PLTW Energy

Solids have __________ freedom of movement than liquids.

• more
• less

A chef finds a sealed container consisting of an ingredient that goes into his restaurant’s secret sauce. The ingredient’s molecules are moving in place. What will happen if the chef causes the ingredient to change phase by transferring energy into it?

After the phase change, the ingredient’s molecules will move . . .

• faster, and the ingredient will be a solid.

• faster, and the ingredient will be a liquid.

• slower, and the ingredient will be a solid.

• slower, and the ingredient will be a liquid.

Tags

NGSS.MS-PS1-4

Gas molecules have ___________ freedom of movement than molecules of other phases.

• greater

• less

Tags

NGSS.MS-PS1-4

Joel and Micah were investigating a see-through container of water. Water can be a solid, liquid, or gas. At first, Joel and Micah said the water molecules were moving in place. Later , the water molecules were moving around each other. What change did they observe to the water?

• At first, the water was a gas. Later, it was a liquid.

• At first, the water was a liquid. Later, it was a solid.

• At first, the water was a solid. Later, it was a liquid.

• At first, the water was a liquid. Later, it was a gas.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The image above shows information about two different substances in sealed containers. A scientist transfers the same amount of energy into both substances. One substance changes phase, but the other does not. Which chemical changed phase, and why did it change?

• Substance A changed phase because its molecules were able to move fast enough to overcome the attraction between them. It is now a gas.

• Substance A changed phase because the weak attraction between its molecules allowed them move faster. It is now a gas.

• Substance B changed phase because the molecules were able to move fast enough to overcome the attraction between them. It is now a gas.

• Substance B changed phase because the strong attraction between molecules made their movement slower. It is now a solid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to particles when they are heated?

• They speed up and spread out
• They slow down and compress
• They stop moving
• They move closer together and speed up

Tags

NGSS.MS-PS1-4

A student left a jar of water outside his home. Water can be a solid, liquid, or gas. When he put the jar outside, the water was liquid. Twelve hours later, the water had changed phase and was a gas. What happened to the water molecules?

• When the student left the jar outside, the molecules were moving around each other. Later, the molecules were moving in place.

• When the student left the jar outside, the molecules were moving away from each other. Later, the molecules were moving around each other.

• When the student left the jar outside, the molecules were moving in place. Later, the molecules were moving around each other.

• When the student left the jar outside, the molecules were moving around each other. Later, the molecules were moving away from each other.

Tags

NGSS.MS-PS1-4

When molecules flow around each other, they are in this phase

• solid
• liquid
• gas
• plasma

Tags

NGSS.MS-PS1-4

A moving object has _________________ energy.

• kinetic

• potential

• electric

• wind

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What takes place when a gas changes to a liquid?

• melting
• freezing
• evaporation
• condensation

Tags

NGSS.MS-PS1-4