NEW
Font size
WorksheetsThermal Energy Unit Review
Total questions: 21
Worksheet time: 42mins
What happens to molecules of a substance as its temperature increases?
hot molecules mix with cold molecules in the substance
the energy in the substance increases
the energy in the substance decreases
the cold energy in the substance decreases
What do the circles in the box represent?
objects
energy
atoms
molecules
What do the numbers in the circles represent?
objects
energy
atoms
molecules
What does the box around the circles represent?
an object
energy
atoms
molecules
The diagram in the image shows two pans before they touch each other. How does the temperature of the top pan compare with the temperature of the bottom pan?
the temperatures are the same
the top pan is hotter than the bottom pan
the bottom pan is hotter than the top pan
the bottom pan is cooler than the top pan
The diagram in the image shows two pans before they touch each other. What will happen after the pans have been touching for a while?
The bottom pan will transfer kinetic energy to the molecules in the top pan until both pans are the same temperature
The cooler top pan will gain kinetic energy until both pans have an energy of 70
The top pan will transfer kinetic energy to the molecules in the cooler bottom pan until both pans are the same temperature
Both kinetic energy and cold energy will transfer between the molecules in the two pans until both pans are the same temperature
The diagram in the image shows two pans before they touch each other. What will be the temperature of the pans after they have been touching for a while?
70
30
100
50
_____ is a balanced state in which a system is stable and energy will no longer transfer.
equilibrium
system
temperature
thermal energy
The diagram in the image shows two stacks of different pieces of plastic before they touch each other. After they have been touching for a while, which of the top plastic pieces will be cooler, and why?
The smaller plastic piece will be cooler because less energy has to transfer for the molecules to reach the same temperature
The larger plastic piece will be cooler because it started with more energy, so less energy had to be transferred for both plastics to reach the same total energy
The larger plastic piece will be cooler because the energy that transferred was spread out over more molecules
Both plastics will be the same temperature because both bottom plastics had the same amount of energy to transfer
What is the difference between the molecules of cold water and hot water?
The molecules of the hot water are moving and the molecules of the cold water are not moving
The molecules of the hot water are moving faster than the molecules of the cold water
The molecules of the cold water are moving faster than the molecules of the hot water
The molecules of the cold water are smaller than the molecules of the hot water
When water is put into a freezer, it cools down. What happens to the molecules of the water as its temperature decreases?
The energy of the molecules in the water decreases
The energy of the molecules in the water increases
The cold energy of the molecules in the water increases
The water loses heat molecules
The diagram in the image shows two wooden cubes before they touch each other. How does the temperature of the top cube compare to the temperature of the bottom cube?
The top cube is hotter
The top cube is cooler
The cubes are the same temperature
The cubes are different temperatures but have the same thermal energy
The diagram in the image shows two wooden cubes before they touch each other. What will happen when the cubes have been touching for a while?
The kinetic energy and cold energy will transfer between the molecules in the two cubes until both cubes reach the same temperature
The bottom cube will transfer kinetic energy to the top cube until both cubes reach the same temperature
The top cube will gain kinetic energy until the molecules in both cubes have an energy of 14
The top cube will transfer kinetic energy to the bottom cube until both cubes reach the same temperature
The diagram in the image shows two wooden cubes before they touch each other. After the cubes have been touching for a while, what will their temperatures be?
6
14
20
10
Jason put an apple on top of an ice pack in his lunch bag. By lunchtime, the energy of the ice pack had increased. What must be true of the energy of the apple?
the energy of the apple stays the same
the energy of the apple increased while the energy of the plate increased
the energy of the apple decreased while the energy of the ice pack decreased
the energy of the apple decreased while the energy of the ice pack increased
The diagram in the image shows two stacks of containers before the containers touch. After the top containers have been touching the bottom containers for a while, which top container will be cooler, and why?
Top Container 1 will be cooler than Top Container 2 because less energy has to transfer for the molecules to reach the same temperature as the molecules of the bottom container.
Top Container 2 will be cooler than Top Container 1 because it started with more total energy, so less energy has to transfer for both containers in the stack to reach the same total energy.
Top Container 2 will be cooler than Top Container 1 because the energy transferred to it is spread out over more molecules.
Both top containers will be the same temperature because both bottom containers have the same amount of energy to transfer.
Sam and Lyra are having sandwiches for lunch. Sam's sandwich was toasted, while Lyra's was not. Now Sam's sandwich has a higher temperature than Lyra's. What is the difference between the molecules of the two sandwiches?
There is no difference because both sandwiches are made of the same type of molecules
The molecules in Lyra's sandwich are smaller than the molecules in Sam's sandwich.
The molecules in Sam' sandwich are moving faster than the molecules in Lyra's sandwich.
The molecules in Lyra's sandwich are moving faster than the molecules in Sam's sandwich.
After a cup of coffee has been poured, the temperature of the coffee begins to decrease. What happens to the molecules in the coffee as its temperature decreases?
The kinetic energy of the of the molecules in the coffee decreases.
The cold energy of the molecules in the coffee increases.
The kinetic energy of molecules of the coffee increases.
The coffee loses heat molecules.
Virgi scoops some ice cream and puts it in a bowl. When she puts it in the bowl, the energy in the bowl decreases. What must be true about the energy in the ice cream?
Its energy stays the same while the energy in the bowl decreases.
Its energy increases while the energy in the bowl decreases.
Its energy decreases while the energy in the bowl decreases.
It is impossible to know without data on the number of molecules in each object.
Two pitchers of tea were left out on the counter. One pitcher was full of ice cold tea while the other was only half full of ice cold tea. After an hour, the half-full pitcher of tea was warmer than the full pitcher of tea. Which statement best explains why the half-full pitcher would be warmer?
A larger amount of energy was transferred to the same amount of matter.
A smaller amount of energy was transferred to the same amount of matter.
The same amount of energy was transferred to a smaller amount of matter.
The same amount of energy was transferred to a larger amount of matter.
Lance wants to keep his bottle of water cold, so he puts it in a cooler with an ice pack. He believes this will keep his water colder than if he just left it on his desk. Explain whether he is correct or incorrect.
Correct: Energy will transfer from the bottle of water to the ice, causing the water to get warmer.
Correct: Energy will transfer from the bottle of water to the ice, causing the water to get colder.
Incorrect: Energy will transfer from the ice to the bottle of water, causing the water to get warmer.
Incorrect: Energy will transfer from the bottle of water to the ice, causing the water to get warmer.
