UNIT 2 Changes in State

1.) Particle Arrangement The state (phase) of matter that we recognize is determined by 2 things. 1.) Particle Arrangement 2.) Temperature

By changing the temperature (energy) acting on a substance you can change the state (phase) of matter it is in.

State (Phase) Changes Melting Freezing Evaporation Condensation Sublimation

( candy bar in your pocket ) Melting When a solid changes into a liquid. * must increase the energy acting upon it ( candy bar in your pocket )

Freezing When a liquid changes into a solid. * must decrease the energy acting upon it ( water turning to ice )

Evaporation When a liquid changes to a gas. * must increase the energy acting upon it ( hand sanitizer )

( sweat on a drinking glass ) Condensation When a gas changes to a liquid. * must decrease the energy acting upon it ( sweat on a drinking glass )

( dry ice, or ice in a freezer) Sublimation When a solid changes into a gas without a liquid state. *can occur by increasing or decreasing the energy ( dry ice, or ice in a freezer)

Copy the Chart into your Notes.

L 1 5 4 2 S G 3

Heat of Fusion The amount of energy needed to turn a solid into a liquid. * changes with the material in the solid * how they extract metals out of rock

Heat of Vaporization The amount of energy needed to change a liquid into a gas. * changes with the material in the liquid * how they increase the concentration of a liquid in cooking

As faster moving particle escape, the energy of the remaining particles become less. * the temperature drops * cooling effect as water evaporates off your skin

Boiling When evaporation occurs throughout a liquid. * evaporation starts next to the heat source

The End