Def: Matter is anything that takes up space and has mass.

 

	Three States of Matter: Solid, Liquid and Gas.
	Iron (Fe) = Solid
	Water (H2O) = Liquid
	Oxygen (O2) = Gas

Properties
Solids	Liquids	Gases
Definite Shape Definite Volume Cannot be Compressed Cannot Flow Support from  below	No Definite Shape Definite Volume Cannot be   Compressed Can Flow Support from below and at sides	Can Flow Can be     Compressed No Definite Shape No Definite Volume Support from all directions

	When a gas spreads e.g. across a room, this is called diffusion.
	Priestley discovered oxygen.

 

Def: The melting point of a solid is the temperature at which a solid turns to a liquid.

Def: The boiling point of a liquid is the temperature at which evaporation occurs throughout a liquid.

Def: Sublimination is when a solid changes directly to gas when heated. E.g. Dry ice.

Def: Evaporation is the changing of a liquid to a gas.

 

	All matter (solids, liquids and gases) is made of particles (atoms and molecules)
	The particles that make up a solid are tightly packed. They cannot move but they can vibrate.

 

·        Whether a substance is a solid, a liquid or a gas depends on the freedom of movement of its particles.

 

Def: The temperature at which a solid changes to a liquid is its melting point

 

·        Brownian movement is important because it shows the existence and movement of particles.

 

Def: Brownian movement is the movement of pollen in water changing direction.