Phase Changes Key Concepts Practice

A _______ holds its shape and does not take the shape of its container.

• solid

• liquid

• gas

Tags

NGSS.MS-PS1-4

A _______ has no visible shape and fills its container.

• solid

• liquid

• gas

Tags

NGSS.MS-PS1-4

A _______ flows and can take the shape of its container.

• solid

• liquid

• gas

Tags

NGSS.MS-PS1-4

A _________ keeps its shape because its molecules only move in place, not around each other.

• solid

• liquid

• gas

Tags

NGSS.MS-PS1-4

A _______ can flow because its molecules move around, not away from each other.

• solid

• liquid

• gas

Tags

NGSS.MS-PS1-4

A ________ does not have a visible shape because gas molecules can move away from each other.

• solid

• liquid

• gas

Tags

NGSS.MS-PS1-4

A ​ (a)   is when the molecules that make up a substance experience a change to their freedom of movement. This involves a ​ (b)   -scale change in appearance.

• phase change
• chemical reaction
• macro
• micro
• molecular

Answer explanation

A phase change is not a chemical reaction. Chemical reactions require bonds to break and atoms to rearrange. Phase changes only require a change to the freedom of movement of a substance's molecules.

When a phase change happens, it can be seen with the naked human eye, which means that there is a macro-scale (large) change in appearance.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When _______ is transferred to or from a substance, it can change the molecules’ freedom of movement.

• energy

• matter

• temperature

• a chemical reaction

Answer explanation

In the Sim, you had to transfer energy in to increase molecular movement.

You had to transfer energy out to decrease molecular movement.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Kinetic means _________.

• movement

• heat

Thermal means _________.

• movement

• heat

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4