U1S1 Four States of Matter

Physical Science

What is a crystalline solid?

A solid whose atoms are arranged in a repeating pattern.

What does definite mean?

Unchanging; not likely to change.

What is a noncrystalline solid?

A solid whose atoms lack a particular pattern.

What is surface tension?

The result of water molecules pulling inwards with a strong attractive force.

What is viscosity?

A liquid’s resistance to flow.

How are atoms in a solid positioned?

They stay in a fixed position, have almost no freedom to move, and are held together by strong attractions.

How do atoms in a solid move?

They vibrate in place.

Where are atoms found in a crystalline solid?

In a repeating pattern called a crystal.

How are atoms arranged in a noncrystalline solid?

They have no particular order or pattern.

Do solids have a definite shape?

Yes, solids have a definite shape without needing a container.

Do solids have a definite volume?

Yes, solids have a definite volume.

Do liquids have a definite shape?

No, liquids take the shape of their container.

Do liquids have a definite volume?

Yes, liquids have a definite volume.

How are atoms in a liquid arranged?

They are closely packed but can slide past each other.

What determines the flow of a liquid?

Its viscosity; high viscosity flows slowly, low viscosity flows quickly.

Do gases have a definite shape or volume?

No, gases take both the shape and volume of their container.

How are atoms in a gas arranged?

They are far apart and move freely in all directions.

What is plasma?

A state of matter made up of charged particles with no definite shape or volume.

Where can plasma be found?

In stars, lightning, and some neon lights.