Phase Change II

According to the molecular scale, how can molecules in a solid move?

• They can move apart

• They can move around each other

• They can move in place

• They cannot move at all

What is true about molecules when a substance changes state?

• Molecules disappear

• Molecules change size

• Molecules move differently

• Molecules become static

Tags

NGSS.MS-PS1-4

What can molecules in a liquid do?

• They can move in place

• They can move apart

• They can move around each other

• They cannot move at all

Tags

NGSS.MS-PS1-4

How do molecules in a gas behave compared to liquids and solids?

• They can move in place

• They can move around each other

• They can move apart

• They cannot move at all

Tags

NGSS.MS-PS1-4

A car mechanic had a sealed bucket containing a substance in the gas phase. She left the bucket outside over the weekend. When she returned, the substance had changed phase, and the substance was in the liquid phase. What happened to the molecules of this substance?

• Before the mechanic left, the molecules were moving away from each other. When she returned, they were moving around each other.

• Before the mechanic left, the molecules were moving around each other. When she returned, they were moving in place.

• Before the mechanic left, the molecules were moving around each other. When she returned, they were moving away from each other.

• Before the mechanic left, the molecules were moving in place. When she returned, they were moving around each other.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Scientists have a container of water. Water can be a solid, liquid or gas. At first, the water molecules in the container were moving around each other. Later, the water molecules were moving in place.

What change did the scientists observe in the water molecules in the container?

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

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

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

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

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What causes phase changes in matter?

• Temperature differences

• Energy transfers

• Chemical reactions

• Pressure changes

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What can cause a phase change in a substance?

• Only transferring energy into the substance

• Only transferring energy out of the substance

• Neither transferring energy into nor out of the substance

• Transferring energy into or out of the substance

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is affected by the change in kinetic energy of molecules during a phase change?

• The color of the substance

• The freedom of movement of the molecules

• The electrical charge of the molecules

• The number of molecules in the substance

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What happens to a substance when it is freezing or condensing?

• It heats up.

• Energy is transferred into the substance.

• It cools down.

• It gets hotter or warmer.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4