Phase Change Unit Review

The molecules in a solid

• move in place

• move around each other

• move away from each other

A liquid substance will

• expand and fill a container

• stay at the bottom of a container

• take the shape of a container

• keep its own shape in a container

Lily is doing a science experiment with a substance in a sealed jar. At first, the substance’s molecules are moving around each other. What will happen to Lily’s substance if she transfers energy into the substance and causes a phase change?

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

• faster, and the substance will be a liquid.

• faster, and the substance will be a gas.

• slower, and the substance will be a solid.

• slower, and the substance will be a liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the energy that an object has because it is moving?

• kinetic
• potential
• electric
• wind

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NGSS.MS-PS3-1

NGSS.MS-PS3-4

What happens to molecules when their kinetic energy decreases?

• They move slower.

• They move faster.

• They get heavier.

• It depends on the type of molecules.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

What takes place when a liquid changes to a gas?

• condensation
• melting
• evaporation
• freezing

Tags

NGSS.MS-PS1-4

When a substance melts, the kinetic energy _____________.

• decreases

• stays the same

• increases

• decreases then increases

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What takes place when a gas changes to a liquid?

• melting
• freezing
• evaporation
• condensation

Tags

NGSS.MS-PS1-4

What is the average kinetic energy of a substance called?

• volume
• temperature
• pressure
• movement

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When are the molecules in a substance moving?

• Only when the substance itself is moving

• They are always moving

• They are never moving

• When you shake the substance

Tags

NGSS.MS-PS1-4