touched. Use the information in the diagram to answer the question. How does the temperature of the front pipe compare with the temperature of the back pipe before the pipes touch? What will happen after the pipes have been touching for a while?

Before the pipes touch, the front pipe is hotter than the back pipe. Once the pipes are touching, the front pipe will transfer kinetic energy to the molecules in the cooler back pipe until both pipes reach the same temperature, which will be in between their starting temperatures.

Before the pipes touch, the front pipe is cooler than the back pipe. Once the pipes are touching, the back pipe will transfer kinetic energy to the molecules in the cooler front pipe until both pipes reach the same temperature, which will be in between their starting temperatures.

Before the pipes touch, the two pipes are different temperatures. Once the pipes are touching, the kinetic energy and cold energy will transfer between the molecules in the two pipes until both pipes reach the same temperature, which will be in between their starting temperatures.

Before the pipes touch, the front pipe is hotter than the back pipe. Once the pipes are touching, the cooler back pipe will gain kinetic energy until the molecules in both pipes have an energy of 100, because hotter things increase the temperature of cooler things.

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 decreases while the energy of the plate increases.

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

Its energy increases while the energy of the plate increases.

It is impossible to know without data on the number of molecules in each object.

Eric pours some iced tea into a glass. When he puts the iced tea in the glass, the energy of the glass decreases. What must be true of the energy of the iced tea?

Its energy increases while the energy of the glass decreases.

Its energy stays the same while the energy of the glass decreases.

Its energy decreases while the energy of the glass decreases.

It is impossible to know without data on the number of molecules in each object.

Jason put an apple on top of an ice pack in his lunch bag. By lunchtime the temperature of his apple had decreased. What happened to the molecules in the apple when the temperature of the apple decreased?

The energy of the molecules in the apple decreased.

The cold energy of the molecules in the apple increased.

The energy of the molecules in the apple increased.

A chocolate maker is going to stack two bars of chocolate. The bars of chocolate are the same size and have the same number of molecules. The diagram above shows the chocolate bars now, before they touch each other. Use the information in the diagram to answer the question. How does the temperature of the top chocolate bar compare with the temperature of the bottom chocolate bar now, and what will happen after the bars have been touching for a while?

Before the bars touch, the top bar is hotter than the bottom bar. Once the bars are touching, the top bar will transfer kinetic energy to the molecules in the cooler bottom bar until both bars reach the same temperature, which will be in between their starting temperatures.

Before the bars touch, the two bars are different temperatures. Once the bars are touching, both kinetic energy and cold energy will transfer between the molecules in the two bars until both bars reach the same temperature, which will be in between their starting temperatures.

Before the bars touch, the top bar is cooler than the bottom bar. Once the bars are touching, the bottom bar will transfer kinetic energy to the molecules in the cooler top bar until both bars reach the same temperature, which will be in between their starting temperatures.

Before the bars touch, the top bar is hotter than the bottom bar. Once the bars are touching, the cooler bottom bar will gain kinetic energy until the molecules of both bars have an energy of 25, because hotter things increase the temperature of cooler things.

When two molecules collide, kinetic energy transfers from...

faster moving molecules to slower moving molecules.

slower moving molecules to faster moving molecules.

the surrounding area into the system.

the potential energy within the molecule.

when all of the molecules in a system are moving at the same speed.

when all of the molecules in a system have the same amount of energy.

when all molecules are exactly the same

when all of the potential energy in the system has been converted into kinetic energy

The more molecules an object has...

the more thermal energy it has.

Stephen puts a hockey puck onto ice. After a while the temperature of the hockey puck decreases. What happens to the molecules of the hockey puck when the temperature of the puck decreases?

The energy of the molecules in the hockey puck decreases.

The hockey puck loses heat molecules.

The energy of the molecules in the hockey puck increases.

The cold energy of the molecules in the hockey puck increases.

Thermal Energy Review 2

Authored by Jennifer Zammit

Science

6th Grade

NGSS covered

Used 44+ times

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27 questions

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MULTIPLE SELECT QUESTION

45 sec • 1 pt

Molecules in a hotter sample will....

have more kinetic energy

be moving faster

be moving slower

be red in color

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Molecules move at the same speed no matter what the temperature.

true

false

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

There will always be heat transfer between two objects that are touching if...

the temperatures are the same in each sample

there is a difference in temperature between samples

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE SELECT QUESTION

45 sec • 1 pt

When will heat transfer stop?

When the molecules reach a state of equilibrium

When the molecules are moving at the same speed

When the kinetic energy is equal

When there is a phase change from liquid to gas

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Kinetic energy is the energy of...

electricity

potential movement

motion

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

NGSS.MS-PS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Energy will always be transferred from the...

hotter sample to the colder sample

colder sample to the hotter sample

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When hot and cold air make contact with each other...

the hot air will lose kinetic energy

cold air will lose kinetic energy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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Thermal Energy Review 2

Molecules in a hotter sample will....

Molecules move at the same speed no matter what the temperature.

There will always be heat transfer between two objects that are touching if...

When will heat transfer stop?

Kinetic energy is the energy of...

Energy will always be transferred from the...

When hot and cold air make contact with each other...

Energy transfers occur when....

When a hot and cold sample first come into contact with each other...

After these two samples achieve equilibrium the temperature will be 30.

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