1. Matter
Matter

2. Solids, liquids and gases
Matter

3. Solids, liquids and gases
Matter

4. In a state: Particles everywhere!
Solid: particles close together, vibrating in fixed places
Liquid: particles close together, but they can move past each other
Gas: particles far apart, moving quickly
Matter

5. Particle evidence Solids, liquids and gases expand when heated
Dye diffuses through liquid water
Smells diffuse through air
Matter

6. melting solid liquid freezing boiling liquid gas condensing
Changes
melting
solid liquid
freezing
boiling
liquid gas
condensing
Matter

7. Gases Air contains about 78% nitrogen and 21% oxygen
You need oxygen to live
Helium is a very light gas
Carbon dioxide is a heavy gas
You breathe out a bit more carbon dioxide than you breathe in
Matter

8. Dissolving Some chemicals dissolve in water
Some chemicals do not dissolve in water
Particles of the solid diffuse through the water
Heating speeds up dissolving
Stirring speeds up dissolving
Matter

9. particle liquid solid gas diffuse melt dissolve
Key words
particle
liquid
solid
gas
diffuse
melt
dissolve
freeze
melt
boil
condense
expand
shape
ice
contract
pour
squash
state
boiling point
melting point
Matter