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LEAP Thermal Energy Quick Assess

Last updated almost 2 years ago

5 questions

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Question 1

1.

The model shows a change in the thermal energy of a substance. Choose the statements that accurately describe the change represented in the model. ( choose 3 )

Temperature is decreasing as the kinetic energy slows down.

An increase in thermal energy changes a gas into a solid.

Particles speed up and spread out.

A gas changes into a liquid.

Thermal energy is being increased.

The particle motion decreased.

Question 2

2.

What causes bubbles to form in boiling water?

Water molecules (liquid) divide into smaller particles (gas) as thermal energy is added.

Thermal energy + water (liquid) forms a new substance (gas).

When liquid water is heated it creates carbon dioxide (gas) that creates bubbles.

Water molecules (liquid) change into water vapor (gas) as they gain kinetic energy.

Question 3

3.

Blue food coloring was added to each jar. Why does the blue dye spread more in the Hot Water jar?

The low kinetic energy in the water allows the high kinetic energy of the dye to spread.

Hot water has different molecules that allow the dye to spread out.

The fast moving water molecules have more kinetic energy to spread the dye around the container. 

The low thermal energy in the water allows the dye to move more freely.

Question 4

4.

The image shows how thermal energy moves between solids. The Red block has more thermal energy than the Blue block.
Which statement is NOT represented in this image?

Thermal energy moves from hot to cold.

Particles of a solid must touch for thermal energy to move.

Thermal energy moves between objects, until it becomes the same temperature.

The warm molecules move in one direction as the cooler molecules move in another direction, until they are balanced.

Question 5

5.

Why is there more condensation on the jar of cold water than on the jar of hot water?

Water vapor gets trapped by the gravity of the cold jar and sticks to the glass.

When water vapor in the air collides with the cold jar, the molecules lose thermal energy and become a liquid.

This is the same as clouds, thermal energy is increased and causes condensation on the outside of the jar.

Thermal energy causes the liquid water to be transmitted from the inside of the jar to the outside.