STATES OF MATTER & PHASE CHANGES

Particle Motion Solid – particles tend to move slowly (vibrate) and keep their shape Liquid – particles move freely and take the shape of their container Gas – particles move excitedly and fill all available space What misconceptions could be created by the model shown here of particles in a solid, liquid, gas, and plasma?

Argon Ice melting and sublimating at the same moment Phase Changes Transfer of thermal energy is required to change the state (or phase) of a substance Freezing/Melting Point Boiling/Condensation Point Argon Ice melting and sublimating at the same moment

Phase Graphs Show how TEMPERATURE changes over TIME can change the state (phase) of a substance. Temperature (y) vs. Heat/Time (x) Energy Exchange Causing a Rise in Temperature = POSITIVE SLOPE Energy Exchange Causing a Drop in Temperature = NEGATIVE SLOPE Energy Exchange Causing a Phase Change = SLOPE OF ZERO (FLAT)

Phase Graphs Phase changes occur at the: Freezing/Melting Point = Temp. where SOLID & LIQUID transition Boiling/Condensation Point = Temp. where LIQUID & GAS transition

Draw your own Phase Graph Label: Axes: y = Temperature, x = Heat Energy over Time Solid, Liquid, Gas Melting, Freezing, Boiling, Condensing Melting/Freezing Point, Boiling/Condensation Point Particle Motion (solid v. liquid v. gas)