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3.1 Particle Model of Matter - Coggle Diagram
3.1 Particle Model of Matter
Density
Mass per unit volume
ρ = m/v
Measured in kg/m3
States of Matter
Gases
Lowest Density
Particles can move freely
Most Kinetic Energy
Liquids
Particles can flow over each other
Solids
Particles can only vibrate about fixed positions
Highest Density
Least Kinetic Energy
Changes of State
Changes of state are physical changes
Internal Energy
The total kinetic and potential energies of the particles in a system
Mass is always conserved in changes of state
MELTING
Solid → Liquid
EVAPORATION
Liquid → Gas
CONDENSATION
Gas → Liquid
Physical Changes
If change is reversed the material’s properties can be recovered
Chemical Changes
Cannot easily recover its original properties
Sublimation
When a solid changes to a gas without becoming a liquid