States of Matter! 8th Grade Science January 27-28, 2014 Ms. McKinley

What are “states” of matter??

¡ Matter is made of atoms and molecules that are ALWAYS moving.

¡ The motion of the atoms and molecules determine the STATE of matter (also called phase of matter).

¡ 4 different “states”

The particles in all MATTER move like this!! In random motion

4 states of matter

Solid

Liquid

Gas Plasma

We won’t study this one…

Solids

¡ FIXED shape

¡ FIXED volume

¡ Strong attractive forces keep the atoms close together

¡ Atoms vibrate in all directions

This is how the atoms in a SOLID are arranged. DRAW THIS J

Liquids ¡ No fixed shape. ¡ Takes the shape of the

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¡ FIXED volume

¡ Atoms are close together

¡ Attractive forces are weaker

¡ Atoms are free to slide past neighboring atoms

This is how the atoms in a LIQUID are arranged. DRAW THIS J

Gases ¡ No fixed shape

¡ No fixed volume ¡ Expands to fill volume of

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¡ Atoms are very far apart

¡ Very weak attractive forces between atoms

¡ Atoms move freely and collide into each other frequently

This is how the atoms in a GAS are arranged. DRAW THIS J