big ideas about phase change
DESCRIPTION
Notes about Phase Changes - evaporation, condensation, freezing and meltingTRANSCRIPT
Big Ideas about Phase Big Ideas about Phase ChangeChange
Phase changes happen...Phase changes happen...
• Between the three states of matter:Between the three states of matter:o Solid, Liquid and GasSolid, Liquid and Gas
• 4 Types of Phase Changes:4 Types of Phase Changes:MeltingMeltingFreezingFreezingEvaporationEvaporationCondensationCondensation
The key to starting a phase The key to starting a phase change....change....• HEAT!HEAT!• More Heat = More Kinetic EnergyMore Heat = More Kinetic Energy• More Kinetic Energy = More Particle Movement More Kinetic Energy = More Particle Movement
Particles and Kinetic EnergyParticles and Kinetic Energy
When particles have more When particles have more kinetic energy:kinetic energy:• more speedmore speed• hit other particles harderhit other particles harder• hit other particles more hit other particles more
often often • ExpandExpand
When particles have less When particles have less kinetic energy: kinetic energy: • less speedless speed• hit other particles less hit other particles less
and not as hardand not as hard• ContractContract
Let's Compare Phase ChangesLet's Compare Phase Changes
Melting - Solid to a Melting - Solid to a LiquidLiquid• Caused by heatCaused by heat• heat = kinetic energyheat = kinetic energy Evaporation- Liquid to a Evaporation- Liquid to a GasGas• Caused by heatCaused by heat• Heat = kinetic energyHeat = kinetic energy
Condensation - Condensation - Liquid to a GasLiquid to a Gas
• Caused by coolingCaused by cooling• Particles slow down & Particles slow down &
contractcontract Freezing - Liquid to a Freezing - Liquid to a SolidSolid• Caused by coolingCaused by cooling• Particles slow down & Particles slow down &
contractcontract
Melting
&
EvaporationCaused by heat---
Condensation
&
Freezing
Caused by cooling & contracting