Solids, Liquids and Gases

What is a solid?

• particles that are tightly compacted

• particles that are not tightly compacted

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

what is a liquid?

• a substance that flows freely but is of constant volume

• a substance or matter in a state in which it will expand freely

• firm and stable in shape

Tags

NGSS.MS-PS1-4

what is a gas?

• a substance or matter in a state in which it will expand freely to fill the whole of a container

• the basic unit of a chemical element

• an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

NGSS.MS-PS3-4

How would you describe the way molecules move when the molecules are solid?

• the molecules are moving in place.

• the molecules are moving around each other.

• the molecules are moving away from each other.

• the molecules are not moving

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-4

Molecules are always moving no matter what phase they are in: solid, liquid, gas.

• True

• False

Tags

NGSS.MS-PS1-4

Solid, liquid and gas are examples of?

• phases
• temperature
• scale
• refute

Tags

NGSS.MS-PS1-4

A phase change can be observed at the molecular scale and can be explained at the macro-scale.

• True

• False

Tags

NGSS.MS-PS1-4

What happens to molecules when the temperature drops or lowers?

• The molecules get closer together

• The molecules start moving faster.

• The molecules stop moving.

• The molecules become smaller.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When a substance melts, the kinetic energy _____________.

• decreases
• stays the same
• increases
• decreases then increases

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What takes place when a solid changes to a liquid?

• condensation
• freezing
• melting
• evaporation

Tags

NGSS.MS-PS1-4